[OmniOS-discuss] smartctl and SCT ERC on omnios
Andrew Kinney
andykinney at advantagecom.net
Fri Sep 30 22:52:34 UTC 2016
Hello,
I have a Samsung 845DC Pro SSD that I need to respond more timely during
problems with flash cells. We had an incident where it took 2 minutes to
fail a cell erase and bring in a spare cell, which is too long for a
redundant ZFS log device on a pool with a dataset with property
sync=always serving iSCSI volumes.
smartctl shows it supports SCT ERC:
# smartctl -x -d sat,12 /dev/rdsk/c4t0d0s0
smartctl 6.5 2016-05-07 r4318 [i386-pc-solaris2.11] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Device Model: Samsung SSD 845DC PRO 400GB
<snip>
ATA Version is: ACS-2, ATA8-ACS T13/1699-D revision 4c
SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
<snip>
SCT capabilities: (0x003d) SCT Status supported.
SCT Error Recovery Control
supported.
SCT Feature Control supported.
SCT Data Table supported.
<snip>
I should be able to read its current SCT ERC settings, but get an error:
# smartctl -l scterc -d sat,12 /dev/rdsk/c4t0d0s0
smartctl 6.5 2016-05-07 r4318 [i386-pc-solaris2.11] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org
SMART WRITE LOG returns COUNT and LBA_LOW register unchanged
SCT (Get) Error Recovery Control command failed
I would go read/write the scterc values on a different OS as a
workaround, but I've read that Samsung devices do not persist CCTL
values across reboots. At present, I don't know what it's set to or if
it's being honored.
It appears that this is a limitation of smartmontools on Solaris and its
derivatives.
Any ideas how I can read and set the scterc values on Omnios?
--
Andrew
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