I am using compaq proliant dl580 server using poweredge raid controller,some days ago i head a non stopping beep and i found a msg on screen one logical drive degraded, fortuneately i had a spare harddisk of same kind 18gb and i replaced it in the bay, i am using raid 5,now after replaceing the harddisk it shows new harddisk added but when i get in console of raid (CTRL + M) there i am unabale to reconstruct i found there one harddisk failed, i tried to format that new harddisk but failed, i tried to make it online. but all seems not working. what could b possible reason is there any way i can check this harddisk is it happening bcaz there might b possibally data in it
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Re: 1 logical harddisk degraded, RAID Poweredge
Revert back to original configuration of hdd in your RAID setup. Boot to SCIS BIOS and double check functionality of hard drives. The error is probably telling you that Disk1 is degraded because disk 0 is failing and you removed the wrong hard drive.
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Then you need to get into the BIOS of the PERC RAID controller and inspect the state of the physical/logical volumes. Reboot the machine and watch for the prompt after the PERC5/6 RAID controller loads it's BIOS.
Considering this a null issue given the age, though...
Sounds like you have a RAID. Take a look at the RAID management software and see if the RAID is degraded. If it is degraded you probably have a bad drive on your hands. Replace the drive and the RAID should rebuild. If it is not degraded. I would turn the server off for a sec remove all the drives and blow out the RAID carriage. I tend to do this anyway on our servers every quarter to keep the system clean and cool. Hopefully this helps.
2 drives indicates they are RAID 1, which are mirrored. 2 x 36GB = 36GB. This is an industry standard config. If you make any changes you will lose the array making it RAID 0 (no RAID - no longer hot swap), and or the complete loss of OS / data.
Instead make another logical drive for data storage. You need three or four drives to set up as RAID 5, again an industry standard config.
In a RAID 5 config, you need at least 3 drives (you can have more however). A small part of every drive is then reserved for recovery data for the other drives. So two drives together hold all the data needed to restore a 3rd drive.
The Raid Controllers in the Dell Poweredge Servers are hot swappable. So you can just pull the faulty disk and then insert a new replacement drive in the same slot (Needs to be the same type and size or bigger. However, if the disk is bigger than the other 2, then only the size of the two other disks will be used on the new drive). The Raid controller will then see that there is a new disk and automatically start the recovery process. You will be able to see this when you open the Controller software. Once the recovery is done, the RAID 5 will be fully functional again.
While one of the disks is faulty or missing the two remaining disks will continue to work, but at the severely degraded performance. After the rebuild the performance will be back to the way it was before.
The rebuild can take more than an hour, depending on the disk sizes used.
There is also an option on some Controllers to select one drive as a "spare". Then you insert one more disk and set it as spare. It will not start working unless one of the other disks in the Raid fails. That's when it is used automatically as a replacement.
Check the PowerEdge Raid Controller for parity problems. Sounds like the status on the physical volumes participating in a RAID array has been degraded.
Loud beeping from a drive is usually an indication that an invalid drive array member has resulted in a degraded logical volume.
If you were counting correctly, you had at least three drives - most likely participating in a RAID-5 setup. The array might have been rebuilt with one bad drive. But it sounds like you've got two corrupt physical volumes in the array. And that's not good.