On Wednesday 27 August 2008 21:49:22 Benoit St-Pierre, you wrote : > I though you can have up to 255 partitions/drive. The partitions would be > in a RAID array so I wouldn't have to deal with them directly anyway.
After little googling, it seems that the number of logical partitions may be unlimited as it is organized like chained lists, each logical partitions indicating the size of the following... but under linux, the number of partitions for an IDE drive is limited to 63 while for SCSI one it's 15. Maybe these limits were over, but i don't know enough about linux disk management to say anything more... > On Wed, Aug 27, 2008 at 3:20 PM, Xav' <[EMAIL PROTECTED]> wrote: > > On Wednesday 27 August 2008 21:00:11 Benoit St-Pierre, you wrote : > > > I'm in the planning stages of setting up a file server and am > > > considering using RAID. > > > > > > My concern is that my drive sizes are mixed. I have two 500GB SATA > > > > drives, > > > > > a 320GB IDE and a 250GB IDE. > > > > > > I would like to set these up so that the maximum amount of disk space > > > is usable, but still be able to recover from any one drive failing. I > > > would also like to be able to add drives of any size as easily as > > > possible. > > > > > > Is it possible to split each disk into a bunch of 10GB partitions, > > > giving me 157 partitions in total, and specifying that I want to have > > > 50 partitions worth of parity info so that if any 50 partitions go bad > > > (ie: one of the 500GB disks) the RAID can recover? Adding/replacing > > > would be simple if I can change the amount of parity info to keep, but > > > I don't > > > > know > > > > > if this is actually possible. It looks as though spares need to be > > > explicitly given so, if a disk with lots of spares goes down, it's not > > > going to work. > > > > AFAIK, it's not possible to have so much partitions under linux, but i > > can't > > remember the maximum of supported partitions... but good luck to manage a > > so > > wide number of partitions ! > > > > > Another option I see is if I create 4x 250GB partitions (one on each > > > > drive) > > > > > in one RAID5 array, 3x 70GB partitions (on the 3 larger drives) in > > > > another > > > > > RAID5 array, and two 120GB in a RAID1 array. The RAID1 array reduces my > > > total available disk space a bit, which is less than ideal and > > > adding/replacing disks would be more of a headache. > > > > IMHO, i think this could be a solution. This is possible using software > > RAID as > > it's in the kernel, and then reassemble created raid partitions in one > > LVM volume group, so you can use partitions of any space ! > > > > > I remember reading something about using LVM and RAID to achieve this, > > > > but > > > > > everything I've found has been for identical drives. > > > > > > Any suggestions? > > > > HTH. > > > > Xavier Parizet
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