regarding fs_async kernel parameter

[ran_li]

Hello all,

from previous post I understand this kernel parameter(fs_async) is for HFS not for vxfs/JFS/raw device. The questions are

1. if I m using HFS, is there a way to control the file system sync/async individually, e.g. /tmp can be set to async while /d1 can be set to sync?

2. how does vxfs/JFS control the sync/async behavior, again can it control the file system separately(like the question above)?

Thanks!

[Pete Randall]

See the man pages for mount_hfs and mount_vxfs.


Pete

[Deoncia Grayson_1]

also you can puruse this document for more facts:

http://docs.hp.com/en/TKP-90202/re22.html

[ran_li]

Thanks for the reply.

man mount_vxfs says

NOTE: The convosync option is available only
with the HP OnLineJFS product.

but I m not sure if onlineJFS and vxfs is the same thing with different name or ...

thanks for any comments!

[ran_li]

And by the way, how can I tell the file system version for the existing vxfs? Thanks!

[ran_li]

fstyp -v /dev/vg00/lvol3

[Bill Hassell · Accepted solution]

Online JFS is a special product that must be purchased. It adds several options to the mount command for VxFS as well as the ability to resize VxFS filesystems without unmounting them (most of the time). Use swlist to see if Advanced JFS (Online JFS) is present:

swlist -l bundle | grep -i jfs

JFS (Journaled File System) is another name for VxFS.