topic How to create a new RAID set to add more hdisks in Operating System - Linux

How to create a new RAID set to add more hdisks

Anh-Thu Tran — Tue, 17 Oct 2006 09:45:19 GMT

I have DELL 2850 with Redhat ES3 update6 installed. The machine has been configured with hardware RAID 5 for 4 disks. Now we need to add more 2 hard disks to it. How can we configure them with hw RAID 5 without affecting the current filesystems setup.
Filesystem Size Used Avail Use% Mounted on
/dev/sdb3 9.9G 334M 9.1G 4% /
/dev/sda1 99M 25M 69M 27% /boot
/dev/sdb1 20G 503M 19G 3% /home
/dev/sdb5 5.8G 2.3G 3.3G 41% /opt
none 2.0G 0 2.0G 0% /dev/shm
/dev/sdb6 4.1G 2.4G 1.5G 61% /usr
/dev/sdb7 2.0G 1.5G 390M 80% /var
/dev/sdb9 28G 17G 9.9G 63% /fsbuild
/dev/sda2 68G 54G 11G 85% /fs21

Thank you.

Re: How to create a new RAID set to add more hdisks

Steven E. Protter — Tue, 17 Oct 2006 11:30:59 GMT

Shalom,

Generally:
http://www.redhat.com/docs/manuals/enterprise/RHEL-3-Manual/sysadmin-guide/

The key issue here is how the raid was set up in the first place.

The raid 5 device, /dev/md0 or whatever its actual name is has to be extended to include the additional disk

parted or fdisk may be used to extend the raid 5.

Then comes the fun of extending the actual filesystems, if that is what you intend to do. I would need to know more about the system to advise on that.

SEP

Re: How to create a new RAID set to add more hdisks

George Liu_4 — Tue, 17 Oct 2006 13:34:29 GMT

NO. You can't. You have to rebuild the HW RAID out of the OS.

Re: How to create a new RAID set to add more hdisks

Anh-Thu Tran — Tue, 17 Oct 2006 15:13:39 GMT

I believe I should do it in BIOS menu, but not sure how to do it, and more important keep it separate from the current FS setup.