Re: ZFS TRIM support committed to HEAD.

----- Original Message ----- 
From: "Bob Bishop" <rb@gid.co.uk>
To: "Pawel Jakub Dawidek" <pjd@freebsd.org>
Cc: <freebsd-current@freebsd.org>; <freebsd-fs@freebsd.org>; "Steven Hartland" <killing@multiplay.co.uk>
Sent: Monday, September 24, 2012 3:17 PM
Subject: Re: ZFS TRIM support committed to HEAD.

> Hi,
> 
> On 23 Sep 2012, at 23:25, Pawel Jakub Dawidek wrote:
> 
>> I have a patch against stable/8, but not stable/9:
>> 
>> http://people.freebsd.org/~pjd/patches/zfstrim8.patch
> 
> Running with that in an otherwise 8-STABLE GENERIC amd64 kernel, I'm getting:
> 
> kstat.zfs.misc.zio_trim.zio_trim_bytes: 0
> kstat.zfs.misc.zio_trim.zio_trim_success: 0
> kstat.zfs.misc.zio_trim.zio_trim_unsupported: 0
> kstat.zfs.misc.zio_trim.zio_trim_failed: 2742
> 
> which doesn't look like it's working. The SSDs are:
> 
> ad4: 114473MB <ADATA SSD S510 120GB 3.3.2> at ata2-master UDMA100 SATA 3Gb/s
> ad6: 114473MB <ADATA SSD S510 120GB 3.3.2> at ata3-master UDMA100 SATA 3Gb/s
> 
> Any suggestions? Thanks

Don't think ad supports TRIM, switch to ada (ahci) and you should be good.

Although I'm surprised your seeing that many reported failures as it should
have disabled it on a pool level after the first few failures.

Is it still increasing?

    Regards
    Steve

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