topic Re: Vxfs and Intentlog in Operating System - HP-UX

Vxfs and Intentlog

Sagar Sirdesai — Tue, 19 Apr 2011 15:24:56 GMT

Hi
I'm trying understand what is a intentlog.
Does intentlog contains all the information of changes intended to the super block.

Re: Vxfs and Intentlog

Mel Burslan — Tue, 19 Apr 2011 15:52:23 GMT

Have you tried googling it ??

http://www.google.com/search?q=vxfs+what+is+intentlog

the first link google brings up, tells you pretty much what you need to know:

http://sfdoccentral.symantec.com/sf/5.1/aix/html/vxfs_admin/ch01s02s03s01.htm

Re: Vxfs and Intentlog

P Arumugavel — Tue, 19 Apr 2011 15:53:56 GMT

hi,

Go through below docs.

http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c02057264/c02057264.pdf

Rgds...

Re: Vxfs and Intentlog

Sagar Sirdesai — Tue, 19 Apr 2011 15:56:51 GMT

is intentlog memory based or disk based.

Re: Vxfs and Intentlog

Mel Burslan — Tue, 19 Apr 2011 16:00:33 GMT

Is this a homework question ? If it is memory based and your computer crashed, how is the intentlog be useful to you ? Just think about it for a minute, huh ?

Re: Vxfs and Intentlog

Ismail Azad — Wed, 20 Apr 2011 06:52:55 GMT

Hi sagar,

Pending metadata transaction is the terminology you are looking for. When your system crashes, intent log allows for "fast file system recovery" which was the major drawback of the HFS filesystem which did not maintain file system integrity after an outage.

Sometimes on an HFS filesystem, the whole data has to be recovered from tape. Vxfs or JFS where J refers to the journal or the intent log avoids such difficult situations and can be extremely useful at times of power outages. The intent log is also referred to as a "circular log".

Regards
Ismail Azad