partition can not open - urgent help

[babeo]

Hi
When there is an power outage and my unix boxes (1,2,3) reboot all of them. After that I just remount to connect the box 2 and 3 with 1. However, this time I can not mount because one of partition of box 1 has error and the system asks me to run fsck.

After I run fsck, here is the error:
"... Can't open the device /dev/rdsk/c0t1d0s7".

I would like to know what is that mean? Does it mean this partition is damaged and I lost all data? Is there anyway to fix or recover it?

Thanks

 

[Guest_imported]

Make sure the filesystem is unmounted. Try fsck -y -o b=32. This will attempt to use an alternate superblock to check against. I think I ran into an issue where I had to run fsck /dev/dsk/c0t1d0s7 instead of fsck /dev/rdsk/c0t1d0s7. Just a thought. There is always a restore from a backup.

 

[babeo]

Hi Sys Adm

Could you tell me more, specific with the sentence "I think I ran into an issue where I had to run fsck /dev/dsk/c0t1d0s7 instead of fsck /dev/rdsk/c0t1d0s7". What are the different between "dsk" and "rdsk" and what and where is my backup stored?

Thanks

 

[tuka]

On c0t1d0 do you only have slice s7? If you have other slices on that drive can you fsck those?
Does format show drive c0t0d0?
If you only have slice 7 then it looks like the drive went south during the power cycle.

 

[babeo]

Hi tuka

I did fsck, and it is automatically check other slices for me, I even rem out the bad slice c0t1d0s7 in vfstab and let the system check other slices.

- First I can not run format when I did not rem this out
- As the result, I have to rem it out and fsck then I can run format to see other slices, but I forget whether I see the slice c0t0d0 or not !! Will double check again (the box located at another location and there is not remote access to this box.)

- By the way, if the slice c0t1d0s7 is really died, it means I don't have any way to retrieve data back on it, right? !!!!

 

[tuka]

If you only have slice 7 on this disk then it is possible
that the disk had a spin up problem on the power cycle.
This problem could be the power for this drive isn't there
or stiction. For stiction you can remove the drive and do a couple of quick twists and hurriedly re-installed the drive.

Your /etc/vfstab should show what is being mounted.

 

[babeo]

Wow, what's a way. I shall try.
Thanks.