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Date:      Thu, 23 Dec 2004 11:41:06 -0800
From:      darren david <darren@3x3x3.org>
To:        Mike Tancsa <mike@sentex.net>
Cc:        freebsd-stable@freebsd.org
Subject:   Re: Poor performance with 3Ware 7506LP RAID
Message-ID:  <41CB1F52.2010800@3x3x3.org>
In-Reply-To: <6.2.0.14.0.20041223101407.1053a0e8@64.7.153.2>
References:  <41CAB1A9.9040903@speechpro.com> <6.2.0.14.0.20041223101407.1053a0e8@64.7.153.2>

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>> 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.

I'm running a 9500 on 5.3-STABLE with 4x250 RAID 5, performance is solid 
and it's totally stable. Can't say the same for the 3dm2 software, tho. 
Still no luck getting that up and running.

darren



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