30 messages in org.freebsd.freebsd-currentRe: A tool for remapping bad sectors ...| From | Sent On | Attachments |
|---|---|---|
| Eugeny N Dzhurinsky | Mar 8, 2010 2:26 am | |
| Alexander Motin | Mar 8, 2010 2:31 am | |
| Eugene Dzhurinsky | Mar 8, 2010 2:52 am | |
| Eugene Dzhurinsky | Mar 8, 2010 2:54 am | |
| Eugene Dzhurinsky | Mar 8, 2010 3:08 am | |
| Miroslav Lachman | Mar 8, 2010 3:21 am | |
| Wes Morgan | Mar 8, 2010 3:46 am | |
| Eugene Dzhurinsky | Mar 8, 2010 3:50 am | |
| Miroslav Lachman | Mar 8, 2010 5:28 am | |
| Alex Keda | Mar 8, 2010 12:14 pm | |
| Ulrich Spörlein | Mar 11, 2010 5:47 am | |
| Dag-Erling Smørgrav | Mar 11, 2010 7:20 am | |
| Svein Skogen (Listmail Account) | Mar 11, 2010 7:23 am | |
| Miroslav Lachman | Mar 13, 2010 12:44 pm | |
| Dag-Erling Smørgrav | Mar 13, 2010 1:24 pm | |
| Miroslav Lachman | Mar 14, 2010 1:54 am | |
| Gary Jennejohn | Mar 14, 2010 4:38 am | |
| Miroslav Lachman | Mar 14, 2010 9:18 am | |
| Gary Jennejohn | Mar 14, 2010 10:47 am | |
| Dag-Erling Smørgrav | Mar 17, 2010 3:58 am | |
| Miroslav Lachman | Mar 17, 2010 4:35 am | |
| Miroslav Lachman | Mar 17, 2010 4:41 am | |
| Dag-Erling Smørgrav | Mar 17, 2010 4:59 am | |
| Gary Jennejohn | Mar 17, 2010 5:05 am | |
| Miroslav Lachman | Mar 18, 2010 3:29 am | |
| Miroslav Lachman | Mar 18, 2010 3:32 am | |
| Dag-Erling Smørgrav | Mar 18, 2010 4:10 am | |
| Pieter de Goeje | Mar 18, 2010 4:33 am | |
| Miroslav Lachman | Mar 18, 2010 4:45 am | |
| Dag-Erling Smørgrav | Mar 18, 2010 5:17 am |
| Subject: | Re: A tool for remapping bad sectors in CURRENT? | |
|---|---|---|
| From: | Wes Morgan (morg...@chemikals.org) | |
| Date: | Mar 8, 2010 3:46:34 am | |
| List: | org.freebsd.freebsd-current | |
On Mon, 8 Mar 2010, Miroslav Lachman wrote:
Eugeny N Dzhurinsky wrote:
Hello, all!
Recently I've started to see the following logs in messages:
Mar 8 12:00:24 localhost smartd[795]: Device: /dev/ad4, 2 Currently unreadable (pending) sectors Mar 8 12:00:24 localhost smartd[795]: Device: /dev/ad4, 2 Offline uncorrectable sectors
smartctl did really show that something is wrong with my HDD, but still no remaps - just read errors.
SMART Self-test log structure revision number 1 Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error # 1 Extended offline Completed: read failure 60% 1198 222342559 # 2 Extended offline Completed: read failure 60% 1187 222342557 # 3 Extended offline Completed: read failure 60% 1180 222342559 # 4 Short offline Completed without error 00% 1178 - # 5 Extended offline Aborted by host 90% 1178 -
and
ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE ... Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail Always - 0 ...
Now can I find out which file owns the LBAs 222342557 and 222342559 ? How do I force remapping of these sectors? I assume that I have to write something directly to the sectors?
We have this problem from time to time on bunch of machines. As we are using gmirror, the easiest way is to force re-synchronization (rewrite) of the whole drive. The problem is when there are Pending unreadable sectors on both drives - it ends up with read error and some file(s) are corrupted, but there is no easy way (on FreeBSD) to find what file.
*cough* zfs *cough*
I believe this kind of silent corruption is precisely what zfs was designed to prevent. Even though you do have a mirror, how do you know which copy is the correct one? If one drive re-allocates the sector silently, what is the recovery method? If gmirror synchronizes, how do you make sure that the *good* copy is the one synchronized? You'll notice it eventually if you see it in a garbled file, but how does the filesystem handle it?
I tried it in the past with fsdb / findblk, but it does not work as I expect or I do not fully understand the needed calculations with slices + partitions offsets / LBAs and right meaning of the term "block". It seems there are several meaning in different contexts.
It would be nice if somebody with enough FS / GEOM knowledge can write some HowTo or shell script to do the calculations and operations to find file containing bad sector(s) and put it in FAQ, Handbook, or Wiki.
_______________________________________________ free...@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "free...@freebsd.org"