Date: Fri, 11 Aug 2000 16:45:39 -0700 (PDT) From: "Nicole Harrington." <nicole@unixgirl.com> To: Mike Smith <msmith@freebsd.org> Cc: hardware@FreeBSD.ORG, Mike Tancsa <mike@sentex.net> Subject: Re: 3ware and RAID0 vs RAID 1 Message-ID: <XFMail.000811164539.nicole@unixgirl.com> In-Reply-To: <200008112235.PAA00819@mass.osd.bsdi.com>
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Has anyone tested the Adaptec IDE RAID card?
After the dos config it is supposed to be faily OS independent.
Nicole
On 11-Aug-00 Mike Smith wrote:
>> >Ok, thanks. It *definitely* shouldn't "just hang" at all.
>>
>> OK, some more quick testing... I was wrong about the hanging, I just did
>> not wait long enough.
>
> That's a relief. I take it that you didn't look at the disks?
>
>> running bonnie with 100M (the machine has 128M of RAM, both complete in
>> about 30seconds. Actually, 33 for the 3ware vs 30. Sounds reasonable.
>> (mounts are sync btw)
>>
>> -------Sequential Output-------- ---Sequential Input--
>> --Random--
>> -Per Char- --Block--- -Rewrite-- -Per Char- --Block---
>> --Seeks---
>> Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec
>> %CPU
>> IDE 100 15511 84.5 16221 30.4 17630 33.8 13662 99.9 159587 99.9
>> 17239.3 99.7
>> RAID1 100 18210 97.4 18148 32.5 19653 36.0 13644 100.0 157095 100.0
>> 17101.5 99.6
>>
>>
>> But, when I do something over my available RAM, the differences become very
>> apparent.
>> -------Sequential Output-------- ---Sequential Input-- --Random--
>> -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
>> MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
>> IDE 500 17721 93.8 18197 33.4 8871 21.2 12800 97.5 22265 21.2 153.1 1.9
>> RAID1 500 14711 81.0 16023 32.0 600 1.4 5805 44.0 6710 6.0 102.2 1.3
>>
>> Doing a 500MB write on a regular drive on this machine takes about 3min,
>> 30seconds. On the RAID1, it takes 19 min ??
>
> Can you be more specific about "a 500M write"? Are you referring to the
> bonnie run? I wouldn't expect it to be 5x as slow. Note that the
> rewrite case suggests that your test is still too small; I typically use
> 1 or 10GB on a 128MB machine.
>
>> Do you see similar results with your controllers and disks in RAID1 ?
>
> Bonnie results on these cards tend to suggest that they're fairly slow
> writers. It's 3ware also observed this, but commented that with two
> writers they found more bandwidth. I suspect that the write overhead may
> be fairly high, leading to a lot of dead time while writing (the read
> overhead is also an issue I guess). I haven't done a lot of timing tests,
> as I'm typically more concerned with functionality and reliability.
>
>
>
> --
> ... 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]
>
>
>
>
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