HP-UX Reference (11i v2 03/08) - 1M System Administration Commands A-M (vol 3)

l
lvchange(1M) lvchange(1M)
following values:
y Set mirror consistency recovery on. LVM achieves mirror con-
sistency during volume group activation by going through all logical
extents and copying data from a nonstale copy to the other mirror
copies.
n Set mirror consistency recovery off. LVM does not perform mirror
consistency recovery on this logical volume when the volume group
is activated.
-C contiguous Set the contiguous allocation policy. contiguous can have one of the fol-
lowing values:
y Set a contiguous allocation policy. Physical extents are allocated in
ascending order without any gap between adjacent extents and all
extents are contained in a single physical volume.
n Do not set a contiguous allocation policy.
A nonempty logical volume that has a noncontiguous allocation policy
cannot be changed to a contiguous allocation policy unless it happens to
meet all the requirements of the contiguous allocation policy. See
lvcreate (1M) for more information about the contiguous allocation policy.
-d schedule Set the scheduling policy when a logical extent with more than one mir-
ror is written. (The scheduling policy of a striped logical volume is
striped and cannot be changed.) schedule can have one of the following
values:
p Establish a parallel scheduling policy.
s Establish a sequential scheduling policy. Use this value with care,
because it leads to performance loss in most cases.
-D distributed Change the distributed allocation policy. distributed can have one of the
following values:
y Turn on distributed allocation.
n Turn off distributed allocation.
f Force distributed allocation to be on.
When the distributed allocation policy is turned on, only one free extent
is allocated from the first available physical volume. The next free
extent is allocated from the next available physical volume. Allocation of
free extents proceeds in round-robin order on the list of available physi-
cal volumes.
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.
The distributed allocation policy REQUIRES the PVG-strict allocation
policy (
-s g ) to ensure that mirrors of distributed extents do not over-
lap (for maximum availability).
The distributed allocation policy is incompatible with the striped
scheduling policy (
-i stripes ) and the contiguous allocation policy ( -C
y ).
See lvcreate (1M) for more information on the distributed allocation pol-
icy.
The
-D y option will fail if the existing logical volume has any two con-
secutive logical extents on the same physical volume. To override this
failure, use the -D f option.
If a logical volume with the distributed allocation policy has at least two
consecutive logical extents on the same physical volume, then
lvdisplay (1M) will display the allocation as
partially-
distributed (vs. distributed).
Section 1M−−386 Hewlett-Packard Company − 2 − HP-UX 11i Version 2: August 2003