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[linux-lvm] JBOD/NRAID configuration with LVM (repost)



Since I've gotten no replies at all, I dare to repost...

Hello,
I'm the administrator of a file server from a student residential accommodation (from Munich, so pardon my English).

The machine is an ordinary PC (currently one HD for system, one for data, both paralell ATA). Due to the intendend use storage space is a primary issue while data safety is not too important neither is speed. Since money is also always low we need to be flexible with how we use the harddisks. For example it's unlikely to be possible to buy two or more identic harddisk to form a RAID 0.

My idea:

- Create an JBOD/NRAID of a all harddisks (except the system disk)

- The JBOD should be flexible when it comes to removing or adding another disk. For example if I want to remove a harddisk I a) unmount the JBOD b) say some kind of tool to free the harddisk to remove as completely as possible c) remove the disk software and hardware wise.

- If we manage to get our hands on another harddisk it is added to the volume. It there are already more than three disk present it replaces the smallest one.

- Hot swapping is not important. I don't think it's possible anyway due to the desktop PC hardware

- If a disk is broken the data loss should be limited to the data that actually is on that disk, the rest of the JBOD should remain functional (it is ok if it is not functional before a manual repair run)

How far is this possible with LVM? The distribution is Debian etch.

Thanks,

Florian


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