[Discuss] samba devices and RAID

[noel at natnix.com]

I don't quite get what you're trying to do, but if you want RAID over a
network, check these out:

http://www.drbd.org/

http://www.it.uc3m.es/~ptb/nbd/

You could theoretically make a RAID out of a couple of loopback devices
on network drives, but I'd expect the performace would be horrible.  

--Noel


On Fri, Nov 10, 2006 at 12:51:04PM -0800, pw wrote:
> hello,
> 
> Is it possible to use two SMB devices as a software
> RAID set? For example if there are 2 x 2TB NAS devices
> on the network, can I mirror one to the other using RAID?
> 
> I was thinking of having two disk image files
> mounted as loops
> 
> ie:
> 
> #mount NAS drives that contain the disk images as files
> 
> mount -t smbfs -o username=yadda,password=tadda //NAS1/share /smb1
> mount -t smbfs -o username=yadda,password=tadda //NAS2/share /smb2
> mount -t smbfs -o username=yadda,password=tadda //NAS3/share /smb3
> 
> 
> #mount the disk images as loop devices
> 
> mount -o loop=/dev/loop0 /smb1/disk-image fs
> mount -o loop=/dev/loop1 /smb2/disk-image fs
> mount -o loop=/dev/loop2 /smb3/disk-image fs
> 
> 
> And then use those loop devices as devices for the
> mirrored raid.
> 
> vi /etc/raidtab
> 
> <i>
> 
> raiddev /dev/md0
>         raid-level      1
>         nr-raid-disks   2
>         nr-spare-disks  1
>         persistent-superblock 1
>         device          /dev/loop0
>         raid-disk       0
>         device          /dev/loop1
>         raid-disk       1
>         device          /dev/loop2
>         spare-disk      0
> 
> <esc><wq>
> 
> mkraid /dev/md0
> 
> 
> Stupid idea? Any thoughts?
> 
> 
> Peter
> 
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