Re: Samsung 830 and ZFS TRIM

Do you have any other disks in the machine if so its likely these are
the source of the unsupported increments.

    Regards
    Steve

----- Original Message ----- 
From: "Johannes Dieterich" <dieterich.joh_at_gmail.com>
To: <freebsd-current_at_freebsd.org>
Sent: Monday, November 26, 2012 7:48 PM
Subject: Samsung 830 and ZFS TRIM


> Hello,
> 
> (initially posted this to -questions_at_ a week ago, w/o reply)
> 
> I installed CURRENT on a new Thinkpad equipped with a Samsung 830 SSD:
> 
> ada0 at ahcich0 bus 0 scbus0 target 0 lun 0
> ada0: <SAMSUNG SSD 830 Series CXM03B1Q> ATA-9 SATA 3.x device
> ada0: 600.000MB/s transfers (SATA 3.x, UDMA6, PIO 8192bytes)
> ada0: Command Queueing enabled
> ada0: 122104MB (250069680 512 byte sectors: 1H 63S/T 16383C)
> ada0: Previously was known as ad4
> 
> as the setup is ZFS+GELI based (on ada0), I enabled ZFS TRIM support in 
> loader.conf.
> 
> Interestingly, I encounter an IMHO strange behavior with the stats on that:
> 
> kstat.zfs.misc.zio_trim.zio_trim_bytes: 755712
> kstat.zfs.misc.zio_trim.zio_trim_success: 97
> kstat.zfs.misc.zio_trim.zio_trim_unsupported: 7891
> kstat.zfs.misc.zio_trim.zio_trim_failed: 0
> 
> It seems unintuitive to me why the unsupported counter first increases 
> (seems to stay constant after that each boot) and then slowly the 
> success counter increases as well.
> 
> Probably there is a trivial explanation (GELI?) and/or fix for this that 
> anyone is willing to share?
> 
> If you need further information, let me know.
> 
> Thanks a lot
> 
> Johannes
> _______________________________________________
> freebsd-current_at_freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-current
> To unsubscribe, send any mail to "freebsd-current-unsubscribe_at_freebsd.org"
>

================================================
This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. 

In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337
or return the E.mail to postmaster_at_multiplay.co.uk.