Amber light and disk rebuild question

Hi,

We are running  poweredge 2950 and amber light is flashing found out that one of the drive id dead and it configured with raid5. If I just replce the drive and reboot the system, would it rebuild automatically? Or do I need to anything in raid controller vdisk setting?  Thanks in advance.

mokkanAsked:
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DewFreakCommented:
Depending on your controller the array should rebuild itself.
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DavidPresidentCommented:
If  it doesn't automatically restart, then run the array manager software, select the drive, and make it a hot spare. Then if it still doesn't start, you may need to force a rebuild.  the process and exact procedure depends on your RAID controller.  Since this is a dell then I assume it is a Dell controller.  If you are not running the windows, linux, or whatever O/S you are running version of their management software, you should download and install it.  Then set it up.

Finally, the vast majority of controllers will let you do a rebuild from the BIOS.  This is a preferred method, and will run much faster. That is because there won't be background I/Os from your host OS
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PowerEdgeTechIT ConsultantCommented:
Yes, a rebuild should happen automatically on either the PERC 5/6 or SAS 5/6 controllers.  If not, then you can start it manually through the BIOS CTRL-R option or using OpenManage Server Administrator (Array Manager is not supported on the 2950).  Go to Storage>PERC/SAS>Connector/Backplane>Physical Drives.  The replacement drive will show as READY if not rebuilding.  Choose Rebuild from the drop down menu (do NOT Force Online).

If you don't have Server Administrator installed, you can download and install it.

ftp://ftp.dell.com/sysman/OM_6.2.0_Man_Node_A00.exe

Download and run to extract files, then run C:\Openmanage\windows\setup.exe.  Choose Custom install and make sure Storage Management (and all subfeatures) is installed.
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webbster20Commented:
Btw, you should not have to reboot the box, that defeats the purpose of a Hot spare
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DavidPresidentCommented:
agree
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webbster20Commented:
That is true.
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mokkanAuthor Commented:
Thank you guys for all the help.  Yes, it has PERC 5/i. Which disk I need to select as hotspare?
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mokkanAuthor Commented:
Also, there are 5 disks on the box. Thanks in advance. Sorry I'm new to hardware raid.
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DavidPresidentCommented:
Download the dell PERC management software from the dell support site.  (I assume you are windows based,) it will give you a GUI so you can see what is going on, and you can kick off a rebuild based on what it tells you is the unused disk.  That way it is difficult to mess up
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PowerEdgeTechIT ConsultantCommented:
In OpenManage it will show you the status of each drive - ONLINE/rebuilding/regenerating or READY.  If it is ready, then you can choose Assign Hot Spare from the drop down.
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mokkanAuthor Commented:
Sorry, I'm using Linux. Only I can check using bios?
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PowerEdgeTechIT ConsultantCommented:
There are Linux packages of the software too, but I don't know enough about them to advise.  It is very easy to do using the CTRL-R BIOS utility.
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DavidPresidentCommented:
Yes, they have LINUX distributions, but they are for specific kernels.   You will have to go to the BIOS utility if you are not running one of the supported flavors
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mokkanAuthor Commented:
Thank you.  I have checked through CTRL +R command and found that there is a one disk configured for for Hot-Spare. IF I understand correctly, the failed disk will be replaced by hot-spare one?
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DavidPresidentCommented:
interesting.  so a disk is already configured as a hot spare, and you have a failed drive, and this disk did not kick in automatically?  Look at the CTRL-R menus again.   Make sure you have a degraded LUN, and a disk did fail.   If the hot spare did NOT kick in automatically, then perhaps the hot spare drive failed, or is not physically large enough?
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PowerEdgeTechIT ConsultantCommented:
Agreed ... what do you see on the VD MGMT tab in CTRL-R?  PD MGMT tab?  Previously, did you have all 5 disks configured in a RAID 5, or did you have 4 disks with a HS?  In this scenario, if a drive had failed, the HS would have rebuilt in its place, bringing the array into full redundancy again, with any drives being added into the machine afterwards showing simply as READY.  This would not however automatically re-assign a new disk as a HS, so the fact you are seeing a HS (if you did not assign it) is a bit of a mystery.  Only three things I can think of would prevent it from switching over to rebuild (if the VD is in fact degraded) - the HS is bad, the HS is not big enough (even 1K difference can prevent it from working), or the array is damaged and knows it cannot complete a rebuild (not likely).

What is the total VD space and how large are the disks?
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