Skip to Main Content
Forums

Infrastructure Software

Announcement

For appeals, questions and feedback about Oracle Forums, please email oracle-forums-moderators_us@oracle.com. Technical questions should be asked in the appropriate category. Thank you!

Physical disk IO size smaller than fragment block filesystem size ?

rarFeb 9 2013 — edited Feb 10 2013
Hello,
in one default UFS filesystem we have 8K block size (bsize) and 1K fragmentsize (fsize). At this scenary I thought all "FileSytem IO" will be 8K (or greater) but never smaller than the fragment size (1K). If a UFS fragment/blocksize is allwasy several ADJACENTS sectors on disk (in a disk with sector=512B), all "physical disk IO" it will allways, like "Filesystem IO", greater than 1K.

But with dtrace script from DTrace Toolkit (bitesize.d) I can see IO with 512B size.

¿What is wrong in my assumptions or what is the explanation?

Thank you very much in advance!!
Comments
Locked Post
New comments cannot be posted to this locked post.
Post Details
Locked on Mar 10 2013
Added on Feb 9 2013
#kernel, #oracle-solaris
2 comments
1,956 views