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тАО04-05-2008 06:38 PM
тАО04-05-2008 06:38 PM
We have a RAID 1 on an ML350 server, someone accidently erased the logical disk on the Smart Array 642 Controller setting during bootup and now there is no logical drive in the setting.
If we put in the 2 mirror HDD now and recreate the logical drive, does it mean all the data will be gone?
Just wondering if there is anyway we can recover the data?
This is very urgent and critical in our situation, please help and any input welcome.
Thanks.
Solved! Go to Solution.
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тАО04-06-2008 05:23 AM
тАО04-06-2008 05:23 AM
Re: Problem with Smart Array 642 & Raid 1 [URGENT]
I'm fairly certain that there's no way back.
Hopefully the someone who accidentally erased the logical disk, remembered to take a backup.
I'm intrigued how someone could do this. From what I recall, the warnings when you delete a logical disk are fairly clear.
Cheers,
Rob
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тАО04-06-2008 05:41 PM
тАО04-06-2008 05:41 PM
Re: Problem with Smart Array 642 & Raid 1 [URGENT]
For example, in my situation, 1 RAID controller with a single mirror, if the RAID controller goes faulty, even if I have a new card I still can't restore the data. I will have 2 useless mirror drives and everything will need to restore from backup.
So what's the point of fault tolerance in this case?
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тАО04-07-2008 04:57 AM
тАО04-07-2008 04:57 AM
Re: Problem with Smart Array 642 & Raid 1 [URGENT]
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тАО04-08-2008 04:04 AM
тАО04-08-2008 04:04 AM
Re: Problem with Smart Array 642 & Raid 1 [URGENT]
not sure if your last reply was still an attempt to recover your data or was it a general question on how to recover your data if a Controller goes faulty ?
If it is the latter, then there is no problem at all to recover the data because the array and logical disk information is written on the hard disks themselves, so this means that in case your controller needs to be replaced, the new controller will detect that he has no config and he will read the config from the disks and copy that into it's nvram and you'll have all data back, no problem.
What you could try to do in your case now where the raid1 array was deleted, is to re-create the mirror again with exact the same parameters (stripe size etc etc).
HTH
Kris
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тАО04-09-2008 02:55 AM
тАО04-09-2008 02:55 AM
Re: Problem with Smart Array 642 & Raid 1 [URGENT]
To e4services: I have tried this but seems like it doesn't work on the Smart Array 642..
TO Kris: I have taken Rob's advise to restore from backup but I was just very curious about the point of having this particular FT strategy.
I have read about the data is store on the HDD as well. But when I tried to put the mirror on the controller, it just can't read the data and the selection were either create a new logical disk or the HDD's are unusable.
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тАО04-09-2008 03:27 AM
тАО04-09-2008 03:27 AM
Re: Problem with Smart Array 642 & Raid 1 [URGENT]
in your scenario that is normal, in case of a controller failure, the metadata of the raid config is read into the 'new' controller and off you go, no data loss at all.
The Netraid from the Netservers days indeed works differently and allows better recovery in those cases since you can really skip the initialize step after simply re-creaing the array/logic drives.
Kris
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тАО04-09-2008 03:45 AM
тАО04-09-2008 03:45 AM
Re: Problem with Smart Array 642 & Raid 1 [URGENT]
And by that, in my case, if I really need to restore it, I can just put it onto a new controller and it should read from the HDD and all the data would still be available?
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тАО04-09-2008 04:45 AM
тАО04-09-2008 04:45 AM
SolutionSo you need to re-create the raid1 array in ORCA utility first (off line with F8 at bootup) or via the SmartStart cd and then follow the restore procedure for the type of backup you made.
Kris
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тАО04-10-2008 03:50 AM
тАО04-10-2008 03:50 AM
Re: Problem with Smart Array 642 & Raid 1 [URGENT]
Cheers
Martin