Hi all,
Extremely long time listener but very few time poster.
I got a SMART error email yesterday from my home server with a 4 x 1Tb
RAID6. It basically boiled down to:
The following warning/error was logged by the smartd daemon:
Device: /dev/sdd [SAT], 1 Currently unreadable (pending) sectors
Device: /dev/sdd [SAT], 1 Offline uncorrectable sectors
This got me wondering so I ran a long test (smartctl -t long /dev/sdd)
and sure enough, after an hour or so I got this:
# 2 Extended offline Completed: read failure 50% 17465
1172842872
So, in the spirit of experimentation, I did the following:
# mdadm /dev/md2 --manage --fail /dev/sdd
# mdadm /dev/md2 --manage --remove /dev/sdd
# dd if=/dev/zero of=/dev/sdd bs=10M
# mdadm /dev/md2 --manage --add /dev/sdd
< a resync occurred here, afterwards >
# smartctl -t long /dev/sdd
< long wait >
# smartctl -a /dev/sdd
This is where it gets interesting. Although it originally logged an
error, I now see the following (with lots of other info trimmed):
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE
UPDATED WHEN_FAILED RAW_VALUE
4 Start_Stop_Count 0x0032 100 100 020 Old_age
Always - 154
5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail
Always - 0
9 Power_On_Hours 0x0032 081 081 000 Old_age
Always - 17493
12 Power_Cycle_Count 0x0032 100 100 020 Old_age
Always - 77
197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always
- 0
198 Offline_Uncorrectable 0x0010 100 100 000 Old_age
Offline - 0
Then even more interesting:
SMART Error Log Version: 1
No Errors Logged
SMART Self-test log structure revision number 1
Num Test_Description Status Remaining
LifeTime(hours) LBA_of_first_error
# 1 Extended offline Completed without error 00% 17489
-
# 2 Extended offline Completed: read failure 50% 17465
1172842872
This makes me ponder. Has the drive recovered? Has the sector with the
read failure been remapped and hidden from view? Is it still (more?)
likely to fail in the near future?
--
Steven Haigh
Email: netwiz@xxxxxxxxx
Web: http://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897
Fax: (03) 8338 0299
--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
