Date: Tue, 7 Jan 2014 01:41:20 -0000 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Miroslav Lachman" <000.fbsd@quip.cz> Cc: Karl Pielorz <kpielorz_lst@tdx.co.uk>, freebsd-geom@FreeBSD.org Subject: Re: Is TRIM working with gmirror? Message-ID: <41F7CA403B574953B72B6CF4D1DDE71D@multiplay.co.uk> References: <52A90049.7050001@quip.cz> <18C59233568D3A475FF0D843@study64.tdx.co.uk> <52CB2915.7060602@quip.cz> <7FBCC53840FA45928B9F527EA235B632@multiplay.co.uk> <52CB4C9E.3020904@quip.cz>
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----- Original Message -----
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>
Sent: Tuesday, January 07, 2014 12:38 AM
Subject: Re: Is TRIM working with gmirror?
> 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
> --------------
Unless you have a specific reason for using gmirror I would strongly
advise trying ZFS instead, it will definitely support TRIM in that
config and comes with a host of other benefits too :)
Regards
Steve
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