Rebuild at RAID5?

In server with RAID 5 configuration, one of our harddisk is OFFLINE.
Does it mean harddisk failed, because we can make it ONLINE and it works, but it still no data when we check at Windows.
If we choose to REBUILD will it erase the datas?
isuhendroAsked:
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NopiusCommented:
> In server with RAID 5 configuration
You need to specify what kind of 'RAID5': hardware of software, then, if hardware, what vendor/device.

> Does it mean harddisk failed
Probably yes. Disk goes offline automatically when there are exessive errors in most RAID configurations.

> If we choose to REBUILD will it erase the datas?
If you rebuild RAID with 1 failed disk you loose data with high probabilty, regardless of what kind of RAID are you using.  Change disk first. Then tell us _where_ do you intend to do 'rebuild', in what program/utility (it depends on type of your raid).
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NopiusCommented:
One more note to "> Does it mean harddisk failed
Probably yes. Disk goes offline automatically when there are exessive errors in most RAID configurations."
If your disk failed your RAID should be in 'degraded' state. It might also be possible that disk doesn't belong to any RAID group and it may be just 'offline' itself.
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isuhendroAuthor Commented:
Hi Nopius,

Thanks for your answer. It's hardware RAID5, HP NetServer.
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NopiusCommented:
isuhendro, then  'REBUILD' is non destructive, but I recommend you to change drive to a good one first.
If you had configured spare and automatic rebuild before drave failure, then your array should be in 'good' state since all data already has been rebuild to spare. Then you need to change a drive.
If you had no spare or no auto rebuild, then just change a drive and start it manually.
More user documentation for all Netserver products is available from http://netserver.hp.com You may find your RAID installation/configuration manual there.
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isuhendroAuthor Commented:
hi Nopius,

we've finished the rebuild, all 4 harddisk are online now.. but still at Windows - Disk Management detect "Unknown" partition. Does it mean the data is gone? Is there any other way?

Thanks & regards.
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NopiusCommented:
> but still at Windows - Disk Management detect "Unknown" partition.
Do you mean it was 'Unknown' _before_ you started rebuild? If yes, than nothing changed, really... It should stay exactly the same as before.
It's possible that you have had double disk failure in raid5 _before_, then yes, your data is gone. Also it's possible that your partition table was corrupted with or without this failed disk. This issue is also indepentant of any raid configuration and then yes, your data is gone.

You may try to recover data (even from dead partitions) with any data recovery software that supports SCSI devices and your partition type (I guess NTFS). I may advice RTT R-STUDIO Data Recovery Software: http://www.r-studio.com/. It has a 'demo' version and you may try it if it's able to find files on your disk. It costs $50 for full version.
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isuhendroAuthor Commented:
hi Nopius,

it's true that before rebuild it was 'Unknown'.

now i'm trying to download r-studio. just wonder whether HP NetRaid Assistant also can do this kind of data recovery?
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isuhendroAuthor Commented:
Hi Nopius,

You're most helpful.

Thanks & regards.
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NopiusCommented:
isuhendro do you have any success with recovering data or everything is lost?
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