Re: SSD and RAID

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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


--
Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-performance


[Postgresql General]     [Postgresql PHP]     [PHP Users]     [PHP Home]     [PHP on Windows]     [Kernel Newbies]     [PHP Classes]     [PHP Books]     [PHP Databases]     [Yosemite]

  Powered by Linux