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Subject: Re: SCSI, U2W in particular?, and poor performance...
From: Justin Robertson (zululinux.com)
Date: Sat Mar 04 2000 - 22:02:04 CST

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. 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.
>