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Copied prtvtoc to original disk

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Operating Systems Solaris Copied prtvtoc to original disk
# 1  
Old 03-10-2016
Copied prtvtoc to original disk
Hi,
It is Solaris-10 with ZFS. c0t1d0 is original disk. c0t0d0 was faulty disk, which was replaced with new one and by mistake somebody ran opposite command
Code:
# prtvtoc /dev/rdsk/c0t0d0s0 | fmthard -s - /dev/rdsk/c0t1d0s0

Now rpool is in suspended state. Right now server is up, but allowing ssh connections only from console. Rebooting it may screw it more, so I want to take any action carefully. Can somebody give some pointer ?
Code:
# zpool status rpool 
 pool: rpool 
 state: SUSPENDED 
 status: One or more devices are faulted in response to IO failures. 
 action: Make sure the affected devices are connected, then run 'zpool clear'. 
 see: http://www.sun.com/msg/ZFS-8000-JQ 
 scan: none requested 
 config: 
  NAME STATE READ WRITE CKSUM 
 rpool UNAVAIL 171 39 0 experienced I/O failures 
 mirror-0 UNAVAIL 610 8 0 experienced I/O failures 
 c0t0d0s0 UNAVAIL 0 0 6 experienced I/O failures 
 c0t1d0s0 UNAVAIL 0 8 0 experienced I/O failures

# 2  
Old 03-10-2016
If you have a backup of the old vtoc, then restoring is still possible, and data becomes accessable again.
Perhaps you have another system with the same partitioning?
BTW we have a special system where we run a weekly prtvtoc backup:
Code:
# crontab -l | grep vtoc
50 23 * * 0 (/usr/sbin/prtvtoc /dev/dsk/c1t0d0s0;/usr/sbin/df -lk) > /partition_table

# 3  
Old 03-10-2016
Unfortunately that putty session was closed after changes, so we do not know, what was original vtoc. I am still trying to think hard, if there is another solution instead of restoring from backup, which will be a pain.
BTW, thanks for crontab entry. This is a good idea. Probably we can implement this, at least in production boxes.
Last edited by solaris_1977; 03-10-2016 at 06:44 PM..
# 4  
Old 03-10-2016
Another idea:
if you installed from opscenter you can lookup partitioning information there.
Might be unprecise though.
# 5  
Old 03-11-2016
As everything but the vtoc is still on disk, you might be able to rebuild the vtoc by analyzing the disk contents and searching for file system magic numbers.
# 6  
Old 03-11-2016
That is also good idea, which can work.
I got its explorer attached in a old Oracle SR. I pulled vtoc information from there and fixed it in failsafe mode. Now, it is good.
Thank you both of you.
# 7  
Old 03-12-2016
Quote:
Originally Posted by solaris_1977
Unfortunately that putty session was closed after changes, so we do not know, what was original vtoc. I am still trying to think hard, if there is another solution instead of restoring from backup, which will be a pain.
BTW, thanks for crontab entry. This is a good idea. Probably we can implement this, at least in production boxes.
Always a good idea to have putty take logs.
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