Linux file system overhead - Ubuntu
This is a discussion on Linux file system overhead - Ubuntu ; I'm fairly new to Linux and am using Ubuntu 8.04 to create several servers
to hold my video and audio collection. In one of the servers I put 4 1
terabyte hard drives. I used the default of ext3 when ...
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Linux file system overhead
I'm fairly new to Linux and am using Ubuntu 8.04 to create several servers
to hold my video and audio collection. In one of the servers I put 4 1
terabyte hard drives. I used the default of ext3 when installing and now
have a system capacity of 1376.3 Gb available. Windows would yield 931 Gb
per drive or 3724 Gb. Seems that I'm losing quite a bit of space. Any
ideas?
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Re: Linux file system overhead
After takin' a swig o' grog, Jim belched out
this bit o' wisdom:
> I'm fairly new to Linux and am using Ubuntu 8.04 to create several servers
> to hold my video and audio collection. In one of the servers I put 4 1
> terabyte hard drives. I used the default of ext3 when installing and now
> have a system capacity of 1376.3 Gb available. Windows would yield 931 Gb
> per drive or 3724 Gb. Seems that I'm losing quite a bit of space. Any
> ideas?
Start with "man tune2fs".
You can also reformat with new settings.
Also, if you have a lot of files, check out other file-systems such as
reiserfs or xfs.
(Disclaimer: it is highly probable you'll get a better answer later from
someone else.)
--
This font is starting to come out very nicely
Knghtbrd: oh dear, are you hacking up another quake font in vi? 
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Re: Linux file system overhead
On Fri, 31 Oct 2008 08:53:51 -0700, Jim wrote:
> I'm fairly new to Linux and am using Ubuntu 8.04 to create several
Server or Desktop edition?
> servers to hold my video and audio collection. In one of the servers I
> put 4 1 terabyte hard drives. I used the default of ext3 when
> installing and now have a system capacity of 1376.3 Gb available.
Does the exact same machine with Windows see all four hard drives? If it
does, I have no explanation for the bulk of the missing space. That said,
by default ext3 reserves 5% of the volume for the superuser. Also, ext3
does not add and remove inodes automatically.
> Windows would yield 931 Gb per drive or 3724 Gb. Seems that I'm losing
> quite a bit of space. Any ideas?
You'd probably be better off to use a different file system with a server.
XFS and JFS are possibilities. Google, and even Wikkipedia are your
friends.
http://en.wikipedia.org/wiki/JFS_(file_system)
http://en.wikipedia.org/wiki/XFS
http://en.wikipedia.org/wiki/Comparison_of_file_systems
http://www.debian-administration.org/articles/388
--
Tony Sivori
Due to spam, I'm now filtering all Google Groups posters.
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Re: Linux file system overhead
Jim schreef:
> I'm fairly new to Linux and am using Ubuntu 8.04 to create several
> servers to hold my video and audio collection. In one of the servers I
> put 4 1 terabyte hard drives. I used the default of ext3 when
> installing and now have a system capacity of 1376.3 Gb available.
> Windows would yield 931 Gb per drive or 3724 Gb. Seems that I'm losing
> quite a bit of space. Any ideas?
You'll probably have to look at the used/free space per drive to figure
out what's wrong. Because wrong it is.
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Re: Linux file system overhead
On Fri, 31 Oct 2008 08:53:51 -0700, Jim wrote:
> I'm fairly new to Linux and am using Ubuntu 8.04 to create several
> servers to hold my video and audio collection. In one of the servers I
> put 4 1 terabyte hard drives. I used the default of ext3 when
> installing and now have a system capacity of 1376.3 Gb available.
> Windows would yield 931 Gb per drive or 3724 Gb. Seems that I'm losing
> quite a bit of space. Any ideas?
What does 'df' show when you've mounted them?
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Re: Linux file system overhead
On October 31, 2008 11:53, in alt.os.linux.ubuntu, Jim
(handyjh@frontiernet.net) wrote:
> I'm fairly new to Linux and am using Ubuntu 8.04 to create several servers
> to hold my video and audio collection. In one of the servers I put 4 1
> terabyte hard drives. I used the default of ext3 when installing and now
> have a system capacity of 1376.3 Gb available. Windows would yield 931 Gb
> per drive or 3724 Gb. Seems that I'm losing quite a bit of space. Any
> ideas?
As root, run dumpe2fs(8) ("man 8 dumpe2fs") and take a look at how you've
set up your ext3 filesystems.
Some things to note:
- the ext3 filesystem journal takes up space on the filesystem.
- some of the filesystem space is reserved for the superuser (usually
to permit root to log on and repair a "full" filesystem)
- the blocksize should be tuned to the average size of the files on the
fs. Too large a blocksize and you waste space. Too small, and you run
out of inodes.
Both the size of the journal and the amount of space reserved for the
superuser can be altered using tune2fs(8) ("man 8 tune2fs").
The blocksize can be altered, but only by reformatting the filesystem. If
you need to do that, back up the filesystem contents, mke2fs with the new
blocksize, and then restore the filesystem contents from the backup.
HTH
--
Lew Pitcher
Master Codewright & JOAT-in-training | Registered Linux User #112576
http://pitcher.digitalfreehold.ca/ | GPG public key available by request
---------- Slackware - Because I know what I'm doing. ------
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Re: Linux file system overhead
On Fri, 31 Oct 2008 08:53:51 -0700
"Jim" wrote:
> I'm fairly new to Linux and am using Ubuntu 8.04 to create several
> servers to hold my video and audio collection. In one of the servers
> I put 4 1 terabyte hard drives. I used the default of ext3 when
> installing and now have a system capacity of 1376.3 Gb available.
> Windows would yield 931 Gb per drive or 3724 Gb. Seems that I'm
> losing quite a bit of space. Any ideas?
Please post the output of "df -h" and "sudo fdisk -l".
--- Mike
--
My sigfile ran away and is on hiatus.
http://www.trausch.us/
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Re: Linux file system overhead
On Fri, 31 Oct 2008 12:56:20 -0400
Tony Sivori wrote:
> You'd probably be better off to use a different file system with a
> server. XFS and JFS are possibilities. Google, and even Wikkipedia
> are your friends.
I've lost data to bugs in the XFS filesystem code resulting in kernel
panics, so I have a strong distrust for that particular filesystem. I
use ext3 for all my servers presently, and once ext4 has had time to
see widespread usage and testing, I will probably move to that.
I've never used JFS, but why use it over ext3? A better question might
be "why not use ext3 on a server?"
--- Mike
--
My sigfile ran away and is on hiatus.
http://www.trausch.us/
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Re: Linux file system overhead
On Fri, 31 Oct 2008 16:24:39 -0400, Michael B. Trausch wrote:
> On Fri, 31 Oct 2008 12:56:20 -0400
> Tony Sivori wrote:
>
>> You'd probably be better off to use a different file system with a
>> server. XFS and JFS are possibilities. Google, and even Wikkipedia are
>> your friends.
>
> I've lost data to bugs in the XFS filesystem code resulting in kernel
> panics, so I have a strong distrust for that particular filesystem. I
> use ext3 for all my servers presently, and once ext4 has had time to see
> widespread usage and testing, I will probably move to that.
>
> I've never used JFS, but why use it over ext3? A better question might
> be "why not use ext3 on a server?"
I'm no expert. But given that ext3 wasn't performing well for the OP, it
seemed to me that after 15 minutes with Google, JFS and XFS were the best
alternate choices. I left out ReiserFS since it is not likely to be
further developed.
Assuming the info in the links I posted is correct, comparing ext3, JFS
and XFS: Ext3 results in the smallest post format disk capacity. Ext3 has
the smallest maximum file size limit. Ext3 has the smallest maximum volume
limit. Ext3 does not significantly outperform JFS or XFS in read or write
speeds, although performance does vary depending on the size of the file
in question.
--
Tony Sivori
Due to spam, I'm now filtering all Google Groups posters.
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Re: Linux file system overhead
On 2008-10-31, Jim wrote:
> I'm fairly new to Linux and am using Ubuntu 8.04 to create several servers
> to hold my video and audio collection. In one of the servers I put 4 1
> terabyte hard drives. I used the default of ext3 when installing and now
> have a system capacity of 1376.3 Gb available. Windows would yield 931 Gb
> per drive or 3724 Gb. Seems that I'm losing quite a bit of space. Any
> ideas?
>
You must have done something wrong, I have a server with a 5 TB ext3
partition (LVM over RAID 6).
--
Due to extreme spam originating from Google Groups, and their inattention
to spammers, I and many others block all articles originating
from Google Groups. If you want your postings to be seen by
more readers you will need to find a different means of
posting on Usenet.
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Re: Linux file system overhead
Tony Sivori wrote:
> I'm no expert. But given that ext3 wasn't performing well for the OP, it
> seemed to me that after 15 minutes with Google, JFS and XFS were the best
> alternate choices. I left out ReiserFS since it is not likely to be
> further developed.
Well, that certainly is an excellent reason, eh?
It is already "developed," works fine, and is probably better than all
of the others you mentioned.
You might as well have stated the reiserfs is no good because the person
it is named for is in prison for murder.
--
John
No Microsoft, Apple, AT&T, Intel, Novell, Trend Micro, nor Ford products were used in the preparation or transmission of this message.
The EULA sounds like it was written by a team of lawyers who want to tell me what I can't do. The GPL sounds like it was written by a human being, who wants me to know what I can do.
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Re: Linux file system overhead
On Fri, 31 Oct 2008 23:52:28 -0400, Tony Sivori wrote:
> I'm no expert. But given that ext3 wasn't performing well for the OP, it
> seemed to me that after 15 minutes with Google, JFS and XFS were the
> best alternate choices. I left out ReiserFS since it is not likely to be
> further developed.
I hear the original author of ReiserFS has plenty of free time to develop
and maintain it. The problem is he only sends out new versions of the
source code via snail mail.
stonerfish
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Re: Linux file system overhead
To the OP of this thread: Read the _very_last_ paragraph for what you
need to do to provide us information to help you; read the rest if
you're interested in the all the gory details.
On Fri, 31 Oct 2008 23:52:28 -0400
Tony Sivori wrote:
> On Fri, 31 Oct 2008 16:24:39 -0400, Michael B. Trausch wrote:
>
> >
> > I've lost data to bugs in the XFS filesystem code resulting in
> > kernel panics, so I have a strong distrust for that particular
> > filesystem. I use ext3 for all my servers presently, and once ext4
> > has had time to see widespread usage and testing, I will probably
> > move to that.
> >
> > I've never used JFS, but why use it over ext3? A better question
> > might be "why not use ext3 on a server?"
>
> I'm no expert. But given that ext3 wasn't performing well for the OP,
> it seemed to me that after 15 minutes with Google, JFS and XFS were
> the best alternate choices. I left out ReiserFS since it is not
> likely to be further developed.
>
Indeed on that last bit.
>
> Assuming the info in the links I posted is correct, comparing ext3,
> JFS and XFS: Ext3 results in the smallest post format disk capacity.
> Ext3 has the smallest maximum file size limit. Ext3 has the smallest
> maximum volume limit. Ext3 does not significantly outperform JFS or
> XFS in read or write speeds, although performance does vary depending
> on the size of the file in question.
>
A few notes: I use size qualifiers exactly; KB/MB/GB/TB = metric
measures (power-of-ten), KiB/MiB/GiB/TiB = CS measures (power-of-two).
Read carefully.[3] Also, sorry about the length of this post and the
grossly technical nature of it; if technical details bore ye, feel free
to move along. ;-)
Alright, then. Being that the max volume size for ext3 is 16 TiB (on
platforms where Linux uses a 4 KiB page size)[2] and the max file size
is 2 TiB, it's pretty much useful for nearly all but the largest types
of data storage configurations. The OP was mentioning that they were
trying to use 4 TB, which is well within that range. I am assuming
that they're using these 4 TB as a single logical partition spread
across the drives.
In order to see what the filesystem overhead is for a 4 TB drive, one
can use the qemu-img utility to create a sparse file that has a size
listed of 4,000,000,000,000 bytes and initially uses 0 bytes on-disk
(aside from its metadata, which is irrelevant to this example). (Note
that this will only work on an ext4 filesystem if you are using the ext
family; I am running on ext4, so I'll show by example.) I am using TB
in its literal metric size, as hard drives are not sold by power-of-two
measurements and have not been for a very long time. Size isn't
exact, so the numbers here will be "in the ballpark".
Also, note that 'du -B 1 FILE" will show the size on-disk of a
sparse file such as the one being used here; you can see the
*actual* filesystem overhead this way.
If you want to retrace my steps, verify my math and observations, and
so forth you need a filesystem that supports file sizes > 2 TiB. While
the file will _actually_ never consume more than 31.7 billion bytes,
the filesystem still has to be able to record a ~3.7 TiB/4 TB file
size. ext4 can do this; ext3 cannot, alas. So, run 2.6.28 or use
ext4dev in Intrepid on a partition that is 40GB or so to create this
file. To see the file's actual storage on-disk, use 'du -B 1
test-4tb.lmg' at the shell.
So, to find the default parameters, we run:
$ qemu-img create -f raw test-4gb.img 3906250000
(this creates the sparse file, 4 TB in size)
$ mkfs.ext3 -I 128 ./test-4gb.img
This shows us:
mke2fs 1.41.3 (12-Oct-2008)
test-4tb.img is not a block special device.
Proceed anyway? (y,n) y
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
244146176 inodes, 976562500 blocks
48828125 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
29803 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632,
2654208, 4096000, 7962624, 11239424, 20480000, 23887872, 71663616,
78675968, 102400000, 214990848, 512000000, 550731776, 644972544
(And the format will take a long time.) Now, let's run some
calculations. First, we know that an inode has a default size of 256
bytes on modern distributions. The OP is using Ubuntu Hardy, which has
e2fsprogs 1.40.8, with a modification by Ubuntu to make the default
inode size 128 bytes. So, unless the OP tells mkfs.ext3 to use 256
byte inodes, they will be 128 bytes in size, which is important to our
calculations.
So, there are 8,192 inodes (128 bytes each) for each block group, and
there are 29,803 block groups on disk. This comes out to
31,250,710,528 bytes of space which will be taken up by the inodes
(31.25 GB and change). This will support a maximum of 244,146,176
files on the volume. Whether or not this is a reasonable number of
files can only be determined by the OP, so I won't speculate there.
FYI, an inode contains the type of the file, permission information,
file size, and so forth. One file, one inode. So, on this 4 TB
volume, we can have a little over 244.1 million files, for an average
file size of 16,383.6 bytes per file. If you suspect that your
average filesize is going to be larger, and want to trim the overhead
of inode storage, you can decrease the number of inodes on your volume
by specifying a usage type (-T option to mkfs.ext3), by specifying the
bytes-per-inode (-i option to mkfs.ext3), or by specifying the number
of inodes directly (-N option to mkfs.ext3). Not surprisingly, the
default bytes-per-inode is 16,364 (you can find the default
in /etc/mke2fs.conf and adjust it for your system if need be).
Now, the next thing to look at which will deduct space from our
filesystem is the space reserved on-disk for the root user (or whatever
user/group is specified in the filesystem superblock). As can be seen
above, 48,828,125 blocks are reserved by default; this is 5% of the
disk space. Since the block size is 4,096 bytes, this means that the
amount of reserved space on this filesystem is going to be
200,000,000,000. This is 200 GB of space, which is *quite* a bit
excessive; we only really probably need 100 MB or so to be reserved for
when the disk is full, unless this filesystem is going to be holding
system logs which are expected to grow at an alarming rate. I would
suggest changing the reserved space to take up 25,600 blocks (say
"tune2fs -r 25600 /dev/DEVICE" after creating the filesystem; mkfs.ext3
doesn't let you specify the reserved space in blocks yet). You can
disable it *completely* by specifying "-m 0" to mkfs.ext3, or "-r 0" to
tune2fs on an existing filesystem if you judge that you do not need it
at all.
There is also a bit reserved for the "lost+found" directory that sits
in the root directory, 32 blocks worth (or 131,072 bytes of disk
space). This is used to create directory entries in lost+found and
exists as a protection measure against an out-of-space condition when
executing fsck on the partition; essentially the lost+found directory
has its directory entries pre-allocated for it to an extent.
In the default configuration, then, we've determined that there is a
total of 231.25 GB and change used/reserved at FS creation time. We can
reduce that to 31.25 GB and change very simply by just changing the
reserved space to statistically near zero (but large enough to still be
useful). There can be a bit more "invisible" usage depending on the
sizes of the files on the drive for indirect blocks, which are
pointers to additional data blocks for the file when the file grows
beyond a certain size, but the space they take is negligible.
The end result is that an empty filesystem, set up with the default
options, for 4 TB, is going to yield (4000GB - 231.25 GB), or 3768.75
GB. This is actually more space than the NTFS setup that the OP was
talking about.
Remember that filesystem we created in a sparse file above? Once it is
done formatting, it consumes with the command we used above, it
consumes 31,657,242,624 bytes on disk. This is slightly larger
(406,532,096 bytes larger, exactly) than the figure I indicated above
because it includes the journal (an extra 128 MiB), 21 copies of the
superblock and the original superblock (22 instances in total). The
data within the superblock takes 256 bytes[1], though it is stored in a
block, which means that it actually is in a 4,096 byte space. 22
copies, then, ties up 90,112 bytes of disk space. The remainder is
metadata for the block groups over and above the inodes (roughly 387.70
MiB - 128.00 MiB - 0.09 MiB, or ~259.61 MiB of additional overhead).
When mounted, it looks like:
$ df /mnt
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/loop0 3875472712 200836 3679959376 1% /mnt
$ df -h /mnt
Filesystem Size Used Avail Use% Mounted on
/dev/loop0 3.7T 197M 3.5T 1% /mnt
.... and after adjusting the reserved space to 25,600 blocks:
$ sudo umount /mnt
$ tune2fs -r 25600 ./test-4tb.img
tune2fs 1.41.3 (12-Oct-2008)
Setting reserved blocks count to 25600
$ sudo mount ./test-4tb.img -o ro,loop /mnt
$ df /mnt
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/loop0 3875472712 200836 3875169476 1% /mnt
$ df -h /mnt
Filesystem Size Used Avail Use% Mounted on
/dev/loop0 3.7T 197M 3.7T 1% /mnt
(For some reason, it did not update avail on the loop device; my /home
directory sees changes immediately when I issue them when it is
mounted, though; I am going to guess that loop devices don't see the
changes right away or maybe the fact that I mounted the filesystem
readonly means that it wasn't looking for the changes to be made.)
The OP says that after formatting, though, only 1.3 TB is available out
of a 4 TB file system? I can't calculate a way wherein there is 2.7 TB
overhead in the on-disk format, and the default format should yield
3.5 TiB (3,679,959,376 bytes/3.68 GB, give or take a few
thousands/millions of bytes for minor differences in the partition/hard
disk size)...
So as I posted earlier in response to the OP, the output of "df -h" and
"sudo fdisk -l" from the OP's system is necessary so that we can see
some more details. Also, if possible, use dumpe2fs which will dump
statistics about the filesystem to a text file which will be
approximately 8 megs for a ~4 TB filesystem. Compress that file with
gzip or bzip2, please, and upload it somewhere (and post a link) so
that we can see what the overall picture of the filesystem is.
--- Mike
[1] ext3_fs.h, around line 423: http://tinyurl.com/5m43ha
[2] http://lwn.net/Articles/187321/ (note, the FS does nowadays use an
unsigned integer which is why it can do 16 TiB these days,
ext3_fs.h says the __u32 type is used for blocks now)
[3] http://tinyurl.com/6njv2c
--
My sigfile ran away and is on hiatus.
http://www.trausch.us/
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Re: Linux file system overhead
On Fri, 31 Oct 2008 23:29:36 -0500
"John F. Morse" wrote:
> Tony Sivori wrote:
>
> > I'm no expert. But given that ext3 wasn't performing well for the
> > OP, it seemed to me that after 15 minutes with Google, JFS and XFS
> > were the best alternate choices. I left out ReiserFS since it is
> > not likely to be further developed.
>
> Well, that certainly is an excellent reason, eh?
See the LKML for reference, but there have always been issues
here-and-there re: ReiserFS 3. Hans, as the leader of Namesys, proved
to be a very cruddy maintainer of the ReiserFS 3 filesystem, often
failing to respond to bug reports and other quality issues in the
code. This was one of the main reasons that ReiserFS 4 was never
included in the mainline kernel.
To be completely fair, if Hans would have played ball with the other
kernel developers and not gotten angry or felt attacked when bugs were
filed and issues were brought up, and had been more responsive in
maintaining the filesystem, we'd probably have ReiserFS 4 as a quality
filesystem. But, ReiserFS in general sees less exposure to real life
stressful situations, and so there is implicitly less trust to be given
to it. In _this_ case, "not likely to be further developed" is a very
legitimate concern.
> It is already "developed," works fine, and is probably better than
> all of the others you mentioned.
I've only had a few issues using ReiserFS 3 in the past. I tested
ReiserFS 4 for a little while and experienced some data loss with it
(admittedly, I am _hard_ on filesystems). But I wouldn't argue that
either are better than ext3, which I have personally encountered no
issues with. ReiserFS 3 is fine for personal, light usage if you back
up your data regularly. I don't trust ReiserFS 4 at all, but also to
be fair, it's been _quite_ some time (about 2 or 3 years) since I've
bothered to patch a kernel to try to use it.
> You might as well have stated the reiserfs is no good because the
> person it is named for is in prison for murder.
That would only be a valid argument if nobody stepped up to maintain
ReiserFS in any capacity. Looking at the LKML, it doesn't appear as if
it _is_ actively maintained, even the in-kernel version. I'd expect
support for it in the mainline kernel to be dropped in the
near-to-mid-distant future if that situation doesn't change.
--- Mike
--
My sigfile ran away and is on hiatus.
http://www.trausch.us/
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Re: Linux file system overhead
Tony Sivori wrote:
>
.... snip ...
>
> --
> Tony Sivori
> Due to spam, I'm now filtering all Google Groups posters.
Note that, for unknown reasons, Google doesn't accept posts to
alt.os.linux.ubuntu.
--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]:
Try the download section.
-
Re: Linux file system overhead
jellybean stonerfish wrote:
> Tony Sivori wrote:
>
>> I'm no expert. But given that ext3 wasn't performing well for
>> the OP, it seemed to me that after 15 minutes with Google, JFS
>> and XFS were the best alternate choices. I left out ReiserFS
>> since it is not likely to be further developed.
>
> I hear the original author of ReiserFS has plenty of free time
> to develop and maintain it. The problem is he only sends out
> new versions of the source code via snail mail.
I understand he is in jail for murder. This may be apocryphal.
--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]:
Try the download section.
-
Re: Linux file system overhead
On Sat, 01 Nov 2008 20:26:08 -0500, CBFalconer wrote:
>
> I understand he is in jail for murder. This may be apocryphal.
http://www.sfgate.com/cgi-bin/articl...BAIQ12KT15.DTL
--
Tony Sivori
Due to spam, I'm now filtering all Google Groups posters.
-
Re: Linux file system overhead
On Fri, 31 Oct 2008 23:29:36 -0500, John F. Morse wrote:
> Tony Sivori wrote:
>
>> I'm no expert. But given that ext3 wasn't performing well for the OP,
>> it seemed to me that after 15 minutes with Google, JFS and XFS were the
>> best alternate choices. I left out ReiserFS since it is not likely to
>> be further developed.
>
>
> Well, that certainly is an excellent reason, eh?
If you say so. I only considered it to be a fair reason.
> It is already "developed," works fine, and is probably better than all
> of the others you mentioned.
I disagree that ReiserFS is superior to JFS and XFS.
That said, I used ReiserFS for years after ext3 let me down after an
abrupt power off. No complaints, except for the relatively slow mount
time. Since my computer has 16 partitions, and most were mounted at boot
time, ReiserFS did result in noticeably longer boot times.
> You might as well have stated the reiserfs is no good because the person
> it is named for is in prison for murder.
One might reasonably shy away from ReiserFS for that very reason. It
certainly is enough to give me mixed feelings about it. I certainly
wouldn't use it if Hans were to personally profit from it.
However, my concerns were more practical. No more bug fixes, no more
patches, no telling when the next Kernel update might break it, no more
development. That's reason enough, in my view, to not install ReiserFS.
--
Tony Sivori
Due to spam, I'm now filtering all Google Groups posters.
-
Re: Linux file system overhead
On Sat, 01 Nov 2008 04:38:36 -0400, Michael B. Trausch wrote:
> A few notes: I use size qualifiers exactly; KB/MB/GB/TB = metric
> measures (power-of-ten), KiB/MiB/GiB/TiB = CS measures (power-of-two).
> Read carefully.[3] Also, sorry about the length of this post and the
> grossly technical nature of it; if technical details bore ye, feel free
> to move along. ;-)
It is starting to look academic since the OP apparently has either found a
solution, given up, or is away from his usenet access.
> If you want to retrace my steps, verify my math and observations,
Oh, not really. I'm willing to take your word for it.
> The OP says that after formatting, though, only 1.3 TB is available out
> of a 4 TB file system?
That is the part that I found puzzling too. Perhaps he may have been
resizing partitions, and left a lot of space unformatted.
--
Tony Sivori
Due to spam, I'm now filtering all Google Groups posters.
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Re: Linux file system overhead
Tony Sivori wrote:
> On Fri, 31 Oct 2008 23:29:36 -0500, John F. Morse wrote:
>
>
>> Tony Sivori wrote:
>>
>>
>>> I'm no expert. But given that ext3 wasn't performing well for the OP,
>>> it seemed to me that after 15 minutes with Google, JFS and XFS were the
>>> best alternate choices. I left out ReiserFS since it is not likely to
>>> be further developed.
>>>
>> Well, that certainly is an excellent reason, eh?
>>
>
> If you say so. I only considered it to be a fair reason.
>
>
>> It is already "developed," works fine, and is probably better than all
>> of the others you mentioned.
>>
>
> I disagree that ReiserFS is superior to JFS and XFS.
>
> That said, I used ReiserFS for years after ext3 let me down after an
> abrupt power off. No complaints, except for the relatively slow mount
> time. Since my computer has 16 partitions, and most were mounted at boot
> time, ReiserFS did result in noticeably longer boot times.
I personally am not concerned about mount times (nor boot times).
Servers here, with uptimes exceeding two years.
How do you feel about the ReiserFS ability to handle many small files?
And ReiserFS's superior speed?
I do feel comfortable saying that ReiserFS, JFS and XFS are superior to
ext3 (another Novell blunder, eh).
--
John
No Microsoft, Apple, AT&T, Intel, Novell, Trend Micro, nor Ford products were used in the preparation or transmission of this message.
The EULA sounds like it was written by a team of lawyers who want to tell me what I can't do. The GPL sounds like it was written by a human being, who wants me to know what I can do.