Re: Multiple raids on one machine?

2006-06-27 Thread Nix
On Tue, 27 Jun 2006, Chris Allen wondered: > Nix wrote: >> There is a third alternative which can be useful if you have a mess of >> drives of widely-differing capacities: make several RAID arrays so as to >> tesselate >> space across all the drives, and then pile an LVM on the top of all of them

Re: Multiple raids on one machine?

2006-06-27 Thread Chris Allen
Nix wrote: On 25 Jun 2006, Chris Allen uttered the following: Back to my 12 terabyte fileserver, I have decided to split the storage into four partitions each of 3TB. This way I can choose between XFS and EXT3 later on. So now, my options are between the following: 1. Single 12TB /dev/md0, p

Re: Multiple raids on one machine?

2006-06-27 Thread Nix
On 25 Jun 2006, Chris Allen uttered the following: > Back to my 12 terabyte fileserver, I have decided to split the storage > into four partitions each of 3TB. This way I can choose between XFS > and EXT3 later on. > > So now, my options are between the following: > > 1. Single 12TB /dev/md0, par

Re: Multiple raids on one machine?

2006-06-26 Thread Chris Allen
Gordon Henderson wrote: I use option 2 (above) all the time, and I've never noticed any performance issues. (not issues with recovery after a power failure) I'd like to think that on a modern processor the CPU can handle the parity, etc. calculations several orders of magnitude faster than the

Re: Multiple raids on one machine?

2006-06-26 Thread Gordon Henderson
On Sun, 25 Jun 2006, Chris Allen wrote: > Back to my 12 terabyte fileserver, I have decided to split the storage > into four partitions > each of 3TB. This way I can choose between XFS and EXT3 later on. > > So now, my options are between the following: > > 1. Single 12TB /dev/md0, partitioned int

Re: Multiple raids on one machine?

2006-06-25 Thread Bill Davidsen
Chris Allen wrote: Back to my 12 terabyte fileserver, I have decided to split the storage into four partitions each of 3TB. This way I can choose between XFS and EXT3 later on. So now, my options are between the following: 1. Single 12TB /dev/md0, partitioned into four 3TB partitions. But how

Re: Multiple raids on one machine?

2006-06-25 Thread H. Peter Anvin
Chris Allen wrote: 2. Partition the raw disks into four partitions and make /dev/md0,md1,md2,md3. But am I heading for problems here? Is there going to be a big performance hit with four raid5 arrays on the same machine? Am I likely to have dataloss problems if my machine crashes? 2 shoul

Re: Multiple raids on one machine?

2006-06-25 Thread Jim Buttafuoco
use LVM, that way you can resize the volumns -- Original Message --- From: Chris Allen <[EMAIL PROTECTED]> To: linux-raid@vger.kernel.org Sent: Sun, 25 Jun 2006 23:37:01 +0100 Subject: Multiple raids on one machine? > Back to my 12 terabyte fileserver, I have decided

Multiple raids on one machine?

2006-06-25 Thread Chris Allen
Back to my 12 terabyte fileserver, I have decided to split the storage into four partitions each of 3TB. This way I can choose between XFS and EXT3 later on. So now, my options are between the following: 1. Single 12TB /dev/md0, partitioned into four 3TB partitions. But how do I do this? fdisk