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change LTG for rootvg
- Thread starter amalou
- Start date
MoshiachNow
IS-IT--Management
Normally ,to do so you need to varyoffvg your VG.
rootvg can not be unmounted ...
You chance to change LTG is on rootvg creation.
Also,some note from IBM:
When active MWC is being used, system performance can be adversely affected. Adverse effects are caused by the overhead of logging or journaling that a Write request in which a Logical Track Group (LTG) is active. The allowed LTG sizes for a volume group are 128 K, 256 K, 512 K, and 1024 K, with the default size as 128 K.
Note:
"To have an LTG size greater than 128 K, the disks contained in the volume group must support I/O requests of this size from the disk's strategy routines. The LTG is a contiguous block contained within the logical volume and is aligned on the size of the LTG. This overhead is for mirrored Writes only."
Long live king Moshiach !
rootvg can not be unmounted ...
You chance to change LTG is on rootvg creation.
Also,some note from IBM:
When active MWC is being used, system performance can be adversely affected. Adverse effects are caused by the overhead of logging or journaling that a Write request in which a Logical Track Group (LTG) is active. The allowed LTG sizes for a volume group are 128 K, 256 K, 512 K, and 1024 K, with the default size as 128 K.
Note:
"To have an LTG size greater than 128 K, the disks contained in the volume group must support I/O requests of this size from the disk's strategy routines. The LTG is a contiguous block contained within the logical volume and is aligned on the size of the LTG. This overhead is for mirrored Writes only."
Long live king Moshiach !
- Thread starter
- #3
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