On 2012-03-07 01:36, Mark Kirkwood wrote:
On 06/03/12 21:17, Yeb Havinga wrote:
One thing to note is that linux software raid with md doesn't support
discard, which might shorten the drive's expected lifetime. To get
some numbers I tested the raid 1 of ssd's setup for mediawear under a
PostgreSQL load earlier, see
http://archives.postgresql.org/pgsql-general/2011-11/msg00141.php
Right, which is a bit of a pain - we are considering either formatting
the drive with less capacity and using md RAID 1 or else doing the
mirror in LVM to enable a working discard/trim.
When I measured the write durability without discard on the enterprise
disks, I got numbers that in normal production use would outlive the
lifetime of the servers. It would be interesting to see durability
numbers for the desktop SSDs, even when partitioned to a part of the disk.
regards,
Yeb Havinga
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