I have followed your instructions and compared my map, didn't see faulty results and proceeded.
Good!
Quote:
Originally Posted by c3rb3rus
Now I believe hdisk42 is a good disk, anyway to test that? How would I go about adding this disk if the above proves true to vg_usr1 to gain space?
You do not need to test that. Adding a disk to a VG means formatting it, so the system will tell you if the disk is faulty. Do the following to add a new disk to a VG:
If everything goes well there is no output at all, otherwise diagnostic messages will appear.
Notice that a physical volume (a "disk" in LVM speak) can only contain 1018 PPs in an ordinary VG. This means that because of your PP size of 128M (see lsvg vg_usr1 output) you can only add disks up to somewhat below 128G in size. If your hdisk42 is bigger than this you need to introduce a "factor". This means the usual limit of 32 PVs each 1018 PPs in size is divided/multiplied by this factor: a factor of 2 means that only 16 PVs can be used but each PV can hold 2036 PPs. You change the factor by:
Quote:
Originally Posted by c3rb3rus
Essentially what we did is remove the bad disk because the partitions on it were available on a mirrored disk?
Not quite. You were able to remove the bad disks because you still had one good copy of every LP. Logical volumes (LVs) consist of "logical partitions" (LP) which are in turn made of "PPs" (physical partitions). PPs are parts of a disk. If you create an unmirrored LV you assign one PP to each LP the LV consists of. Creating a mirrored LV means assigning 2 PPs to every LP and writing data to these two different (disk) locations in parallel.
After adding the new disk you might want to remirror the VG. First find out which LVs are affected. Here is an example:
The first LV is mirrored, the second is not and the jfslog LV is not mirrored too. Use the mklvcopy command to create mirror copies of unmirrored LVs. You could use the mirrorvg to do that but only if hdisk42 offers the same or more space as the missing disks together, because you do not have any space reserves in your VG (see "free PPs" in the lsvg output).
Hello
I've been working on AIX 5.3 ML3 on IBM pSeries520. That server has 6 HDD drives in 3 volume groups (1+mirror in each group). I must check which phisical disk is which disk in the system. For ex. I want to know that disk in 4th slot in the machine is marked as hdisk5 on AIX. Does anybody... (2 Replies)
My root disk is failed and how to replace the root disk in AIX.
Can u give a detailed explanation in step wise.
Pls give the answer taking different scenarios.
Regards
Praveen (1 Reply)
hello
i'm running on P570 box aix 5.3 8 cpus 24G ram
there are 1850 users loged in to this box
the problem is that the two sysytem disks busy all the time
hdisk0 100% busy
hdisk1 100% busy
some one have an idea what writing to this disks?
thanks
ariec (9 Replies)
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