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Re: With 4 disks should I go for RAID 5 or RAID 10
- From: Mark Mielke <mark(at)mark(dot)mielke(dot)cc>
- To: david(at)lang(dot)hm
- Cc: Florian Weimer <fw(at)deneb(dot)enyo(dot)de>, Fernando Hevia <fhevia(at)ip-tel(dot)com(dot)ar>, 'pgsql-performance' <pgsql-performance(at)postgresql(dot)org>
- Subject: Re: With 4 disks should I go for RAID 5 or RAID 10
- Date: Wed, 26 Dec 2007 16:59:45 -0500
david(at)lang(dot)hm wrote:
I could see a raid 1 array not doing consistancy checking (after all, it has no way of knowing what's right if it finds an error), but since raid 5/6 can repair the data I would expect them to do the checking each time.
Your messages are spread across the thread. :-)RAID 5 cannot repair the data. I don't know much about RAID 6, but I expect it cannot necessarily repair the data either. It still doesn't know which drive is wrong. In any case, there is no implementation I am aware of that performs mandatory consistency checks on read. This would be silliness.
Cheers, mark -- Mark Mielke <mark(at)mielke(dot)cc>
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