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Set the mount option for new file systems
When you create a file system using SMITTY, the default action is for the file system NOT to mount after a reboot. Now it might occur to you that generally when you create a file system, you probably want it to be available after a reboot. So you naturally hit the F4 key (or Esc 4 or just the Tab key) so that you can set the option to True. Here's what to do if you've forgotten that option and found your file system hasn't mounted after a reboot. From the command line: The fix is quite easy using the chfs command, and you don't need to... [More]
Marcações: filesystems geek_of_the_week jfs2 mount |
AIX LVM Protects me from my own stupidity
One of the great strengths of AIX is
the Logical Volume Manager (LVM). It may not be completely foolproof,
but it does provide quite a lot of protection from administrator
errors. Here are a few common LVM tasks that
I've deliberately attempted to make a mess of. See how the LVM
reacts (Don't Try This at Home) Let's start with three Physical
Volumes. rootvg has one PV (booting from SAN) and datavg has two PVs. # lspv hdisk0
00c5a47ecf9edd3e rootvg active hdisk1
00c5a47ed021ea7d ... [More]
Marcações: logical_volume_manager exportvg umount mount lvm varyoffvg |
Novel uses for Name File Systems
You may know that WPARs use Name File Systems for creating alternate paths for rootvg file systems. Name File Systems have been around in AIX forever, and when you think about it, they can come in handy when you want to create a second view of a subdirectory. A Name File System is a pseudo-file system - a way of making a subdirectory its own dedicated mount with its own mount attributes such as cio, read-only etc.
Even if you don't use Name File Systems for that, here are some ideas of where an alternate path can be helpful. This is from my... [More]
Marcações: file-over-file_mount namefs mount poweritpro |
VIOS: Insufficient memory, not able to complete the command
A strange "insufficient memory" error on the VIO server took a little bit of untangling. The error occurred when I logged into the VIO server command line as padmin shortly after running a backup. I was attempting to display the Virtual Media Library* contents. When I entered the lsrep command , it reported the following error: Insufficient memory, not able to complete command. I tried to list the virtual resources using the HMC GUI ( Server > Virtual Resources > Virtual Storage Management ) but it seemed to take an eternity. It... [More]
Marcações: lsrep virtual_media_repository aix storage_pool virtual_media_library vios mount rootvg mkrep unmount insufficient_memory vmlibrary |
Speed up recovery with JFS2 Filesystem NOLOG feature
IBM recently issued a Technote explaining the very handy NOLOG option which you can use when mounting JFS2 (also known as Enhanced Journaled File Systems). The NOLOG feature was added in AIX 6.1 and it only applies to JFS2, not to the older JFS. If you need to copy or restore data to a file system in a hurry, then
you could mount the target file system with the NOLOG option. This was one of three suggestions I made in an earlier post for when you need to copy data quickly, but the Technote covers the NOLOG more comprehensively than I did in... [More]
Marcações: logical_volume file_system nolog performance recovery restore aix fast_write mount enhanced_journaled_file_s... jfs 6.1 jfs2 inline |
%iowait "A misleading indicator of I/O performance"
At the IBM Power Systems Technical University in October, there was a fascinating session on Disk IO Tuning in AIX 6.1. I didn't get to see the session, but the presentation slides are well worth reading. (URL to the slides updated, Jan 24, 2017). Even if you're not running 6.1, the principles and examples will be relevant. The session had Dan Braden as its author and was presented by Steve Nasypany, and it covered topics such as: The importance of I/O tuning Disk basics and performance overview How to improve disk... [More]
Marcações: mount aix chlv chfs log=null ram_disk tuning nmon io no_logging disk topas performance iowait iostat rmfs power_systems queue_depth |
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]
Marcações: jfs crfs mkfs volume lv logical jfs2 system snapshot mount chfs journaled file performance inline cio enhanced |
