Date: Tue, 07 Jan 2014 01:38:54 +0100 From: Miroslav Lachman <000.fbsd@quip.cz> To: Steven Hartland <killing@multiplay.co.uk> Cc: Karl Pielorz <kpielorz_lst@tdx.co.uk>, freebsd-geom@FreeBSD.org Subject: Re: Is TRIM working with gmirror? Message-ID: <52CB4C9E.3020904@quip.cz> In-Reply-To: <7FBCC53840FA45928B9F527EA235B632@multiplay.co.uk> References: <52A90049.7050001@quip.cz> <18C59233568D3A475FF0D843@study64.tdx.co.uk> <52CB2915.7060602@quip.cz> <7FBCC53840FA45928B9F527EA235B632@multiplay.co.uk>
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Steven Hartland wrote:
[...]
> Delete's are only support by CAM currently so if your device is
> not connected to a CAM based driver e.g. daX or adaX then its
> likely not getting through to the device.
It was mentioned in an original message:
mirror/gm1ssdp2 COMPLETE ada2p2 (ACTIVE)
ada3p2 (ACTIVE)
So disks are using CAM (devices ada2 + ada3, with ahci_load="YES" in
loader.conf)
# camcontrol devlist
..
..
<Samsung SSD 840 PRO Series DXM05B0Q> at scbus2 target 0 lun 0 (pass2,ada2)
<Samsung SSD 840 PRO Series DXM05B0Q> at scbus3 target 0 lun 0 (pass3,ada3)
> Not sure if this has been mentioned but you also need to have
> filesystem support, as your talking about gmirror I assume your
> using UFS which would need to be TRIM enabled using tunefs -t enable,
> see man tunefs for more info.
Gmirror and FS was created on testmachine with FreeBSD 9.2 with
following commands:
gmirror label -v -b load gm1ssdp2 ada2p2 ada3p2
newfs -U -L Rtzt0ssddb -t mirror/gm1ssdp2
And as WARNING message says, FS is flagged with TRIM support enabled:
--------------
WARNING: /ssd_db: TRIM flag on fs but disk does not confirm that it
supports TRIM
--------------
Thank you for your time anyway.
Miroslav Lachman
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