I have encountered the issue with the hard disk, the disk is failed and need to replace by the new one.
As my understanding, this is just to take out the failed disk and insert the new ones, and that's all.
But the third party hardware vendor said, there should be another procedure in AIX for this activity.
I have attached the screenshot for disk checking.
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I am only guessing, but I think you might need to format the new disk with the correct filesystem format and also correctly partition the disk before you swap them out.
As further checking, I can see it is local disk with RAID 5 in "Change/Show PCI-X SCSI pdisk" in smitty. As shown below, it's a disk inside the hdisk5 scsi raid 5 disk array.
Code:
xxx@/#lsdev -Cc disk
hdisk0 Available 04-08-ff-0,0 SCSI RAID 10 Disk Array
hdisk2 Available 00-08-02 1814 DS4700 Disk Array Device
hdisk3 Available 00-08-02 1814 DS4700 Disk Array Device
hdisk4 Available 00-08-02 1814 DS4700 Disk Array Device
hdisk5 Available 04-08-ff-0,1 SCSI RAID 5 Disk Array
So I though, just take out the missing disk, insert the new disk and format it with "create an array candiate pdisk and format to 512 byte sectors". But I'm not sure about this.
Code:
x Change/Show PCI-X SCSI pdisk x
x x
x Move cursor to desired item and press Enter. Use arrow keys to scroll. x
x x
x 0940-038 scsi2: Open not attempted. Device not Available. x
x 0940-038 scsi3: Open not attempted. Device not Available. x
x pdisk0 04-08-00-3,0 Active Array Member 142.8GB x
x pdisk1 04-08-00-4,0 Active Array Member 142.8GB x
x pdisk2 04-08-00-5,0 Active Array Member 142.8GB x
x pdisk8 04-08-00-8,0 Active Array Member 142.8GB x
x pdisk4 04-08-01-3,0 Active Array Member 142.8GB x
x pdisk5 04-08-01-4,0 Missing Disk 142.8GB x
x pdisk7 04-08-01-8,0 Active Array Member 142.8GB x
x pdisk3 04-08-01-5,0 Active Array Member 142.8GB x
I am a bit confused: is this a disk in your AIX system as you said in #1 or a disk in a separate RAID as you said in #2? Usually, if you have an external raid, by formatting it forms one virtual disk (the whole RAID set) which you then in turn can see in AIX as a single hdisk device. Please explain your hardware setup (what is connected to what, etc.) a bit more detailed.
If your disk is part of a RAID set which is managed by an external device you need to follow the procedures of this external device. That may be anything, you will have to look it up in the respective manual of the device.
Notice that the following only applies if the system is not part of a cluster!
If the disk is directly attached to the system (that basically means you have a hdisk device /dev/hdiskNN for this single disk) you CANNOT remove it simply! Disks are uniquely identified by a "PVID" (physical volume ID) and AIX will notice that this disk is not that disk, regardless of them being identical hardware. (To be honest, it is, in fact, possible to de-configure a physically removed disk but that is really complicated work including manually patching the ODM - you do NOT want to have to do that if you can avoid it.
The correct way to remove the disk is: identify part of which volume group it is by using the lspv command. Move all LVs occupying space on that disk to other disks (if it is only one copy of mirrored LVs simply remove the copy (rmlvcopy and remirror once the new disk is in place) by using the lmigratepp command.
When the disk has no occupied PPs any more (check with lsvg -p <volume-group>) remove it from the VG with:
Code:
reducevg <vg-name> <hdiskNN>
Now - ONLY NOW! - you can pull the hdisk and replace it with the new one. Run a cfgmgr then to discover the new disk. Add it the VG by doing a:
Code:
extendvg <vg-name> <hdiskNN>
it will format the disk and put a PVID on it in the process.
Now you can use the space provided by the new disk. If you have deleted a mirror from a LV before, create a new mirror using the mklvcopy command. If you want to move a whole (unmirrored) LV to the new disk: create a mirror copy the same way and remove the original. This is faster then moving single PPs around.
]I am a bit confused: is this a disk in your AIX system as you said in #1 or a disk in a separate RAID as you said in #2? Usually, if you have an external raid, by formatting it forms one virtual disk (the whole RAID set) which you then in turn can see in AIX as a single hdisk device. Please explain your hardware setup (what is connected to what, etc.) a bit more detailed.
--> My hardware setup is that I have a RAID5 disk hdisk5 (inside it are the pdiskx).
Code:
hdisk0 04-08-ff-0,0 Optimal RAID 10 Array 142.8GB
pdisk0 04-08-00-3,0 Active Array Member 142.8GB
pdisk1 04-08-00-4,0 Active Array Member 142.8GB
hdisk5 04-08-ff-0,1 Optimal RAID 5 Array 714.3GB
pdisk2 04-08-00-5,0 Active Array Member 142.8GB
pdisk8 04-08-00-8,0 Active Array Member 142.8GB
pdisk4 04-08-01-3,0 Active Array Member 142.8GB
pdisk3 04-08-01-5,0 Active Array Member 142.8GB
pdisk7 04-08-01-8,0 Active Array Member 142.8GB
pdisk5 04-08-01-4,0 Active Array Member 142.8GB
My volume group
Code:
xxx@/#lsvg -p YYYY
SSAMvg:
PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION
hdisk5 active 532 45 00..00..00..00..45
My raid configuration
Code:
0940-038 scsi2: Open not attempted. Device not Available.
0940-038 scsi3: Open not attempted. Device not Available.
------------------------------------------------------------------------
Name Location State Description Size
------------------------------------------------------------------------
sisioa0 04-08 Available PCI-X Dual Channel U320 SCSI RAID Adapter
scsi0 04-08-00-07,0 NoLink No remote adapter target
scsi1 04-08-01-07,0 NoLink No remote adapter target
hdisk0 04-08-ff-0,0 Optimal RAID 10 Array 142.8GB
pdisk0 04-08-00-3,0 Active Array Member 142.8GB
pdisk1 04-08-00-4,0 Active Array Member 142.8GB
hdisk5 04-08-ff-0,1 Optimal RAID 5 Array 714.3GB
pdisk2 04-08-00-5,0 Active Array Member 142.8GB
pdisk8 04-08-00-8,0 Active Array Member 142.8GB
pdisk4 04-08-01-3,0 Active Array Member 142.8GB
pdisk3 04-08-01-5,0 Active Array Member 142.8GB
pdisk7 04-08-01-8,0 Active Array Member 142.8GB
pdisk5 04-08-01-4,0 Active Array Member 142.8GB
We have pulled out the failure disk pdisk5 and added a new hard disk.
Anything is fine until trying to add the new disk to the RAID and encountered the issue below:
Code:
hdisk5 changed. hdisk 5 has been expanded. However, hdisk5 needs to be unconfigured and reconfigured prior to the system being able to use the increased capacity.
Note: the volume group, logical volumes, and file systems associated with hdisk5 might need to be changed in order to make use of the increased capacity.
After some checks, I can see the hdisk5 becomes bigger with new size but the VG still in the old size.
After some checks, I can see the hdisk5 becomes bigger with new size but the VG still in the old size.
It seems that the "physical" layer of the RAID is already reconfigured. Perhaps you have re-read the configuration too with the cfgmgr command and hence hdisk5 (this is the "logical" representation of the whole RAID) has become bigger. Anyways, you can make sure that the "new" hdisk5 is identified correctly in all its aspects.
Unmount the filesystems of the VG, then do a varyoffvg <VG> . Then delete the hdisk device and rediscover it:
Code:
rmdev -Rl hdisk5
cfgmgr
Now you need to tell the volume manager that the VG has changed. Issue a
Code:
chvg -g <volume-groupname>
which should do the trick. I am not sure if the VG needs to be varied on or off for that, so try in varyoffvg mode and if you get an error do a varyonvg <VG> and try again.
Ah, a last thing:
Quote:
We have pulled out the failure disk pdisk5 and added a new hard disk.
DON'T DO THAT!
In this case you were lucky, but generally - as i wrote above - it is a bad idea to remove disks which are still known to the system. Always deconfigure them first and pull them only then.
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