Vxfs and Intentlog

[Sagar Sirdesai]

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

[Mel Burslan]

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

[P Arumugavel]

hi,

Go through below docs.

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


Rgds...

[Sagar Sirdesai]

is intentlog memory based or disk based.

[Mel Burslan]

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 ?

[Ismail Azad]

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