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I am looking for a way to see what the current blocksize of an filesystem is.

Normaly i would use tune2fs -l | grep "Block size", but that doesn't work on vxfs. I googled a bit and found fstyp -v /dev/vx/dsk/... (VxFS_Block_Size), but there is no fstyp installed.

So now im wondering if there is something else to find out the block size of an vxfs filesystem.

System: VxFS on RHEL 5.8

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  • Have you tried this: mkp.net/fstyp ? Commented Feb 26, 2014 at 10:46

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You can check the blocksize by reading the superblock, thats what essentially the fstyp -v /dev/vx/dsk/... would be doing.

But as you say fstyp is not installed, there is alternative to read superblock.

fsdb -t vxfs /dev/vx/dsk/...
> 8192B.p S | grep bsize
bsize  1024 ...

PS: It is not really recommended to read the blocks of filesystem metadata with fsdb, if you unknowingly write anything to these blocks; fullfsck would be set and there would be fair chances of data corruption.

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Under Linux the full command is:

/opt/VRTS/bin/fstyp -v /dev/vx/dsk/group11/vol11
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  • I already said that i found "fstyp -v /dev/vx/dsk/" and that i was looking if there is something else ... Commented Sep 25, 2015 at 9:30

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