what type of mirroring are you using ? hardware or microsoft ware mirror ?

there will be an impack of the mirror building itself, best done over night.

Cheers

P

"Daniel Tan" wrote in message
news:6a6a9040.0307070816.7b91ee33@posting.google.c om...
> If i add another SCSI drive to my Windows NT 4 server would it able to
> perform mirroring and would it compromise the data processing speed ?
> Thanks.
>
> Regards,
> Daniel

On 7 Jul 2003 09:16:37 -0700, Daniel Tan wrote:
> If i add another SCSI drive to my Windows NT 4 server would it able to
> perform mirroring

Yes.

> and would it compromise the data processing speed ?

In some cases. Writes will be slower because the data has to be written
twice, rather than once. On SCSI, though, this shouldn't be too bad, unless
the drives are on the same channel. Reads, OTOH, will be faster, because
either drive can be used.

--
-- Skylar Thompson (skylar@os2.dhs.org)
-- http://os2.dhs.org/~skylar/

Skylar , what is OTOH ? so if SCSI drive on different channel will be
no problem to the write speed ? will it mirror everything including
the system file ? Thanks.

Daniel

Skylar Thompson wrote in message news:...
> On 7 Jul 2003 09:16:37 -0700, Daniel Tan wrote:
> > If i add another SCSI drive to my Windows NT 4 server would it able to
> > perform mirroring
>
> Yes.
>
> > and would it compromise the data processing speed ?
>
> In some cases. Writes will be slower because the data has to be written
> twice, rather than once. On SCSI, though, this shouldn't be too bad, unless
> the drives are on the same channel. Reads, OTOH, will be faster, because
> either drive can be used.

"Daniel Tan" schreef in bericht
news:6a6a9040.0307080713.72ced300@posting.google.c om...
> Skylar , what is OTOH ? so if SCSI drive on different channel will be
> no problem to the write speed ? will it mirror everything including
> the system file ? Thanks.

OTOH is short for On The Other Hand

On 8 Jul 2003 08:13:18 -0700, Daniel Tan wrote:
> will it mirror everything including the system file ? Thanks.

Yes. It is literally a mirror of the entire drive, including the boot
blocks and partition table (if you do it in hardware, at least).

--
-- Skylar Thompson (skylar@os2.dhs.org)
-- http://os2.dhs.org/~skylar/

Skylar, if the main disk data got corrupted, then the mirror disk also corrupted ?

Daniel

Skylar Thompson wrote in message news:...
> On 8 Jul 2003 08:13:18 -0700, Daniel Tan wrote:
> > will it mirror everything including the system file ? Thanks.
>
> Yes. It is literally a mirror of the entire drive, including the boot
> blocks and partition table (if you do it in hardware, at least).

On 11 Jul 2003 09:00:57 -0700, Daniel Tan wrote:
> Skylar, if the main disk data got corrupted, then the mirror disk also corrupted ?

In RAID 1, there is no "master" or "slave" drive; each drive is a peer to
the others. This means that data corruption is only a problem during
rebuilds, controller faults, and user errors. A drive problem will cause
the controller/OS to tag the drive as bad, and continue with the remaining
drive(s) in degraded operation until the drive is replaced.

--
-- Skylar Thompson (skylar@os2.dhs.org)
-- http://os2.dhs.org/~skylar/

Skylar, does mirroring related to RAID ? I do not have RAID controller installed.

Regards,
Daniel

Skylar Thompson wrote in message news:...
> On 11 Jul 2003 09:00:57 -0700, Daniel Tan wrote:
> > Skylar, if the main disk data got corrupted, then the mirror disk also corrupted ?
>
> In RAID 1, there is no "master" or "slave" drive; each drive is a peer to
> the others. This means that data corruption is only a problem during
> rebuilds, controller faults, and user errors. A drive problem will cause
> the controller/OS to tag the drive as bad, and continue with the remaining
> drive(s) in degraded operation until the drive is replaced.

On 13 Jul 2003 10:13:59 -0700, Daniel Tan wrote:
> Skylar, does mirroring related to RAID ? I do not have RAID controller installed.

You can use software RAID, in which the OS, CPU, and normal disk
controllers take the place of the RAID controller. If your controller
supports it, you can even do hot swapping with software RAID. Software RAID
(particularly RAID 5) tends to be somewhat slower than hardware RAID,
although some people have reported software RAID to be faster in pure
striping (RAID 0).

--
-- Skylar Thompson (skylar@os2.dhs.org)
-- http://os2.dhs.org/~skylar/