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Examine hdisk LV layout with readvgda
JUDGING A DISK BY ITS COVER When you have an hdisk and are wonderig what it might be used for, you can use the readvgda command. This displays all sorts of helpful infomation about the Volume Group Descriptor Area (VGDA) which is on every hdisk that belongs to a volume group. It's the sort of information you'd expect to get from the LVM commands such as lslv and lspv , with this difference: the volume group doesn't need to be varied on for you to inspect its VGDA. You can even run readvgda on the VIO server to see what logical volumes are... [More]
Tags: volume_group_descriptor aix lslv lun lspv disk hdisk volume vgda lvm pp_size group lsvg readvgda |
Low-impact database clone with splitvg
"Slow = OK, but keep the downtime down" I had to make a copy of a production Oracle database so it could be used on a new LPAR. Following Chris Gibson's post on the splitvg command , I decided that splitvg was the way to go. I did have other options, such as SAN cloning or restoring from backup, but the business owner was happy to do the clone by using software mirroring and then splitting the mirror. The software mirror was from the existing RAID array (on SAN) to a second RAID array. (That's what I call redundancy). The business... [More]
Tags: aix clone volume group splitlvcopy database splitvg |
Creating JFS2 file systems? Not so fast!
Often in SMIT you can use the default settings, but when it comes to creating Enhanced Journalled File Systems – better known as JFS2 – there are three options which you’ll probably want to change from the defaults. Of course you need to set the MOUNT POINT, but the other three I like to change are: Mount AUTOMATICALLY at system restart? yes (and why wouldn’t you?) Logical volume for Log: INLINE Allow internal snapshots? yes SMIT aside: Tab Toggles In SMIT, when you have a choice between two options, such as yes and no , you can hit the Tab key... [More]
Tags: jfs crfs mkfs volume lv logical jfs2 system snapshot mount chfs journaled file performance inline cio enhanced |
