[raybakh]

Hi guys,

Previously i've this xSeries with internal 73GB hdd running on Red Hat. Currently we bought a DS4800 to add additional 100GB on the Red Hat. I dont see any prob on hardware spec, my main concern is how to get Red Hat recognize the new additional space, and how add it to the existing mount group.

Any help, commands, docs, url, would be appreciated.

[steevojb]

Hi There,

If are runnnig a 2.6 kernel, you can perform the following that will scan all channels, targets, and LUNs on host H.

echo “- - -” > /sys/class/scsi_host/hostH/scan

Otherwise, I would reboot the server.

For adding new disk to volume groups, I trust you are using LVM

For an LVM howto consult the following link

http://tldp.org/HOWTO/LVM-HOWTO/

HTH

Steve

[raybakh]

Thanx Steve for the reply..

Configuring the LUN from DS4800 is a straight forward thing, Whew.
The tricky part is detecting the storage from Red Hat.
When i type # dmesg , there would be a lot of I/O buffer and errors and it seems that it replicate the LUNs until 160 instead of the ori 10 assigned LUN.

From SANsurfer, each HBA replicate up till 4 set of node with 10 LUN in each node. That explain why there are 160 LUN images.

Can somebody please help me to correct this. I've already installed the latest HBA fimware, latest RDAC, SMagent,runtime,utility and SANsurfer.

I thank you in advance for your help.

[raybakh]

by running the dmesg command, I could see, a lot of
Buffer I/O error on device sdc, logical block 5 and list just go on and on.

Anybody can help?

[steevojb]

Have you rebooted your server since presenting your new LUNs ?

Can you see from LUNs from fdisk -l ?

How have you zoned your HBA cards on your switches ?

I haven't any experience with RDAC on linux so unable to give anything practice

Regards

Steve

[raybakh]

Hi all,

Finally after 4 straight days of no sleep. Have finally solve the prob.

1. Unplug the fibre cable from the HBA
2. Reboot the server
3. Install the latest HBA firmware
4. Reboot the server
5. Install RDAC
6. Vi /etc/grub/grub.conf to include the rdac image
7. Make initrd with the old image
8. Reboot the server
9. Plug in the fibre cable
10. Run command hot_add
11. Run fdsik -l and walaa, all the disk are there.

Thankx.

Another thing im querying is, i've assigned 70GB of LUN from the Storage Manager but Red Hat detect it as 75GB. I wonder where the additional 5GB come from. Anybody knew?

[jrigler]

Originally Posted by steevojb

Hi There,

If are runnnig a 2.6 kernel, you can perform the following that will scan all channels, targets, and LUNs on host H.

echo “- - -” > /sys/class/scsi_host/hostH/scan

Steve

Wow, this actually seemed to work, its a for cry from cfgmgr, though.