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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]
Tags: filesystems geek_of_the_week jfs2 mount |
AIX 5.4? Old Geek, new tricks
AIX 5.4? That's got to be a typo, right? I sprang upon two references to AIX 5.4 in official IBM documentation: The first is from the Performance Tools Guide and Reference : The information contained in this book pertains to systems running AIX 5.4 or later. Any content that is applicable to earlier releases will be noted as such. The second is from the documentation about Enhanced JFS (JFS2): Support for datasets has been integrated into JFS2 as part of AIX Version 5.4 . As I recall, AIX 5.4 was the name of the new release... [More]
Tags: jfs2 aix geek_party_tricks version_5.4 |
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]
Tags: logical_volume file_system nolog performance recovery restore aix fast_write mount enhanced_journaled_file_s... jfs 6.1 jfs2 inline |
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: crfs jfs volume mkfs lv logical jfs2 system snapshot mount chfs journaled file performance inline cio enhanced |
Sizing up your file system space (and your worth)
YOUR TIME IS PRECIOUS! When you need to increase a file system, you can use our old friend smitty. But stepping through the SMIT menus could take a good 3 seconds (at least!) And as a good AIX guru, your time is precious. In a perfect world AIX gurus like you should charge your time by the nanosecond! (Just go tell your boss that the bloke who writes AIX Down Under said so.) Alas, the world is not perfect, as you may have discovered after that friendly chat with the boss. Even so, you can save a few seconds when you have to increase a file... [More]
Tags: system decrease jfs2 disk nanoseconds guru chfs gigabyte space lv increase logical_volume aix jfs precious block_size file |
