Date: Thu, 10 Feb 2000 14:13:37 -0800 From: Jon Rust <jpr@vcnet.com> To: <freebsd-questions@freebsd.org> Subject: Re: Vinum questions Message-ID: <v04210126b4c8ccdad900@[209.239.239.22]> In-Reply-To: <0ea901bf73fa$65c76d90$1e80000a@avantgo.com> References: <v04210123b4c8b1545f95@[209.239.239.22]> <0ea901bf73fa$65c76d90$1e80000a@avantgo.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Thanks for your input. I'm leaning toward RAID 0+1. But...
I built a RAID5 volume with the 4 drives as a test. newfs took a long
time, longer than I thought, so I decided to run some benchmarks.
iozone reported 2.7MBps. Seems kinda low. Looking through the
archives, I noticed Mr Lehey developed his own benchmark proggy
called rawio:
sudo rawio -a /dev/vinum/webr5
Doh! I forgot to run it on the raw device. Hit ctrl-c... bad plan.
The whole machine locked up. Even ctrl-alt-del wouldn't do anything.
Is this a problem with rawio, vinum, or vinum RAID5? Doesn't seem
like an interrupt signal should cause this type of problem.
jon
At 11:09 AM -0800 2/10/00, Scott Hess wrote:
>"Jon Rust" <jpr@vcnet.com>
>> My 2 choices:
>>
>> 1) Stripe and mirror. Gives 18G of storage, and best performance
>> that still has protection against drive failure. Not the most
>> efficient use of my drives, however.
>>
>> 2) RAID-5 all 4 of the drives in one volume. 27G of storage. Decent
>> performance. But... stability of RAID-5 in vinum?
>
>Make sure that RAID5 still meets your performance needs when rebuilding a
>drive. When we were deciding between RAID5 and RAID0+1 (on a hardware
>SCSI-SCSI controller), most of the performance tests came out reasonably
>close to each other - except when rebuilding a drive. There, RAID0+1 took
>a relatively minor hit, but RAID5 dropped our tps to 1/4 of the normal
>amount, meaning we couldn't rebuild a drive during peak usage.
>
>Later,
>scott
>
>
>
>
>To Unsubscribe: send mail to majordomo@FreeBSD.org
>with "unsubscribe freebsd-questions" in the body of the message
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?v04210126b4c8ccdad900>