Can I expand my raid 5?

[Stefano_10]

I have an hp surestore system 2100 with 3 disks in raid 5.
The volume group created on these disks is near to fill up.
I would know if it's possible to insert the fourth disk in the system to expand the raid an so the volume group.
Thanks.
Stefano

[Vincent Farrugia]

Hello,

Since the ds2100 is a JBOD disk array, what kind of RAID controller is attached to it?

Vince

[Stefano_10]

the raid controller is:
raid 4si, pci 4 port ultra2 scsi raid

[Stefan Farrelly]

I dont think it will work becuase the raid 5 group sort of stripes itself over the 3 disks you have in it and you cant just add a 4th on the fly - this is normally configured when you first bind/create the raid5 group. Extending an existing raid5 group is normally not possible without wiping the group and having to recreate it (losing your data).

[Leif Halvarsson_2]

Hi
If it not is possible to extend the Raid-set witout recreating (and destroying data) it should be possible to create a new Raid-set and extend the volume group (without destroying any data). But this needs 3 (or more) extra disks.