Eric Anderson wrote:
[...]
>> Hmmm...the time required is more dependent on inodes
>> than on size of data / size of files, right ?
>>
>> My 9 TB dataset uses about 36 million inodes.
>>
>> Any comments on that number ? Large ? Pedestrian ? Typical ?
>
>
> Sounds like you have a lot of larger files (~250k per file on average
> possibly), which helps the fsck times. 36 million inodes should be
> fsck'able with enough memory (maybe ~3gb ish? That's a wild guess). I
> have two 10Tb file systems, one has 180million inodes. I don't attempt
> to fsck it, because it would take a very long time, and I might possibly
> run out of memory (I have 8Gb of memory). I use GJOURNAL on these, and
> am very happy about it (thanks Pawel!).

How can I calculate required memory? Some time ago I have problems with
background fsck (snapshots?) on FreeBSD 6.0 with 1.2TB SCSI array
(kernel panic).
Then I set background_fsck="NO" and foreground fsck is running well. But
I don't know how much memory is needed for:
/dev/da1s1d 1132570308 514379258 561562536 48% 12456 146363222 0%
/array0

real memory = 2147401728 (2047 MB)
avail memory = 2096431104 (1999 MB)

# swapinfo
Device 1K-blocks Used Avail Capacity
/dev/da0s1b 4194304 0 4194304 0%

Can swap be used in time of fscking disc, or only "real" memory is used?

Miroslav Lachman

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