Re: changing disk size in RAID 5
- From: "fx [François-Xavier Peretmere]" <fx@xxxxxxxx>
- Date: Thu, 03 Apr 2008 18:55:40 +0200
on the 3/04/08 18:04 morales wrote the following:
Hi,
At job we have an HP Proliant DL380 G4 High Performance with a RAID 5
array with 4 SCSI disks with 36.4 Gb capacity each one.
Last week one disk failed and the RAID 5 is working without one disk.
My problem and doubt is that HP is not selling anymore 36.4Gb disks,
just 72Gb or 142 Gb disks. My question is: What happen if I change the
disk falied and I replace with a 72 Gb one?
Can I change one disk with different size than the others 3 in RAID
5?
The theory says that RAID 5 is possible with different size disks, but
I think that is possible IF is just at the beginning when we create
the array, or am I wrong?
Theoretically, you could add a bigger disk and the RAID controller will use only as much space as there's on the smallest disk of the RAID aggregate - 36.4 Gb out of 72 or 142 in your case. That should be true not only when creating the RAID, but also when replacing a disk. I came across such a situation a long time ago and it just worked - but that was not with HP gears, and it was no critical data, so I just tried.
If critical indeed and messing up is not an option, you might want to ask HP before trying, after all support is here for that :-)
Fx
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