topic Re: file system corruption in Operating System - HP-UX

file system corruption

Roger Lavender — Thu, 07 Jun 2001 21:18:15 GMT

I have an hfs file system on a logical volume spanning two 4Gb disk. The file system is corrupt and when I do a fsck, I get two sets of "CANNOT READ: BLK..." in phase 1. In phase 5 I get "SUMMARY INFORMATION (INODE FREE) BAD \nBAD CYLINDAR GROUPS\nFIX?". When I type "y", I get file information then "DISK MEDIA PROBLEMS ENCOUNTERED!\nBAD BLOCKS WERE FOUND ON THE DISK.\nFILE SYSTEM IS NOT CLEAN -- DISK MEDIA PROBLEMS ENCOUNTERD". As per HP Tech support a "dd" of each disk to /dev/null was performed with no errors found. HP Tech support says that the drives are not in error. How can I get my data back?

Re: file system corruption

Steffi Jones_1 — Thu, 07 Jun 2001 22:28:38 GMT

Hi Roger,

if you have a backup then you could perform the following steps:

1) newfs the lvol
2) restore the data

Steffi Jones

Re: file system corruption

Paula J Frazer-Campbell — Fri, 08 Jun 2001 07:15:58 GMT

Hi Roger

If you can read any data I suggest that the first thing you do is backup what you can, then start to look at the fsck errors.

Do you have online jfs if so try a defrag it might clear the problem.

Paula

Re: file system corruption

Bill McNAMARA_1 — Fri, 08 Jun 2001 07:51:39 GMT

onlinejfs doesn't work with hfs!

You might want to dd the disk to another healhy disk and try to mount your fs from there... or set up lvm mirroring of the lvol to another healthy disk. Split mirror and mount the mirror split.

Later,
Bill

Re: file system corruption

Carsten Krege — Fri, 08 Jun 2001 08:41:41 GMT

You don't have a chance to repair a filesytem where fsck gives you "Cannot read block". If the disks are really healthy, you are perhaps dealing with a defective SCSI interface (which is very hard to diagnose and can give you all sort of symptoms).
I agree with Steffi's way to handle it, but would make sure that the filesystem is on a different disk and if possible on a different bus. Bill's suggestion can also work if this is really an underlying hardware failure.

Carsten

Re: file system corruption

Paula J Frazer-Campbell — Fri, 08 Jun 2001 09:15:39 GMT

Hi Bill

Its a RTFQ for me, I missed the HFS --Ooops.

Sorry Roger I'm typing rubbish.

((:-( Paula

Re: file system corruption

Bill McNAMARA_1 — Fri, 08 Jun 2001 09:19:53 GMT

yea, I do that all the time too Paula, especially near the next cap! ;)
There should be a delete answer button!!!

Bill