F15 ext4 discard option - why not default?

Michał Piotrowski mkkp4x4 at gmail.com
Wed Mar 16 18:53:28 UTC 2011

2011/3/16 Thorsten Leemhuis <fedora at leemhuis.info>:
> On 16.03.2011 18:55, Ric Wheeler wrote:
>> On 03/16/2011 01:53 PM, Michał Piotrowski wrote:
>>> I installed F15 on SSD and I noticed that file systems are not mounted
>>> with discard option.
>>> Shouldn't "discard" option be enabled by default for SSD devices?
>> No - discard is off on purpose. Some SSD's work very well, others have
>> performance issues with discard and some even became unusable bricks.
>> The idea is to have it off by default so people can test. Over time, if things
>> go well, we can think about changing the default.
> That IOW and AFAICS means that we need a whitelist or a blacklist (or
> both) in the long term anyway, as those that become bricks won't simply
> vanish over night.


> So why not start with that now? Or is the answer simply a lack of
> resources/people interested to drive things forward?
> Just curious. I have a Intel SSDSA2M080G2GC for a while now but was not
> bold enough yet to give discard on Ext4 a try.
> Cu
>  knurd
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Best regards,


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