"Something is Wrong with /var Filesystem"

[frueyang]

hello, my workstation is HP B180L, and the version of OS is HPUX 10.20 .
Yesterday I found the /var filesystem can't be mounted. Then I perform a fsck operation
#
# fsck /dev/vg00/lvol8
vxfs fsck: file system had I/O error(s) on meta-data
log replay in progress
vxfs fsck: file system had I/O error(s) on meta-data
a full file system check is required
#

Then, I perform a full fsck.

#
# fsck -o full,nolog /dev/vg00/lvol8
vxfs fsck: file system had I/O error(s) on meta-data.
vxfs fsck: file system had I/O error(s) on meta-data.
pass0 - checking structural files
pass1 - checking inode sanity and blocks
vxfs fsck: fsck read failure bno = 154720, off=0, len=8192
#

What's the problem? What can I do?

[Balaji N]

that read error suggests could be a problem with your disk.

what does pvdisplay -v and lvdisplay -v see if there is something fishy.
also do a dd on the disk to see if all the blocks are readable.

hth
-balaji

[frueyang]

Thanks a lot!

However I'm not familiar with command 'dd',cound you tell me how to use command 'dd' if I want to save my data from /var at possible?

[Balaji N]

dd if= of=/dev/null bs=2048k

this is to just check if your disk has any bad sectors or if ur disk is completely readable. i guess you already have a backup. if not use, fbackup or tar.

-balaji

[Stefan Farrelly]

Ive had just this problem myself recently. After exhaustive checking the filesystem was lost, I had to newfs it. All data was lost.

The consensus was a hardware error developed on the disk which caused the corruption of your filesystem and its now lost. sorry.

[Ravi_8]

Hi,

did you do the fsck in single user mode or in multi user mode. advise you to do in single user mode.

can you check the disk with
#dd if=/dev/rdsk/cxtxdx of=/dev/null bs=1024k

if you get any I/O error then disk is in prolem

[shajitht_1 · Accepted solution]

HI
You can verify the file system using dd if=/dev/vg00/rlvol8 of=/dev/null bs=64k.

as per ur query u r notable to do fsck on the filesystem and hence not able mountit also . in this case you can try the following .

take backup of the file system using

dd if=/dev/vg00/rlvol8 of=/dev/rmt/0m bs=64k

(hope dat drive device is 0m)
create a new filesystem using newfs .

newfs /dev/vg00/rlvol8

now restore it from backup.

dd if=/dev/rmt/0m of=/dev/vg00/rlvol8 bs=64k

now do fsck on the same logical volume and try to mount it . but the chances are only 50%

regards

[Cheryl Griffin]

Stefan is correct, "I/O error(s) on meta-data" means filesystem corruption as the result of a hardware defect. You need to have the disks in vg00 checked.
Cheryl