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RAID management - Predictive disk SMART failure
Hi,
I have an HP ML370 with a P400 raid controller installed. It has 6 disks in a raid 5 config. 5 active disks and a 6th spare. The ACU is reporting a SMART predictive failure event for one of the 5 active disks (the server is working normally currently).
My questions are, do i assign the spare disk in the ACU to the array? what will happen to the array when i do this? will the spare be automatically included in the array once assigned and how will i know when it is safe to remove the disk that has the predicted failure?
Many thanks
Andy
I have an HP ML370 with a P400 raid controller installed. It has 6 disks in a raid 5 config. 5 active disks and a 6th spare. The ACU is reporting a SMART predictive failure event for one of the 5 active disks (the server is working normally currently).
My questions are, do i assign the spare disk in the ACU to the array? what will happen to the array when i do this? will the spare be automatically included in the array once assigned and how will i know when it is safe to remove the disk that has the predicted failure?
Many thanks
Andy
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Yup, the spare is assigned to Array A so will kick in as soon as the one with predictive failure is removed. It doesn't say why it's predicting failure but I checked the firmware revision and although there is later firmware it's listed as optional rather than required and doesn't address any SMART problem.
ASKER
Hi - thats great, thanks very much for your help.
The rebuild priority is set to medium, is it best to remove the failing drive at the end of the day due to performance hits? Approx how long does it take for the spare to be fully built (array is 280GB)
Andy
The rebuild priority is set to medium, is it best to remove the failing drive at the end of the day due to performance hits? Approx how long does it take for the spare to be fully built (array is 280GB)
Andy
you have two options;
1) since you have identified the faulty Disk, simply remove faulty Disk plug new disk, your raid card will automatically generate parity (dont use spare in this case).
2) Go to HP Tools-¿Smart array configuration utility>Select your Raid card--->from menu you will be able to add/remove Disk is existing logical drive
if you are not expert i suggest you dont use Option 2.
1) since you have identified the faulty Disk, simply remove faulty Disk plug new disk, your raid card will automatically generate parity (dont use spare in this case).
2) Go to HP Tools-¿Smart array configuration utility>Select your Raid card--->from menu you will be able to add/remove Disk is existing logical drive
if you are not expert i suggest you dont use Option 2.
sorry for late reply, i fully agree with andy.
i opened this question when author asked the qustion but got stuck with someone, and when i posted my reply i found so many experts reply.
i opened this question when author asked the qustion but got stuck with someone, and when i posted my reply i found so many experts reply.
Could take about a day to rebuild, 4GB/hour was the old rule of thumb but it's a bit faster than thet nowadays. Rebuild priority doesn't make much difference if the server is idle anyway, if it's set to high then rebuilding taks preference so user performance decreases. If you have the replacement I'd be more tempted to remove the spare to avoid it doing the operation twice.
ASKER
superb answer - thanks so much!
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Is the spare in the array and ready to kick in automatically? It is a listed disk under 'SAS Array A with spare' in the ACU
report.zip