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Can I shrink array size in Dell PERC RAID-5?

Posted on 2010-01-12
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A few months ago we were going to add a drive to our raid 5 array. We put in another 73GB drive and added it to the array, 4 disks total. Instead of making a separate 73GB partition we figured to get two 146GB drives and make a raid 1 array.

So I am asking if this can be done, can I shrink the raid 5 array size back to 3x73GB? I looked around in the Dell Open Management and only saw the option to 'offline' the 4th 73GB drive. I would expect that will make the array non-redundant until I replace the hard drive.
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Question by:modulok
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David earned 2000 total points
ID: 26295877
The firmware does not support this feature. You will have to perform a backup, then rebuild the array the way you want to, then restore.  (Obviously make sure that the file system will fit in the smaller partition)
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by:modulok
ID: 31676258
HAHA ok thanks!

That will not be happening. Unfortunately the raid 5 (which came from dell) was configured so all 3 drives were in the array, with the c drive being a 12GB partition.
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by:David
ID: 26296104
Yep, those bozos at Dell did it to me as well.  You would think that they would at least have a pre-installation option for RAID config.  Personally, I would just kick off a backup some weekend to external disk, and build it the right way, at least if you want any sort of performance.  They also probably set the stripe size way to big, which makes it run well on throughput benchmarks, but hurts overall performance for servers which traditionally does a good deal of transactional I/.O.
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