Skip site navigation (1) Skip section navigation (2)

Re: SSD and RAID

From: Yeb Havinga <yebhavinga(at)gmail(dot)com>
To: Mark Kirkwood <mark(dot)kirkwood(at)catalyst(dot)net(dot)nz>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: SSD and RAID
Date: 2012-03-07 09:45:09
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
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 
> 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.

Yeb Havinga

In response to

pgsql-performance by date

Next:From: See Sing LauDate: 2012-03-07 17:49:23
Subject: Advice on Controller card for SAS disks
Previous:From: Mark KirkwoodDate: 2012-03-07 00:36:53
Subject: Re: SSD and RAID

Privacy Policy | About PostgreSQL
Copyright © 1996-2017 The PostgreSQL Global Development Group