mirror rootvg

lo-lp-kl · August 4, 2008, 2:11pm

Hello

I have a question

I have a box with Aix 5.3 with rootvg on mirror.

I deleted a filesystem and I create a new one to install some software but when I type lsvg -l rootvg all my filesystems has mirror unless the new one.

My question is I can mirror this fs only ??? or I have to unbreak the mirror and then mirror again all the volume group (rootvg). and I can do online ?? I dont need to restart my partition

Thanks for your comments

shockneck · August 4, 2008, 2:32pm

you created a lv but forgot to tell it that it shoud consist of two mirror copies. If the unmirrored lv is located on one disk only you could mirror the lv in a two disk VG easily with

# mklvcopy <umirrored_lv> 2 <other_disk>

run varyonvg afterwards to sync.

lo-lp-kl · August 4, 2008, 5:15pm

thanks shockneck for your reply

Im sorry I dont the idea that you told me. I send a screen about my lsvg -l rootvg

$ lsvg -l rootvg
rootvg:
LV NAME TYPE LPs PPs PVs LV STATE MOUNT POINT
hd5 boot 1 2 2 closed/syncd N/A
hd6 paging 4 8 2 open/syncd N/A
hd8 jfs2log 1 2 2 open/syncd N/A
hd4 jfs2 16 32 2 open/syncd /
hd2 jfs2 55 110 2 open/syncd /usr
hd9var jfs2 12 24 2 open/syncd /var
hd3 jfs2 12 24 2 open/syncd /tmp
hd1 jfs2 12 24 2 open/syncd /home
hd10opt jfs2 12 24 2 open/syncd /opt
lg_dumplv sysdump 16 16 1 open/syncd N/A
sdump_lv sysdump 16 16 1 open/syncd N/A
Processlv jfs2 80 80 1 open/syncd /opt/IBM

the last one I need to get on mirror.

This is my lsvg rootvg output if you need it

$ lsvg rootvg
VOLUME GROUP: rootvg VG IDENTIFIER: 0009d1540000d6000000010955099d8c
VG STATE: active PP SIZE: 128 megabyte(s)
VG PERMISSION: read/write TOTAL PPs: 1092 (139776 megabytes)
MAX LVs: 256 FREE PPs: 730 (93440 megabytes)
LVs: 12 USED PPs: 362 (46336 megabytes)
OPEN LVs: 11 QUORUM: 1
TOTAL PVs: 2 VG DESCRIPTORS: 3
STALE PVs: 0 STALE PPs: 0
ACTIVE PVs: 2 AUTO ON: yes
MAX PPs per VG: 32512
MAX PPs per PV: 1016 MAX PVs: 32
LTG size (Dynamic): 256 kilobyte(s) AUTO SYNC: no
HOT SPARE: no BB POLICY: relocatable

Thanks again

shockneck · August 4, 2008, 5:53pm

right, your lv 80 PP big, is located on one disk. Use

 # lslv -l Processlv

to find out on which disk the LV is. Let us assume that it is placed on hdisk0 in your two disk rootvg. So it needs to be mirrored to the other, the second disk in rootvg assumedly hdisk1.

 # mklvcopy Processlv 2 hdisk1

This should do.

lo-lp-kl · August 5, 2008, 12:09pm

Thanks again shockneck

It works perfect

$ lsvg -l rootvg
rootvg:
LV NAME TYPE LPs PPs PVs LV STATE MOUNT POINT
hd5 boot 1 2 2 closed/syncd N/A
hd6 paging 4 8 2 open/syncd N/A
hd8 jfs2log 1 2 2 open/syncd N/A
hd4 jfs2 16 32 2 open/syncd /
hd2 jfs2 55 110 2 open/syncd /usr
hd9var jfs2 12 24 2 open/syncd /var
hd3 jfs2 12 24 2 open/syncd /tmp
hd1 jfs2 12 24 2 open/syncd /home
hd10opt jfs2 12 24 2 open/syncd /opt
lg_dumplv sysdump 16 16 1 open/syncd N/A
sdump_lv sysdump 16 16 1 open/syncd N/A
Processlv jfs2 80 160 2 open/syncd /opt/IBM

Im only have a question. when I type lslv for example hd4. I got

$ lslv -l hd4
hd4:/
PV COPIES IN BAND DISTRIBUTION
hdisk0 016:000:000 100% 000:000:016:000:000
hdisk1 016:000:000 100% 000:000:016:000:000

and in the processlv I got

$ lslv -l Processlv
Processlv:/opt/IBM
PV COPIES IN BAND DISTRIBUTION
hdisk0 080:000:000 5% 076:004:000:000:000
hdisk1 080:000:000 55% 036:044:000:000:000

There is no problem for the differences, because I think in the processlv have to be 100%

Thanks for your comments in advance

shockneck · August 5, 2008, 12:36pm

Are you concerned because of the "low" percentage value? Well, that is just an indicator how good your LV matches its position on the disk according to its definition. E.g. AIX uses ranges on disks: edge-middle-center-inner_middle-inner_edge with a preference to use center and middle areas first (to reduce movement of read-write heads). If you define that an LV has to be placed in center and all PP fit in there you get the 100%. If some or all PP in center area are taken already your LV goes somewhere else and the percent value is getting smaller.
With SAN storage this is of no interest. It may be of interest on SCSI disks e.g. in most cases for reasons of performance. One can change the LV's properties with chlv and run a reorgvg to make it look "nicer" but as long as the LV's location on the local disks does not impact performance in a bad way I'd just leave it alone.

lo-lp-kl · August 5, 2008, 1:20pm

Thank you very much Shockneck

lo-lp-kl · August 6, 2008, 7:35pm

Hello

I have a new problem with mirror rootvg

I need to do the same thing on others servers. In one of these I do the same with no problem, but in another fs on the same server I got this message

lsvg -l rootvg
rootvg:
LV NAME TYPE LPs PPs PVs LV STATE MOUNT POINT
hd5 boot 1 2 2 closed/syncd N/A
hd6 paging 16 32 2 open/syncd N/A
hd8 jfs2log 1 2 2 open/syncd N/A
hd4 jfs2 16 32 2 open/syncd /
hd2 jfs2 46 92 2 open/syncd /usr
hd9var jfs2 16 32 2 open/syncd /var
hd3 jfs2 16 32 2 open/syncd /tmp
hd1 jfs2 86 172 2 open/syncd /home
hd10opt jfs2 99 198 2 open/syncd /opt
lg_dumplv sysdump 16 16 1 open/syncd N/A
mksysblv jfs2 79 158 2 open/syncd /mksysb
fslv00 jfs2 55 55 1 open/syncd /software
IBMIHS jfs2 64 128 2 open/syncd /opt/IBM
qand > mklvcopy fslv00 2 hdisk1
0516-404 allocp: This system cannot fulfill the allocation request.
There are not enough free partitions or not enough physical volumes
to keep strictness and satisfy allocation requests. The command
should be retried with different allocation characteristics.
0516-1517 : Failed to create a valid partition allocation.
0516-842 : Unable to make logical partition copies for
logical volume.
>

Thanks again for your tips.

Greetings

bakunin · August 6, 2008, 8:10pm

Sorry, lo-lp-kl, but this really takes the biscuit: what is ununderstandable in an error message which lists the reason of why and how a command failed with painful clearness?

You have a (one or more) mirrored LV, which properties perhaps say "each copy on a separate disk" (which makes sense, because two copies of one LP on the same disk would both be lost once the disk fails) and one of these disks does not have enough free PPs to increase the LV in size. Install an additional disk (or instead change the disk for a bigger one), add it to the VG (see "man extendvg"), and try again.

On a personal note: PLEASE read a bit about the Logical Volume Manager and try to understand its concepts. Everybody, regardless of knowledge or experience, is welcome here and indeed we are gladly trying to accomodate even the most "newbiest" of newbies but asking the equivalent of "what does 'disk full' mean" is supposedly slightly overdoing it.

I hope this helps.

bakunin

lo-lp-kl · August 7, 2008, 8:49pm

Thanks for the comments bakunin

I agree with you but sometimes we have to do somethings in the fly and dont have to much time to read the books.

I resolve the problem with the mklvcopy. I need to type the command with the hdisk0 because the fs was created on the hdisk1.

The mirror was created but when I try to syncvg -v rootvg nothing happens

I got this

LV NAME TYPE LPs PPs PVs LV STATE MOUNT POINT
hd5 boot 1 2 2 closed/syncd N/A
hd6 paging 24 48 2 open/syncd N/A
hd8 jfs2log 1 2 2 open/syncd N/A
hd4 jfs2 16 32 2 open/syncd /
hd2 jfs2 77 154 2 open/syncd /usr
hd9var jfs2 12 24 2 open/syncd /var
hd3 jfs2 12 24 2 open/syncd /tmp
hd1 jfs2 12 24 2 open/syncd /home
hd10opt jfs2 12 24 2 open/syncd /opt
lg_dumplv sysdump 16 16 1 open/syncd N/A
Websphere jfs2 80 160 2 open/stale /opt/IBM
paging00 paging 24 48 2 open/syncd N/A

I try also with syncvg -l Websphere and also with varyonvg rootvg but the same thing nothing happens.

Thanks for your tips