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RE: [linux-lvm] About Extending LVM size with Hardware Raid



On Wed, 2004-04-21 at 15:05, Vahric MUHTARYAN wrote:
> 	Okey you mean create a new raid5 with new disks and add it to volume
> group okey you right . 
> 
> 	But My question is , Think that I have raid5 array with 3 disk ( I'm
> using ICP Raid controller card )  then I add 4.th disk to my raid array ( I
> know clearly that I can extend raid5 ) at this I have more disk space but I
> have to intorduce it to system , and I can't imagine How ?! it's easy if I
> have free partiton but I can't show this extended array like a free
> partition  :( 
> 

This is not so much a LVM thing, as a question for your controller card
manufacturer. Linux software RAID5 can extend a software RAID5 array, by
shuffling data around on the existing and new disks, and recalculating
the checksums (see the raidreconf command).

With hardware RAID5, however, unless your hardware vendor has provided a
tool to do this, you're stuck with saving off the data to another
location, rebuilding the array, and copying the data back.

Maybe the ICP folks can help you,
Jeff



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