From owner-freebsd-current@freebsd.org  Fri Apr 15 07:49:37 2016
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Subject: Samsung SSD TRIM [Was: Heads up]
To: Warner Losh <imp@bsdimp.com>, Warren Block <wblock@wonkity.com>
References: <CANCZdfpnYnVrvhNagYUT9RhAuC1AMCrxh=GCt8RKT0bqxuJybw@mail.gmail.com>
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Cc: FreeBSD Current <freebsd-current@FreeBSD.org>
From: Andriy Gapon <avg@FreeBSD.org>
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Date: Fri, 15 Apr 2016 10:48:07 +0300
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On 15/04/2016 07:19, Warner Losh wrote:
> Samsung 830 all firmware
> Samsung 840 all firmware
> Samsung 850 all firmware
> 
> All of these are at least 18 months old (if not older). There's some
> confusing in Linux lists on
> the full impact of the Samsung drives (there was a bug in the Linux
> implementation (that can't
> be present in the FreeBSD implementation) that may have been the root cause
> for the Samsung
> black listing). Out of an abundance of caution, I've kept them in the list.

For what it's worth, I have been using the following SSDs since September of 2015 :

ada2: <Samsung SSD 850 EVO 120GB EMT01B6Q> ACS-2 ATA SATA 3.x device
ada3: <Samsung SSD 850 EVO 120GB EMT01B6Q> ACS-2 ATA SATA 3.x device

with ZFS with TRIM enabled and I haven't seen any problems thus far:

$ sysctl kstat | fgrep trim
kstat.zfs.misc.zio_trim.failed: 0
kstat.zfs.misc.zio_trim.unsupported: 2268
kstat.zfs.misc.zio_trim.success: 36895209
kstat.zfs.misc.zio_trim.bytes: 976003989504

Those disks are partitioned and host a small ZFS root / system pool plus log and
cache vdevs for other HDD-based pool.
So, I think that if the SSDs had any problem with TRIM I would have noticed it
by now.

-- 
Andriy Gapon