Re: With 4 disks should I go for RAID 5 or RAID 10 - Mailing list pgsql-performance

From Mark Mielke
Subject Re: With 4 disks should I go for RAID 5 or RAID 10
Date
Msg-id 4772CED1.2070808@mark.mielke.cc
Whole thread Raw
In response to Re: With 4 disks should I go for RAID 5 or RAID 10  (david@lang.hm)
Responses Re: With 4 disks should I go for RAID 5 or RAID 10
List pgsql-performance
david@lang.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@mielke.cc>

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