Linux not picking up new partition correctly on emc pseudo device
- by James
Hi
We have a database server running oracle rac. We were recently running out of space on the main LUN that it is attached to. I created a new 100GB LUN and concatenated this onto the existing LUN creating a new MetaLUN. After some messing I managed to get linux to recognise the new space. I then created a new partition in on the pseudo device, to use the new space. Previously when I have done this on other system the next step is to create an ASM disk on the new partition and add this disk to the oracle disk group. This however fails. I am aware of various issues with ASM and powerpath, but I don't think this is the issue here. As on while investigating the issue I discovered that one of the underlying logical device is not reflecting the size change. See below;
Powermt displays all of the underlying logical units
[root@XXXXX~]# powermt display dev=emcpowerd
Pseudo name=emcpowerd
CLARiiON ID=CKM00091500009 [VFRAC2]
Logical device ID=6006016030312200787502866C65DE11 [LUN 30]
state=alive; policy=CLAROpt; priority=0; queued-IOs=0
Owner: default=SP A, current=SP A Array failover mode: 1
==============================================================================
---------------- Host --------------- - Stor - -- I/O Path - -- Stats ---
### HW Path I/O Paths Interf. Mode State Q-IOs Errors
==============================================================================
3 qla2xxx sde SP A0 active alive 0 0
3 qla2xxx sdj SP B0 active alive 0 0
4 qla2xxx sdo SP A1 active alive 0 0
4 qla2xxx sdt SP B1 active alive 0 0
Fdisk on the pseudo device shows correct space.
[root@XXXXX ~]# fdisk -l /dev/emcpowerd
Disk /dev/emcpowerd: 429.4 GB, 429496729600 bytes
255 heads, 63 sectors/track, 52216 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/emcpowerd1 1 39162 314568733+ 83 Linux
/dev/emcpowerd2 39163 52216 104856255 83 Linux
fdisk on one of the logical units is wrong
[root@XXXXX~]# fdisk -l /dev/sde
Disk /dev/sde: 322.1 GB, 322122547200 bytes
255 heads, 63 sectors/track, 39162 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sde1 1 39162 314568733+ 83 Linux
/dev/sde2 39163 52216 104856255 83 Linux
fdisk on the rest of the units is fine
[root@XXXXX ~]# fdisk -l /dev/sdj
Disk /dev/sdj: 429.4 GB, 429496729600 bytes
255 heads, 63 sectors/track, 52216 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdj1 1 39162 314568733+ 83 Linux
/dev/sdj2 39163 52216 104856255 83 Linux
Also when I created the the partition linux did not create the any entries in the /dev directory for the second partition so I created these manually
[root@XXXXX dev]# mknod sde2 b 8 66
[root@XXXXX dev]# ls -al sd[ejot]?
brw-r----- 1 root disk 8, 65 Dec 29 14:20 sde1
brw-r--r-- 1 root disk 8, 66 Apr 8 20:31 sde2
brw-r----- 1 root disk 8, 145 Dec 29 14:19 sdj1
brw-r--r-- 1 root disk 8, 146 Apr 8 20:33 sdj2
brw-r----- 1 root disk 8, 225 Apr 6 23:12 sdo1
brw-r--r-- 1 root disk 8, 226 Apr 8 20:33 sdo2
brw-r----- 1 root disk 65, 49 Dec 29 14:19 sdt1
brw-r--r-- 1 root disk 65, 50 Apr 8 20:33 sdt2
This is a production server that we cannot easily reboot.
Any ideas would be much appreciated.
J
