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тАО10-18-2004 08:20 AM
тАО10-18-2004 08:20 AM
LV PE Disk Disk
-----------------------------------
lvol1 - 75 1 3
lvol2 - 512 1 3
lvol3 - 75 1 3
lvol4 - 2500 1 3
lvol4 - 2500 2 4
lvol5 - 125 1 3
lvol6 - 500 1 3
lvol7 - 500 1 1
lvol8 - 512 2 4
Is there a way I can I extend the first 2500 PEs of lvol4 to the 1st mirror (disk 3) and the 2nd 2500 PEs onto the 2nd mirror (disk 4)?
Solved! Go to Solution.
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тАО10-18-2004 05:02 PM
тАО10-18-2004 05:02 PM
Re: mirroring vg00 with /opt spread across 2 disk
Unless you specify extent-based striping (distributed allocation policy), I believe that lvextend allocates available extents from the first PV on the list, until they are gone, and then starts allocating extents from the next PV on the list. If you put the PVs in the correct order on the command line, I'm pretty sure you'll end up with things as you're requesting.
This is from the 'lvcreate' man page...
...
When the distributed allocation policy is turned off, all available free extents are allocated from each available physical volume before proceeding to the next available physical volume. This is the default.
...
I hope this is helpful. You've certainly helped me, by reminding me of another reason to never have more than two PVs in 'vg00', the primary and the mirror, and let the extents fall where they may...
Regards, --bmr
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тАО10-18-2004 05:17 PM
тАО10-18-2004 05:17 PM
Re: mirroring vg00 with /opt spread across 2 disk
When mirroring, LVM will write until it runs out of space before moving on to the next disk with free extents. You will only get it to work properly if disk 1 currently has no free extents. Once you have made disk 3 bootable, mirror all the lvols in order to disk 3 (supply the PV in the command line) then mirror lvol4 giving it the PV's in the order that you want them to be used:
lvextend -m 1 /dev/vg00/lvol4 /dev/dsk/
LVM will mirror up to the end of disk3 and will then move on to disk4.
Regards
Iain Ashley
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тАО10-19-2004 12:22 AM
тАО10-19-2004 12:22 AM
Re: mirroring vg00 with /opt spread across 2 disk
I was able to put all of the lvols back, although not necessarily in the correct order. I put lvols1-3,5-7 on the first mirror disk, create a 53PE lvol to "reserve" the space that is unused on the first primary disk, then create lvol4 with 2500PE on the first mirror disk and 2500 on the second mirror disk.
And I agree, 2 mirrored primary disks - is a pain.
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тАО10-19-2004 11:55 AM
тАО10-19-2004 11:55 AM
SolutionI just want to clarify that when you replace a mirrored root disk, that once you get the config restored to it, you will need to reduce it from the VG entirely so that you can make it bootable. This is very important because if you just do a vgcfgrestore, you will not be able to boot from the disk if you lose the primary!
Also the layout of the mirrors is more or less irrelevant with some noteable exceptions. root and stand MUST be the first and second lvols on the boot disk! Beyond that the lvols can fall where they may. If you create two physical volume groups (PVG) this will help you keep the mirrors across controllers.
Here is the correct procedure for replacing a mirrored root disk (sorry if you know this already, but I find that it catches a lot of people out):
#Restore the VGRA to the disk
vgcfgrestore -n vg00 /dev/dsk/cXtXdX
#this will probably return a pv error, but if it says that the config has been restored it's ok
#update the list of active volumes
vgchange -a y vg00
#reduce disk from all lvols. When reducing lvol4 you will have to specify both PVs.
lvreduce -m 0 /dev/vg00/lvol(1-4) /dev/dsk/cXtXdX
#Remove the disk from VG00
vgreduce vg00 /dev/dsk/cXtXdX
#Now start again by properly creating the PV with a BDRA
pvcreate -Bf /dev/rdsk/cXtXdX
#Make it bootable
mkboot /dev/rdsk/cXtXdX
#Set the autofile so you can boot without quorum (if you lose a controller). You may want to repeat this on the primary disk also
mkboot -a "hpux -lq" /dev/rdsk/cXtXdX
#Add the disk back into vg00
vgextend vg00 /dev/dsk/cXtXdX
#Create your PVGs
#see the manpage for lvmpvg for the format, but the /etc/lvmpvg file should look similar to this:
VG vg00
PVG primary
/dev/dsk/c1t0d0
/dev/dsk/c1t1d0
PVG alternate
/dev/dsk/c2t0d0
/dev/dsk/c2t0d1
# Now you can start mirroring.
#***IMPORTANT*** You must mirror lvol1 lvol2 lvol3 in order - wait for each to complete before starting the next.
lvextend -m 1 /dev/vg00/lovl1 /dev/dsk/cXtXdX
#when you get to lvol4 specify both PVs or the PVG, doesn't matter
#finally, register the bootdisk with:
lvlnboot -Rv
#you should see your newly mirrored boot disk in the list (excluding dump)
Regards
Iain Ashley