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Mounting File System Problem

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David Dangerfield_1
Frequent Advisor

Mounting File System Problem

vxfs mount: read of super-block on /dev/vg01/lvol10 failed: I/O error

I get this when trying to mount the above lvol.
9 REPLIES
Pete Randall
Outstanding Contributor
Solution

Re: Mounting File System Problem

Have you tried to fsck it? It's worth a try. If fsck fails, then it's probably time to dig out the backup tapes.


Pete

Pete
David Dangerfield_1
Frequent Advisor

Re: Mounting File System Problem

tried doing a fsck and get

fsck: /etc/default/fs is used for determining the file system type
vxfs fsck: /wrk wrong file type
file system check failure, aborting ...
Torsten.
Acclaimed Contributor

Re: Mounting File System Problem

Is it vxfs for sure?

Then try

# fsck -F vxfs /dev/vg01/rlvol10

Hope this helps!
Regards
Torsten.

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David Dangerfield_1
Frequent Advisor

Re: Mounting File System Problem

Yes it is for sure. here is what we have in the fstab. File system had been working and we unmounted it and then when tried to remount it is when well bad things happened.

/dev/vg01/lvol10 /wrk vxfs rw,suid,nolargefiles,delaylog,datainlog 0 2

Bill Hassell
Honored Contributor

Re: Mounting File System Problem

> vxfs mount: read of super-block on /dev/vg01/lvol10 failed: I/O error

"I/O error" is the keyword: your disk has a bad spot on it. You should some disk error messages in syslog. fsck cannot fix any I/O error -- it is a tool to sort out missing or incorrect pointers and entries in the directory. So all the errors you see (such as invalid filesystem) are due to the disk error. In this case, you'll need to replace the disk and if not mirrored, get out your backup tapes.

There is one cornercase that will also give an I/O error -- lvol10 was reduced in size. Without the latest online JFS code, lvreduce will damage the filesystem. If you know that lvreduce was done, run lvextend to try to put back the missing portions of the filesystem.


Bill Hassell, sysadmin
Ganesan R
Honored Contributor

Re: Mounting File System Problem

Hi David,

try fsck -F vxfs -o full /dev/vg01/rlvol10

But i also suspect some bad blocks on the underlying disk. check the integrity of the disk with dd.

#dd if=/dev/dsk/cxtxdx of=/dev/null bs=1024k
Best wishes,

Ganesh.
SKR_1
Trusted Contributor

Re: Mounting File System Problem

Try

fsck -F vxfs -o full -o nolog -y /dev/dsk/rlvol6

Thanks
SKR
ajin
Frequent Advisor

Re: Mounting File System Problem

David Dangerfield_1
Frequent Advisor

Re: Mounting File System Problem

Reolace drive and restored items from tape.
thanks to all for help