Best practices for SSD

[Chris Murphy]

On Feb 7, 2014, at 5:11 PM, Michael Cronenworth <mike at cchtml.com> wrote:

> On 02/07/2014 03:00 AM, sam tygier wrote:
>> 
>> Ubuntu will be using a cronjob that calls fstrim, not the discard mount option.
>> They found that the discard option cause a small performance hit.
>> https://blueprints.launchpad.net/ubuntu/+spec/core-1311-ssd-trimming
> 
> If you read the link you posted you will find that their discard testing is inconclusive. They only tested 2 SSDs.
> 
> The whole discard vs. fstrim debate is entirely speculation. I haven't seen any fs maintainer speak up on either side either. The debate has been limited to blog posters and vocal end-users with their opinions.

Well it's an old topic for them, you have to go back 3+ years, which is maybe not what you expect when only in the last few months some loud mouths on /. and Engadget shriek ZOMG Linux just now is getting TRIM?! And how basic this is on Windows and OS X (despite OS X only enabling trim for Apple branded SSDs).


Theodore T'so has spoken up on the ext4 list, as have others:
http://www.spinics.net/lists/linux-ext4/msg13071.html

Dave Chinner has said some things about it on the XFS list, as have others:
http://oss.sgi.com/archives/xfs/2013-07/msg00922.html

http://oss.sgi.com/archives/xfs/2011-05/msg00338.html

And there's a pile of discard/trim conversations on LKML, LVM, Btrfs, on and on.


Chris Murphy