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SCSI striped array failure

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4D View Drop Down
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    Posted: 17 January 2011 at 9:54pm
win2k
adaptec 3 channel card set to striped array mode
3 Scsi drives

one say fk you.

any clues

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Post Options Post Options   Thanks (0) Thanks(0)   Quote The Builder Quote  Post ReplyReply Direct Link To This Post Posted: 17 January 2011 at 10:04pm
Late and tired, but a striped array with no parity has no redundancy. Lose a drive, lose the data.
 
 
Unless I'm forgetting or the explanation is not as I read it.
 
Shagnasty will know this subject best...
It just is.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jonminns Quote  Post ReplyReply Direct Link To This Post Posted: 17 January 2011 at 11:09pm
Total loss i'm afraid unless there's some parity going on

This is where raid 5 wins


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Post Options Post Options   Thanks (0) Thanks(0)   Quote shagnasty Quote  Post ReplyReply Direct Link To This Post Posted: 17 January 2011 at 11:45pm
How failed is the drive, if you can get it to respin on another host adapter as a JBOD disk you may be able to plug it back onto the RAID card, load config from HDD and pull the data off.
Sometimes drives timeout on spin-up and get tagged shagged so removing all the physcial drives from the host, clear the array on host (flagged dead) and reconnecting all drives cause the HBA to reload config and if the disc spins up you could be able to lift the data.
 
I would do with a copy of Hiren's boot CD in the CDROM drive and a spare SATA or IDE HDD connected so you do pull the array back up you can instantly ghost the data to another drive...
 
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote The Builder Quote  Post ReplyReply Direct Link To This Post Posted: 18 January 2011 at 9:38am
Freezer trick comes to mind as well.
It just is.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jonminns Quote  Post ReplyReply Direct Link To This Post Posted: 18 January 2011 at 7:06pm
I've never had any success with the freezer
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mircea Bartic Quote  Post ReplyReply Direct Link To This Post Posted: 18 January 2011 at 9:02pm
tell me more about the freezer

I repaired computers on the side for about 9 years and didn't come across this method
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Post Options Post Options   Thanks (0) Thanks(0)   Quote The Builder Quote  Post ReplyReply Direct Link To This Post Posted: 18 January 2011 at 10:05pm
Works in two ways, bearing failure on a drive, or overheating controller chip on drive.
Sealed in a bag, put in freezer:
What little lubrication that is left on drive spindle gets thicker, ergo drive spins true. Also everything contracts, shrinks in effect.
Broken chip on drive may work as it's super cold.
 
Old 2003 Western Digitals, Maxtor and IBM's going click crash usually respond well.
I recon I get away with about 4 in 10 like this, in the case of bearing type failure hanging the cold drive on its cable and swinging it about can also help.
 
OBVIOUSLY use the drive as a slave, not a boot, and be quick.
 


Edited by The Builder - 18 January 2011 at 10:07pm
It just is.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mircea Bartic Quote  Post ReplyReply Direct Link To This Post Posted: 18 January 2011 at 10:08pm
interesting read

thanks
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