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Operating Systems AIX issue AIX MPIO path closed
# 8  
Old 05-30-2019
sudo readvgda hdisk0

empty disks will show something like

Invalid lvm_rec!
00000E00   00000000 00000000 00000000 00000000  |................|
00000E10   00000000 00000000 00000000 00000000  |................|
00000E20   00000000 00000000 00000000 00000000  |................|
00000E30   00000000 00000000 00000000 00000000  |................|
00000E40   00000000 00000000 00000000 00000000  |................|
00000E50   00000000 00000000 00000000 00000000  |................|
00000E60   00000000 00000000 00000000 00000000  |................|
00000E70   00000000 00000000 00000000 00000000  |................|
00000E80   00000000 00000000 00000000 00000000  |................|
00000E90   00000000 00000000 00000000 00000000  |................|
00000EA0   00000000 00000000 00000000 00000000  |................|
00000EB0   00000000 00000000 00000000 00000000  |................|
00000EC0   00000000 00000000 00000000 00000000  |................|
00000ED0   00000000 00000000 00000000 00000000  |................|
00000EE0   00000000 00000000 00000000 00000000  |................|
00000EF0   00000000 00000000 00000000 00000000  |................|
read_lvm_rec had an error, exiting

Disks in use will show LV/RAC/VX type info.
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# 9  
Old 05-31-2019
It's helpful Smilie
# 10  
Old 06-14-2019
Originally Posted by Phat
[root@xxx] / > lspv
hdisk0          00fa6d1288c820aa                    rootvg          active
hdisk1          00fa6d1288c8213c                    None
hdisk2          00c1cc14d6de272b                    vg_3            active
hdisk3          00c1cc14d6de27e5                    vg_3            active
hdisk4          00c1cc14d6de2898                    vg_3            active
hdisk5          00c1cc14d6de2958                    vg_3            active
hdisk6          00c1cc14d6de2a07                    vg_3            active
hdisk7          00c1cc14716beb5c                    vg_3            active
hdisk8          00c1cc14816d37d0                    None
hdisk9          00c1cc14816d38a0                    vg_3            active
hdisk10         00c1cc14816d396c                    vg_3            active
hdisk11         00c1cc14716beb98                    vg_3            active
hdisk12         00c1cc14716bebd9                    vg_3            active

Originally Posted by Phat
How can you know they are empty disks?As we can think the system is using it as non-LVM disks? And second question is, the multipath should also work for them right? Why after adding to LVM, the multipath starts working? Smilie
Look at the quoted output above: the lspv commands lists not only the disks but also to which VG they belong to. i.e. hdisk7, hdisk8, hdisk9, etc. all belong to the volume group vg_3. The two remaining disks, hdisk1 and hdisk8, belong to no VG, hence "None".

There are two possible scenarios: the disks contain a VG but where brought newly to this system and the system doesn't know about the VG. You can use the readvgda command in this case to look if the disk is empty or not and - if it is not - do a "learning import":

importvg -y <VGname> [-V <MajorNumber>] [-n] <hdisk-device>

The second scenario is that the disks are really empty. In this case you just create a new VG or add them to an existing one.

You can tell the difference by the readvgda-command as described above which reads the "volume group descriptor area" of a disk. But you can also do a

chdev -a pv=yes <hd-device>

which either reads an already existing PV-ID (physical volume ID) and adds it to the ODM or, if none is there, creates one on the disk. Then you can try the above-mentioned importvg-command which will either fail (if the disk is empty) or succeed.

I hope this helps.

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