Air Cleaner User Manual

continue to be created in the general location as defined by the physical
volume list, Intra-policy and Inter-policy.
MWC?
Indicates whether or not the mirror-write-consistency checking is in effect. If
so, the volume group status area is updated when writes are performed to
a mirrored logical partition. This status is then used, in the case of a disk
or system failure, to ensure that all mirrored partitions are identical when
the volume group is again varied on. Turning off the MWC increases I/O
performance when writing to mirrored logical volumes, but requires you to
resynch all mirrors in their entirety in case of an unexpected system halt to
ensure all data between the mirrors is consistent.
y Specify this option to turn on active mirror write consistency
which ensures data consistency among mirrored copies of a logical
volume during normal I/O processing.
P Specify this option to turn on passive mirror write consistency
which ensures data consistency among mirrored copies during
volume group synchronization after a system interruption.
Note: This option only applies to backups created on systems
running AIX 5.1 or later.
n Specify this option when you do not want to enable mirror write
consistency for this logical volume.
This field has no effect for single copy (unmirrored) logical volumes.
Write-verify?
Indicates whether a read is performed after every write to ensure the data
was written properly. Turning on this attribute decreases the I/O
performance when writing to a logical volume but provides higher
assurance that data was written properly and is readable. Enter “y” or “n”
to change the value.
Bad block relocation?
Indicates whether the software should relocate data in bad blocks when a
write error occurs. This action is normally taken by the disk hardware, but
the hardware might not have this feature or might not have enough space
for the number of blocks to relocate. Turning on this value does not affect
I/O performance. To change this value, enter “y” or “n”.
Relocatable?
Indicates whether or not this logical volume can be moved to a new
location when a volume group is reorganized using the AIX reorgvg or
migratepv command. If you do not want to enable this logical volume to
relocate, enter “y” in this field.
Schedule Policy?
This option changes the scheduling policy when more than one logical
partition is written.
p (Parallel)
Specify this option to establish a parallel scheduling policy.
s (Sequential)
Specify this option to establish a sequential scheduling policy.
ps (Parallel Sequential)
Specify this option to establish a parallel write with sequential read
Chapter 11. Changing the Volume Group, Logical Volume and Filesystem Attributes 11-15