Can I also raise a concern about your plan to write LPs from both copies spread over the same disks. What would happen if you lost hdisk3, for instance. You might end up with two copies both with some missing LPs and a lot of hard work to extricate yourself.
I've not found a mention of reducing FS size in the manual page for chfs on AIX 6. The details about the size= part are below:-
Quote:
-a size=NewSize
Specifies the size of the Journaled File System. The size can be specified in units of 512-byte blocks, megabytes or
gigabytes. If Value has the M suffix, it is interpreted to be in megabytes. If Value has a G suffix, it is interpreted
to be in gigabytes. If Value begins with a +, it is interpreted as a request to increase the file system size by the
specified amount. If the specified size is not evenly divisible by the physical partition size, it is rounded up to the
closest number that is evenly divisible.
The process to reduce the FS does work though
Code:
# lslv robin_test_lv
LOGICAL VOLUME: robin_test_lv VOLUME GROUP: rebsvg
LV IDENTIFIER: 00cfe9f500004c000000012bcecff0de.18 PERMISSION: read/write
VG STATE: active/complete LV STATE: opened/syncd
TYPE: jfs2 WRITE VERIFY: off
MAX LPs: 512 PP SIZE: 32 megabyte(s)
COPIES: 2 SCHED POLICY: parallel
LPs: 32 PPs: 64
STALE PPs: 0 BB POLICY: relocatable
INTER-POLICY: minimum RELOCATABLE: yes
INTRA-POLICY: edge UPPER BOUND: 32
MOUNT POINT: /robin_test_fs LABEL: /robin_test_fs
MIRROR WRITE CONSISTENCY: on/ACTIVE
EACH LP COPY ON A SEPARATE PV ?: yes
Serialize IO ?: NO
INFINITE RETRY: no
# chfs -a size=-32M /robin_test_fs
Filesystem size changed to 2031616
# lslv robin_test_lv
LOGICAL VOLUME: robin_test_lv VOLUME GROUP: rebsvg
LV IDENTIFIER: 00cfe9f500004c000000012bcecff0de.18 PERMISSION: read/write
VG STATE: active/complete LV STATE: opened/syncd
TYPE: jfs2 WRITE VERIFY: off
MAX LPs: 512 PP SIZE: 32 megabyte(s)
COPIES: 2 SCHED POLICY: parallel
LPs: 31 PPs: 62
STALE PPs: 0 BB POLICY: relocatable
INTER-POLICY: minimum RELOCATABLE: yes
INTRA-POLICY: edge UPPER BOUND: 32
MOUNT POINT: /robin_test_fs LABEL: /robin_test_fs
MIRROR WRITE CONSISTENCY: on/ACTIVE
EACH LP COPY ON A SEPARATE PV ?: yes
Serialize IO ?: NO
INFINITE RETRY: no
How delighted am I?
Given that you can add a PP by using chfs -a size=+1 I tried chfs -a size=-1 /test_robin_fs and got en error, which I eventually deciphered as the reduction appears to need to be given in multiples of the PP size.
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