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Subject: Re: SCSI, U2W in particular?, and poor performance...
From: Wietse Venema (wietseporcupine.org)
Date: Sun Mar 05 2000 - 08:28:25 CST

Justin Robertson:
>
> Well, lets look at it this way, using the smtp-source program included in
> the distribution, the machine with the ide hardware managed to send 1000
> emails in 44 seconds.

Did you do the math? In order for me to spend more time on this
discussion you will have to demonstrate a minimal amount of clue.

        Wietse

> The machine (s) with scsi hardware took a few
> minutes to complete the same task. This is what rases my concern.
>
>
>
> Justin Robertson
> <zululinux.com>
>
> On Sat, 4 Mar 2000, Wietse Venema wrote:
>
> > Well let it be said that it is not possible to safely (*) create
> > 1024 files in 2 seconds on today's IDE disks with a non-journaling
> > file system. Doing so requires a multiple of 1024 disk updates in
> > different places (directory blocks, file blocks, inode blocks),
> > and disks just ain't that fast. At 10kRPM you have 3ms average
> > rotational latency. You can do the math.
> >
> > Wietse
> >
> > (*) safely as in: should someone pull the plug the files must not
> > be lost. In other words, Linux may have told you that the files
> > are on disk, but in reality they aren't. Use a real file system
> > for Postfix if you care about reliability.
> >
>
>
>