Date: Sun, 4 Feb 2001 17:33:16 -0800 (PST) From: Tom Samplonius <tom@sdf.com> To: Mike Smith <msmith@freebsd.org> Cc: freebsd-scsi@freebsd.org Subject: Re: Tags and the mly driver Message-ID: <Pine.BSF.4.05.10102041724530.11446-100000@misery.sdf.com> In-Reply-To: <200102050210.f152AUc01543@mass.dis.org>
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On Sun, 4 Feb 2001, Mike Smith wrote:
...
> I've recently fetched all my controllers back out of storage, so with any
> luck, I'll be able to post a followup to this in a little while with a
> better answer for you.
It is not hard to replicate. I happen to be using a RAID volume with 3
x 18GB disks. "camcontrol tags da0" says that there is only one opening.
Setting the openings to 4 ("camcontrol tags da0 -N 4") and do a bit of
heavy IO, and it will be hung within a minute.
I'm doing this on a 4.2-STABLE system. P3-1000, 512MB of RAM, Mylex
AccelRAID 352 with 64MB of cache.
I will post some postmark results of a AccelRAID 250 vs. AccelRAID 352
on Monday. Even though the 250 only uses Ultra 2, has a slowish
processor, and 16MB of cache, it is consistantly faster that the AccelRAID
352. Each was using a single RAID1 volume. The 352 was connected to
faster disks though.
> Regards,
> Mike
>
>
> --
> ... every activity meets with opposition, everyone who acts has his
> rivals and unfortunately opponents also. But not because people want
> to be opponents, rather because the tasks and relationships force
> people to take different points of view. [Dr. Fritz Todt]
> V I C T O R Y N O T V E N G E A N C E
Tom
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