I would imagine (or hope?) that when Mike does hdparm -I ${whatever disk} |
grep -i trim that he does not see "* Data Set Management TRIM supported
(limit 8 blocks)" unless it is supported by his kernel as well as the disk.


On Thu, Feb 14, 2013 at 6:19 PM, Chris Knadle <[email protected]>wrote:

> On Thursday, February 14, 2013 17:51:19, Ben Stoutenburgh wrote:
> > What version of 2.6. Apparently a lot of what you want to do got added to
> > 2.6.37,
>
> That's probably in the right ballpark.  Wikipedia mentions a couple of
> Linux
> versions concerning when TRIM support was added; they say "ATA TRIM" was
> added
> in 2.6.33, which includes SATA.
>
>    https://en.wikipedia.org/wiki/TRIM#Operating_system_support
>
>    reference [23] points to:
>
>    http://kernelnewbies.org/Linux_2_6_33#head-
> b9b8a40358aaef60a61fcf12e9055900709a1cfb
>
> > on RHEL 6 you are likely on 2.6.35.
>
> Linux kernel 2.6.32-279 according to:
>
>    https://en.wikipedia.org/wiki/Red_Hat_Enterprise_Linux#RHEL6
>
>      and:
>
>    https://access.redhat.com/knowledge/articles/3078
>
> However Red Hat are famous for doing a lot of backporting work, so it's not
> clear if their kernel supports discard / TRIM or not.
>
>   -- Chris
>
> --
> Chris Knadle
> [email protected]
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