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Raid 5 - how do i find bad drive?

post #1 of 21
7/31/09 at 8:13am
Thread Starter 
I am helping a guy fix his RAID5 setup, he has 8 250GB drives in raid5 for a total of around 1.5TB. One of them has gone bad though and his raid config says that the 5th harddrive is empty, but when i view the drives it shoes the 6th harddrive as red, where as the rest are green. Is the 5th harddrive bad because it says empty, and the others dont, or is the 6th one bad because it is displayed in red (no error messages, it is just red). How do i repair the array once i have replaced the correct harddrive? Does it do this on its own or do i need to do something?

He has a PCI raid card for his SATA harddrives, but i couldnt find the model number. His PC uses linux and i have no idea how to use it. i am hoping to fix everything with the raid controller tool in the bios.

Thanks everyone, rep+ as usual
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post #2 of 21
7/31/09 at 8:15am
Are there any diagnostic tools in the RAID utility you could try to determine what drives are bad?
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post #3 of 21
7/31/09 at 8:18am
Thread Starter 
not that i could find, just stuff to view the drives. and one drive says empty and the other is red..
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post #4 of 21
7/31/09 at 8:22am
Download this. http://support.wdc.com/product/downl...id=613&lang=en

Then burn it to a disk and boot to the CD. It is the Western Digital hdd diagnostic utility. Should read your array and scan the drives.

The one that reads empty could be broke, or it could be the hdd flashing red, maybe both.
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post #5 of 21
7/31/09 at 12:52pm
@OP

How do you "view the array"? Through special software or a web browser? I'm wondering if the software does real-time monitoring. If so, you should be able to yank a SATA cable and see what the software says when it notices.

This is one pet peeve I have with RAID cards. Without LEDs on the card near the connectors, you're dependent on either a dedicated hot-swap setup (i.e IcyDock 5-in-3 or Norco 4020) or manual yanking.
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post #6 of 21
7/31/09 at 1:05pm
Thread Starter 
it is one of those deals where i press ctrl+r when the computer is booting and i get a dos like screen
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post #7 of 21
7/31/09 at 1:08pm
So, what does it say apart from "Press Control +R"? Something like "Promise" or "Silicon Image"? "Dell PERC" maybe?
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post #8 of 21
7/31/09 at 1:10pm
Thread Starter 
honestly i dont remember, i looked and couldnt find anything. i was gonna check the device manager but unfortunately i am not familiar with linux or how to find their device list...

I will be going to his house in an hour though, i should find out then if the previous WD tools doesnt help me.

thanks!
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post #9 of 21
7/31/09 at 1:14pm
It's probably INDEX #5, but DRIVE #6. Indexes for arrays start at 0 and work up, so the drives are probably labeled from 0-7, but when you look at a graphical representation, the index #5 drive will be the 6th on the list.

Also, see if the SATA device they are plugged into has numbers near the slot. Most of the ones I worked with do have numbers to identify which slot is which, and then you just follow index #5 to the HDD, replace, and done.

You shouldn't have to tell it to repair the drive. Load up Windows, look at the array management software, and it should be automatically rebuilding the array with the next drive when you look.
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post #10 of 21
7/31/09 at 1:14pm
Also... is the port numbering 1-6 or 0-5?

The fifth bad drive on a 0-5 numbering system would be port #4....

EDIT: Dang it... too slow.
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