topic Re: Default block size in Operating System - HP-UX

Default block size

Jerome D'silva — Sat, 21 Dec 2002 06:02:43 GMT

Hi
I would like to know the default block size on HPUX11.0 .Is it 256Kb or 512Kb or 1024Kb ?

Thanks
Jerome

Re: Default block size

RAC_1 — Sat, 21 Dec 2002 06:26:26 GMT

for hfs it is 8k

for vxfs it is 1024bytes

Re: Default block size

T G Manikandan — Sat, 21 Dec 2002 06:27:25 GMT

The default block size for vxfs,jfs and hfs are 1024K.

If you need to change the default value when creating file systems use the -b option to the newfs command.

For vxfs
# fstyp -v /dev/vg00/lvol1
f_bsize---->current block size
f_frsize--->default block size

For hfs file
systems

# tunefs -v /dev/vg00/rlvol4 | grep bsize

du reports with block size of 512 Kbytes.

File systems are created with larger block size like 8192Kbytes for good performance.

check for the man pages of newfs_vxfs for more information.

Thanks

Re: Default block size

T G Manikandan — Sat, 21 Dec 2002 06:32:45 GMT

Anil is right for hfs it is 8192 Kb.
Ofcourse the fragment size is 1k.

# tunefs -v /dev/vg00/rlvolX | grep bsize

Also you can use df -g to find the current block size and the fragment size.

Thanks

Re: Default block size

T G Manikandan — Sat, 21 Dec 2002 06:38:29 GMT

Anil is right for hfs it is 8192 Kb.
Ofcourse the fragment size is 1k.

# tunefs -v /dev/vg00/rlvolX | grep bsize

Also you can use df -g to find the current block size and the fragment size.

Thanks

Re: Default block size

Jerome D'silva — Mon, 23 Dec 2002 03:15:15 GMT

Thanks for all the inputs .I would like to know one more info .Thought I would continue with this thread itself .

We have procured a new MA8000 SAN and I would like to know what is the chunk size we need to set on the SAN in order to get optimal performance .Our application is read intensive and we have configured RAID (3/5) on it .The block size on our vxfs currently is 8192 .

Thanks
Jerome