SSD Partitioning OP/Trim recommendations

Chris Murphy lists at
Wed Dec 18 18:32:58 UTC 2013

On Dec 18, 2013, at 6:03 AM, Robert Moskowitz <rgm at> wrote:

> On 12/18/2013 04:41 AM, John Obaterspok wrote:
>> Hello,
>> I'm going to setup F20 with a new SSD disk (256gb Samsung 840 PRO) and was wondering about best practices for Over Provisioning during partitioning.
> hmmm.  I just ordered a Crucial M500 256GB SSD for my new install.  I thought I would have it all to work with (currently using a 320GB HD, so that is a 64GB reduction already).  Are you implying here that you need to not use all of the SSD drive so that it has some swap around?
> I chose the M500 over the 840 based on price and reviews.  The M500 uses MLC NAND compared to the 840 using TLC NAND.

FYI, be aware there appears to be a queued TRIM bug with the M500 where it may be causing silent data corruption. I wouldn't use discard on this, or any, SSD, in production until it's been well tested.

Until the industry gets its act together on TRIM, I think we're probably better off executing fstrim once a week with a cron job at a time the computer is likely to be idle.

Chris Murphy
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