08-09-2012
You don't have to use "mirrorlv" if the LV is mirrored already. Once you have added the new PV to the VG ("extendvg"), you have added some available PPs to the VG. If you now extend your LV ("chlv" or "chfs" - i prefer to use "chlv" first and only then "chfs") and there is no space for the mirror left on your old PVs the system will take automatically the necessary PPs from the newly added volume.
The only problem might arise if you have additional options like "superstrict" switched on or something such and the system can't allocate the missing PPs according to these rules. Remove one mirror for this LV then, run "reorgvg" to get as much contigouus space as possible and then remirror (using "mirrorlv") again. This should now work.
You can - for a maximum of control - use "lmigratepv" once you have unmirrored the LV (use with extreme caution, this is as low-level as it gets, shy from a "dd" onto the naked device) or recreate the LV using a map file altogether. Recreating the LV would mean taking it offline for some time, the other way can be done while it is running (really - done that!). Still, usually this sort of control isn't necessary and with the usual LVM controls one gets more or less what one wants.
I hope this helps.
bakunin
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LEARN ABOUT NETBSD
lvextend
LVEXTEND(8) System Manager's Manual LVEXTEND(8)
NAME
lvextend - extend the size of a logical volume
SYNOPSIS
lvextend [--alloc AllocationPolicy] [-A|--autobackup y|n] [-d|--debug] [-h|-?|--help] [-i|--stripes Stripes [-I|--stripesize StripeSize]]
{-l|--extents [+]LogicalExtentsNumber[%{VG|LV|PVS|FREE}] | -L|--size [+]LogicalVolumeSize[kKmMgGtT]} [-t|--test] [-v|--verbose] LogicalVol-
umePath [PhysicalVolumePath...]
DESCRIPTION
lvextend allows you to extend the size of a logical volume. Extension of snapshot logical volumes (see lvcreate(8) for information to cre-
ate snapshots) is supported as well. But to change the number of copies in a mirrored logical volume use lvconvert(8).
OPTIONS
See lvm for common options.
-l, --extents [+]LogicalExtentsNumber[%{VG|LV|PVS|FREE}]
Extend or set the logical volume size in units of logical extents. With the + sign the value is added to the actual size of the
logical volume and without it, the value is taken as an absolute one. The number can also be expressed as a percentage of the total
space in the Volume Group with the suffix %VG, relative to the existing size of the Logical Volume with the suffix %LV, of the
remaining free space for the specified PhysicalVolume(s) with the suffix %PVS, or as a percentage of the remaining free space in the
Volume Group with the suffix %FREE.
-L, --size [+]LogicalVolumeSize[kKmMgGtTpPeE]
Extend or set the logical volume size in units of megabytes. A size suffix of M for megabytes, G for gigabytes, T for terabytes, P
for petabytes or E for exabytes is optional. With the + sign the value is added to the actual size of the logical volume and with-
out it, the value is taken as an absolute one.
-i, --stripes Stripes
Gives the number of stripes for the extension. Not applicable to LVs using the original metadata LVM format, which must use a sin-
gle value throughout.
-I, --stripesize StripeSize
Gives the number of kilobytes for the granularity of the stripes. Not applicable to LVs using the original metadata LVM format,
which must use a single value throughout.
StripeSize must be 2^n (n = 2 to 9)
Examples
"lvextend -L +54 /dev/vg01/lvol10 /dev/sdk3" tries to extend the size of that logical volume by 54MB on physical volume /dev/sdk3. This is
only possible if /dev/sdk3 is a member of volume group vg01 and there are enough free physical extents in it.
"lvextend /dev/vg01/lvol01 /dev/sdk3" tries to extend the size of that logical volume by the amount of free space on physical volume
/dev/sdk3. This is equivalent to specifying "-l +100%PVS" on the command line.
SEE ALSO
lvm(8), lvcreate(8), lvconvert(8), lvreduce(8), lvresize(8), lvchange(8)
Sistina Software UK LVM TOOLS 2.02.44-cvs (02-17-09) LVEXTEND(8)