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Re: Re Raid 5+

From: <listmail_at_gennick.com>
Date: Thu, 31 Oct 2002 17:23:30 -0800
Message-ID: <F001.004F9573.20021031172330@fatcity.com>


On Thu, 31 Oct 2002 00:33:43 -0800, John Hallas wrote:

>We are certainly going to be performing extensive testing to ensure
>performance of our applications under Raid5+ is acceptable.
>
>That means it is as good if not better than that experienced under Raid1

I once threw my redo logs onto a RAID 5 array just for grins (while doing some preproduction testing before going live with a new database). The sysadmin and I saw a huge increase in disk activity, but that increase didn't translate into a negative impact on application performance. Who cares whether the poor disks are thrashing, so long as they are keeping up, right? Even so, we couldn't bring ourselves to leave the redo on RAID 5, so we moved it into RAID 0+1 before going live.

My point here is that you just might find performance to be acceptable.

Jonathan Gennick --- Brighten the corner where you are http://Gennick.com * mailto:jonathan@gennick.com * 906.387.1698

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Received on Thu Oct 31 2002 - 19:23:30 CST

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