Date: Thu, 23 Dec 2004 10:26:44 -0500 From: Mike Tancsa <mike@sentex.net> To: Igor Robul <igorr@speechpro.com>, freebsd-stable@freebsd.org Subject: Re: Poor performance with 3Ware 7506LP RAID Message-ID: <6.2.0.14.0.20041223101407.1053a0e8@64.7.153.2> In-Reply-To: <41CAB1A9.9040903@speechpro.com> References: <41CAB1A9.9040903@speechpro.com>
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At 06:53 AM 23/12/2004, Igor Robul wrote:
>Hello,
>we have performance problem with 3Ware 7506LP RAID5. For example if we
>execute rsync for large array of data, then
>'systat -vmstat' shows 100% load on twed0, and many other processes wait
>disk I/O.
>
>Also, which SATA RAID controller would you recomend for Samba/Courier-IMAP
>server for company with 80 users?
I think the 7xxx series is not so great for RAID5 speed wise. I know on
our 7810, its lucky to get 15MB/s on block writes on 6 160G
ST3160021A... I havent tested the 8xxx series in RAID5, but supposedly
they are faster as is the 9000. But I dont know about the stability of the
9xxx series drivers (twe vs twa). If speed and reliability is what you
want, look at RAID10. Our one mail server on RAID10 sees about 15-40
concurrent connections a second at peak times. With a lot of RAM and
Maildir format, there is hardly any blocking going on.
---Mike
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