From owner-freebsd-geom@FreeBSD.ORG  Wed Jul 24 08:08:36 2013
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Date: Wed, 24 Jul 2013 09:08:30 +0100
From: Karl Pielorz <kpielorz_lst@tdx.co.uk>
To: freebsd-geom@FreeBSD.org
Subject: TRIM or no TRIM?
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Hi,

I've got a 9.1-RELEASE-p4 amd64 system, on a SuperMicro board with:

ahci0: <Intel ICH8 AHCI SATA controller> port 
0xf070-0xf077,0xf060-0xf063,0xf050-0xf057,0xf040-0xf043,0xf000-0xf01f mem 
0xdfa22000-0xdfa227ff irq 19 at device 31.2 on pci0

I'm using a graid RAID1 array comprising of two INTEL SSDSA2CW160G3's with 
a couple of file systems on it.

I've used 'fsck_ffs -E' on the filesystems, rebooted as single user and 
done 'tunefs -t enable' for both file systems.

On a subsequent reboot I get:

"
WARNING: /: TRIM flag on fs but disk does not confirm that it supports TRIM
WARNING: /usr3: TRIM flag on fs but disk does not confirm that it supports 
TRIM
"

Is TRIM supported on this configuration? - Is there any way of telling if 
it's actually working?

Thanks,

-Karl