Could paging space increases be simplified?On AIX, changing a file system size is a breeze. Here's how to increase the /myfs file system by 1 GB: chfs
-a size=+1G /myfs And you can decrease it - on the fly - using a minus sign. Let's reduce it by 750 MB: chfs -a Y With paging space, it's a little less user-friendly. To increase paging space (which, let's face it, is the usual direction we want to go), it's chps -s. To decrease, it's chps -d. This will increase paging00 by 8 Physical Partitions: chps -s 8 paging00 What's so hard about that syntax? Just that it means you need to work out the size in logical partitions. That means you first have to work out the paging space name: lsps -a Page Space Physical Volume Volume Group Size %Used Active Auto Type Chksum paging00 hdisk23 pagingvg 16384MB 8 yes yes lv 0 hd6 hdisk10 rootvg 16384MB 8 yes yes lv 0 Okay. You have to know the file system name when you want to change its size, so no difference here. But the next bit gets messy: You have to find the PP (Physical Partition) size for that volume group. You can do this using the lsvg command, but the lslv command will give the information you need:
lslv paging00 LOGICAL VOLUME: paging00 VOLUME GROUP: pagingvg LV
IDENTIFIER: 00c VG STATE: active/complete LV STATE: opened/syncd TYPE: paging WRITE VERIFY: off MAX LPs: 512 PP SIZE: 256 megabyte(s) COPIES: 1 SCHED POLICY: parallel LPs: 128 PPs: 128 STALE PPs: 0 BB POLICY: non-relocatable INTER-POLICY: minimum RELOCATABLE: yes INTRA-POLICY: center UPPER BOUND: 32 MOUNT POINT: N/A LABEL: None MIRROR WRITE CONSISTENCY: off EACH LP COPY ON A SEPARATE PV ?: yes Serialize
IO ?: NO In this case, the paging00 belongs to the volume group pagingvg. The PP SIZE for that volume group is 256 megabytes. When you're changing a file system size, on the other hand, you don't need to know what volume group the logical volume belongs to. Now to increase the paging space paging00 by, say, 2 GB, you'd need to calculate that in multiples of 256 mb, which comes to 8 Logical Partitions (LPs). So to increase paging00 by 2 GB, you would run: chps -s 8 paging00 Wouldn't it be nice to be able to specify the size in GB or MB, the way you can with a file system? Wouldn't this syntax be easier: chps -a size=+2G paging00 you could leave AIX to work out how many logical partitions that comes to, just the way it works for file systems.
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Anthony English is an independent contractor who solves expensive problems for businesses running IBM Power Systems.
He has written extensively about AIX and has been recognised for his contributions and thought leadership by being named an IBM Champion for Power Systems.
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