The disk is showing fault and so is Navisphere. In Navisphere it is showing the drive as being the status of remove.
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EMC SAN Software Array Failure
I am having trouble with my EMC CX500 my first enclosure is showing the error of "Bus 0 Enclosure 0 : Faulted". I am not a storage expert and I wanted to know if I remove the disk and reset it to rebuild would it affect the array software that is hosted on that disk array? Thanks in advance.
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Answers
Drive 3 is dead. You need a new one - the faulted drive is the fourth from the left (looking at the front) and should have an amber light on it. You'll need a spare EMC drive - the drives are formatted at 520 bytes/sector, so you can't just whack in any old drive you have lying around.
The array software is in a 6GB partition on each of the first four drives. The vault partition (the write cache dump area) is a RAID 3 structure within the 6GB partition that is spread across the first five drives. The fifth drive is used for the vault and for recovery software and a dump area. The array software will rebuild automatically as part of the rebuild process, so you're quite safe replacing the drive. The array's software partitions will sustain a double or even triple vault (in theory - note that the user data on those drives won't sustain a double fault...), but while there is a vault drive faulted, write cache is disabled and array performance is affected. Bets replace the faulted drive ASAP. Again, no outage is required, and the rebuild shoul be pretty quick. Given you've got a CX500, I'd expect teh rebuild to take around two to three hours depending on the size of the drives.
Just pull the drive out and place it back in . This will work, but you need to replace this drive with same part number.
if you have the EMC contract call them to replace the faulted drive.
If not check the part number this way
navicli -h (IP of the SPA or SPB) getdisk 0_0_3
The above command will list you all the disks check for the disk (Bus 0 Enclosure 0 Disk 3) part number and replace it and other details of the disk.
First five disks (0-4) will be having software and vault sitting on them.This might have caused write cache disabled for one of the SP.Will have very little performance issues if the utilization is more.
If you have a hotspare, then it will be replacing this faulty disk.
What ever the case you will not have any issues for resitting the drive.You have redendency in all .
See to that your write cache is enabled on both SPA and SPB.
use the below command to check.
navicli -h (IP of SPA or SPB) getcache.
Best practice is to replace the disk, even it may work now after you reseat , but you need the replacement of the disk in long run.
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by: andyalderPosted on 2009-11-02 at 12:54:47ID: 25723602
Until one of our EMC experts pops in (probably meyersd) and says otherwise I would say never remove a disk when you have an enclosure attachment problem. It may be tolerated but you do introduce a double fault, although admittedly one on an individual disk and one with a whole shelf of disks so effectively at diffreent levels.
Is a disk indicated as having a fault as well as the enclosure it is in?