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Re: setting up raid10 with more than 4 drives

From: Stephen Frost <sfrost(at)snowman(dot)net>
To: Peter Childs <peterachilds(at)gmail(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: setting up raid10 with more than 4 drives
Date: 2007-05-30 10:42:36
Message-ID: 20070530104236.GW7531@tamriel.snowman.net (view raw or flat)
Thread:
Lists: pgsql-performance
* Peter Childs (peterachilds(at)gmail(dot)com) wrote:
> Good point, also if you had Raid 1 with 3 drives with some bit errors at
> least you can take a vote on whats right. Where as if you only have 2 and
> they disagree how do you know which is right other than pick one and hope...
> But whatever it will be slower to keep in sync on a heavy write system.

I'm not sure, but I don't think most RAID1 systems do reads against all
drives and compare the results before returning it to the caller...  I'd
be curious if I'm wrong.

	Thanks,

		Stephen

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