* Help tracking down files on a bad block: understanding the output of debugreiserfs
@ 2005-11-22 18:10 Dewey Sasser
2005-11-22 19:00 ` Konstantin Münning
0 siblings, 1 reply; 3+ messages in thread
From: Dewey Sasser @ 2005-11-22 18:10 UTC (permalink / raw)
To: reiserfs-list
Hello all,
I've recently received a bad block notice from SMARTD and I'm trying to
track down which files might be affected. I *think* I have the basic
process correct but I'm missing the final step -- how to get the inode
of the affected files. My skill with Google and man pages got me to
where I am but seems unequal to my remaining task.
My question is: is the inode of the file in question found in the
output of debugreiserfs -1 <blocknum> or is there some other way to get
the inode?
Attached is a console log documenting the process I'm using so far. How
should I interpret this output from debugreiserfs?
Many thanks,
--
Dewey Sasser
straits messages # grep LBAsect messages.1 | tail -n 1
Nov 9 09:45:34 straits hda: dma_intr: error=0x40 {
UncorrectableError }, LBAsect=32378944, sector=28250176
straits messages # fdisk -ul /dev/hda
Disk /dev/hda: 122.9 GB, 122942324736 bytes
255 heads, 63 sectors/track, 14946 cylinders, total 240121728 sectors
Units = sectors of 1 * 512 = 512 bytes
Device Boot Start End Blocks Id System
/dev/hda1 * 63 128519 64228+ 83 Linux
/dev/hda2 128520 4128704 2000092+ 83 Linux
/dev/hda3 4128705 240107489 117989392+ 5 Extended
/dev/hda5 4128768 43198784 19535008+ 83 Linux
/dev/hda6 43198848 240107489 98454321 83 Linux
straits messages # dc
32378944 /# LBA Sector/
4128768 /# Starting sector for hda5/
-
p
28250176 /# result: this is the sector within hda5/
8 /# convert 512 byte sectors to 4096 byte
ReiserFS blocks
/
/p
3531272 # /result: this is the ReiserFS block containing the
bad sector/
q
straits messages # debugreiserfs -1 3531272 /dev/hda5
debugreiserfs 3.6.19 (2003 www.namesys.com)
3531272 is used in ondisk bitmap
===================================================================
LEAF NODE (3531272) contains level=1, nr_items=12, free_space=632
rdkey (real items 12)
-------------------------------------------------------------------------------
|###|type|ilen|f/sp| loc|fmt|fsck|
key |
| | | |e/cn| |
|need| |
-------------------------------------------------------------------------------
| 0|3065513 2078685 0x0 SD (0), len 44, location 4052 entry count
65535, fsck need 0, format new|
(NEW SD), mode -rw-rw-r--, size 0, nlink 1, mtime 24/2005 04:17:29
blocks 0, uid 0
-------------------------------------------------------------------------------
| 1|3065513 2078685 0x1 DRCT (2), len 456, location 3596 entry
count 65535, fsck need 0, format new|
-------------------------------------------------------------------------------
| 2|3065513 2269255 0x0 SD (0), len 44, location 3552 entry count
65535, fsck need 0, format new|
(NEW SD), mode -rw-rw-r--, size 610, nlink 1, mtime 02/2005 04:05:49
blocks 8, uid 0
-------------------------------------------------------------------------------
| 3|3065513 2269255 0x1 DRCT (2), len 616, location 2936 entry
count 65535, fsck need 0, format new|
-------------------------------------------------------------------------------
| 4|3065513 2269421 0x0 SD (0), len 44, location 2892 entry count
65535, fsck need 0, format new|
(NEW SD), mode -rw-rw-r--, size 505, nlink 1, mtime 01/2005 14:35:40
blocks 8, uid 0
-------------------------------------------------------------------------------
| 5|3065513 2269421 0x1 DRCT (2), len 512, location 2380 entry
count 65535, fsck need 0, format new|
-------------------------------------------------------------------------------
| 6|3065513 2269440 0x0 SD (0), len 44, location 2336 entry count
65535, fsck need 0, format new|
(NEW SD), mode -rw-rw-r--, size 371, nlink 1, mtime 21/2005 14:35:50
blocks 8, uid 0
-------------------------------------------------------------------------------
| 7|3065513 2269440 0x1 DRCT (2), len 376, location 1960 entry
count 65535, fsck need 0, format new|
-------------------------------------------------------------------------------
| 8|3065513 2269513 0x0 SD (0), len 44, location 1916 entry count
65535, fsck need 0, format new|
(NEW SD), mode -rw-rw-r--, size 873, nlink 1, mtime 17/2005 16:06:08
blocks 8, uid 0
-------------------------------------------------------------------------------
| 9|3065513 2269513 0x1 DRCT (2), len 880, location 1036 entry
count 65535, fsck need 0, format new|
-------------------------------------------------------------------------------
| 10|3065513 2288540 0x0 SD (0), len 44, location 992 entry count
65535, fsck need 0, format new|
(NEW SD), mode -rw-rw-r--, size 643, nlink 1, mtime 09/2005 15:35:43
blocks 8, uid 0
-------------------------------------------------------------------------------
| 11|3065513 2288540 0x1 DRCT (2), len 48, location 944 entry count
65535, fsck need 0, format new|
===================================================================
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Help tracking down files on a bad block: understanding the output of debugreiserfs
2005-11-22 18:10 Help tracking down files on a bad block: understanding the output of debugreiserfs Dewey Sasser
@ 2005-11-22 19:00 ` Konstantin Münning
2005-11-22 20:22 ` Dewey Sasser
0 siblings, 1 reply; 3+ messages in thread
From: Konstantin Münning @ 2005-11-22 19:00 UTC (permalink / raw)
To: Dewey Sasser; +Cc: reiserfs-list
Hi!
Unfortunately I can't help you with the debugreiserfs output but maybe
with another approach for finding the correct blocknum of the bad
sector(s). Why don't you try
badblocks -b 4096 /dev/hda5
I'm not telling that your approach is wrong but this way (assuming your
reiserfs block is the default 4k) you'll be sure to have all bad blocks.
But it takes some time. On the other hand you may try this:
dd of=/dev/null if=/dev/hda5 bs=4k count=1 skip=xxx
with xxx the block number(s) of your calculation or output from
badblocks. Just to check if the block you've found is really unreadable.
How to identify the inode number corresponding to that block I can't
tell but finding the file etc. to the inode may be done with
find /mount-point-of-fs -inum xxx
where xxx is the inode number in question. See man find.
Hope that helps.
Konstantin
Dewey Sasser wrote:
> Hello all,
>
> I've recently received a bad block notice from SMARTD and I'm trying to
> track down which files might be affected. I *think* I have the basic
> process correct but I'm missing the final step -- how to get the inode
> of the affected files. My skill with Google and man pages got me to
> where I am but seems unequal to my remaining task.
>
> My question is: is the inode of the file in question found in the
> output of debugreiserfs -1 <blocknum> or is there some other way to get
> the inode?
>
> Attached is a console log documenting the process I'm using so far. How
> should I interpret this output from debugreiserfs?
>
> Many thanks,
>
> --
> Dewey Sasser
>
>
> straits messages # grep LBAsect messages.1 | tail -n 1
> Nov 9 09:45:34 straits hda: dma_intr: error=0x40 {
> UncorrectableError }, LBAsect=32378944, sector=28250176
> straits messages # fdisk -ul /dev/hda
>
> Disk /dev/hda: 122.9 GB, 122942324736 bytes
> 255 heads, 63 sectors/track, 14946 cylinders, total 240121728 sectors
> Units = sectors of 1 * 512 = 512 bytes
>
> Device Boot Start End Blocks Id System
> /dev/hda1 * 63 128519 64228+ 83 Linux
> /dev/hda2 128520 4128704 2000092+ 83 Linux
> /dev/hda3 4128705 240107489 117989392+ 5 Extended
> /dev/hda5 4128768 43198784 19535008+ 83 Linux
> /dev/hda6 43198848 240107489 98454321 83 Linux
> straits messages # dc
> 32378944 /# LBA Sector/
> 4128768 /# Starting sector for hda5/
> -
> p
> 28250176 /# result: this is the sector within hda5/
> 8 /# convert 512 byte sectors to 4096 byte
> ReiserFS blocks
> /
> /p
> 3531272 # /result: this is the ReiserFS block containing the
> bad sector/
> q
> straits messages # debugreiserfs -1 3531272 /dev/hda5
> debugreiserfs 3.6.19 (2003 www.namesys.com)
>
> 3531272 is used in ondisk bitmap
>
> ===================================================================
> LEAF NODE (3531272) contains level=1, nr_items=12, free_space=632
> rdkey (real items 12)
>
> -------------------------------------------------------------------------------
>
> |###|type|ilen|f/sp| loc|fmt|fsck|
> key |
> | | | |e/cn| |
> |need| |
>
> -------------------------------------------------------------------------------
>
> | 0|3065513 2078685 0x0 SD (0), len 44, location 4052 entry count
> 65535, fsck need 0, format new|
> (NEW SD), mode -rw-rw-r--, size 0, nlink 1, mtime 24/2005 04:17:29
> blocks 0, uid 0
>
> -------------------------------------------------------------------------------
>
> | 1|3065513 2078685 0x1 DRCT (2), len 456, location 3596 entry
> count 65535, fsck need 0, format new|
>
> -------------------------------------------------------------------------------
>
> | 2|3065513 2269255 0x0 SD (0), len 44, location 3552 entry count
> 65535, fsck need 0, format new|
> (NEW SD), mode -rw-rw-r--, size 610, nlink 1, mtime 02/2005 04:05:49
> blocks 8, uid 0
>
> -------------------------------------------------------------------------------
>
> | 3|3065513 2269255 0x1 DRCT (2), len 616, location 2936 entry
> count 65535, fsck need 0, format new|
>
> -------------------------------------------------------------------------------
>
> | 4|3065513 2269421 0x0 SD (0), len 44, location 2892 entry count
> 65535, fsck need 0, format new|
> (NEW SD), mode -rw-rw-r--, size 505, nlink 1, mtime 01/2005 14:35:40
> blocks 8, uid 0
>
> -------------------------------------------------------------------------------
>
> | 5|3065513 2269421 0x1 DRCT (2), len 512, location 2380 entry
> count 65535, fsck need 0, format new|
>
> -------------------------------------------------------------------------------
>
> | 6|3065513 2269440 0x0 SD (0), len 44, location 2336 entry count
> 65535, fsck need 0, format new|
> (NEW SD), mode -rw-rw-r--, size 371, nlink 1, mtime 21/2005 14:35:50
> blocks 8, uid 0
>
> -------------------------------------------------------------------------------
>
> | 7|3065513 2269440 0x1 DRCT (2), len 376, location 1960 entry
> count 65535, fsck need 0, format new|
>
> -------------------------------------------------------------------------------
>
> | 8|3065513 2269513 0x0 SD (0), len 44, location 1916 entry count
> 65535, fsck need 0, format new|
> (NEW SD), mode -rw-rw-r--, size 873, nlink 1, mtime 17/2005 16:06:08
> blocks 8, uid 0
>
> -------------------------------------------------------------------------------
>
> | 9|3065513 2269513 0x1 DRCT (2), len 880, location 1036 entry
> count 65535, fsck need 0, format new|
>
> -------------------------------------------------------------------------------
>
> | 10|3065513 2288540 0x0 SD (0), len 44, location 992 entry count
> 65535, fsck need 0, format new|
> (NEW SD), mode -rw-rw-r--, size 643, nlink 1, mtime 09/2005 15:35:43
> blocks 8, uid 0
>
> -------------------------------------------------------------------------------
>
> | 11|3065513 2288540 0x1 DRCT (2), len 48, location 944 entry count
> 65535, fsck need 0, format new|
> ===================================================================
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Help tracking down files on a bad block: understanding the output of debugreiserfs
2005-11-22 19:00 ` Konstantin Münning
@ 2005-11-22 20:22 ` Dewey Sasser
0 siblings, 0 replies; 3+ messages in thread
From: Dewey Sasser @ 2005-11-22 20:22 UTC (permalink / raw)
To: Konstantin Münning; +Cc: reiserfs-list
Konstantin Münning wrote:
> Hi!
>
> Unfortunately I can't help you with the debugreiserfs output but maybe
> with another approach for finding the correct blocknum of the bad
> sector(s). Why don't you try
>
> badblocks -b 4096 /dev/hda5
>
Interesting. When reading the badblocks man page I originally
interpreted something it said to mean that it wouldn't run against a
mounted partition. I see now that that is not the case. It will only
refuse to run doing tests which write the partition, which is as it
should be.
The partition affected is the root partition of a machine 700 miles from
my chair and there is no one near the box that had any kind of Linux
knowledge. I am therefore trying to do this as much "on-line" as
possible. I will run "badblocks" at some point but I'll still need a
way of mapping the bad block or sector to the affected files. (Yes, I
do have backups :)
> dd of=/dev/null if=/dev/hda5 bs=4k count=1 skip=xxx
>
> with xxx the block number(s) of your calculation or output from
> badblocks. Just to check if the block you've found is really unreadable.
>
That is indeed one of my additional questions -- does the fact that
debugreiserfs prints data mean the block (sector, really) is readable?
Or does it mean my math is incorrect. "badblocks" should help me answer
that question.
> How to identify the inode number corresponding to that block I can't
> tell but finding the file etc. to the inode may be done with
>
> find /mount-point-of-fs -inum xxx
>
Yep. That part I can handle. It's that middle link I'm missing :)
Thanks for your response,
--
Dewey
^ permalink raw reply [flat|nested] 3+ messages in thread
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2005-11-22 18:10 Help tracking down files on a bad block: understanding the output of debugreiserfs Dewey Sasser
2005-11-22 19:00 ` Konstantin Münning
2005-11-22 20:22 ` Dewey Sasser
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