[Lustre-discuss] crc32 is only checksum avail?

[Andrus, Brian Contractor]

All,

I am using the lustre-2.2.0-2.6.32_220.4.2.el6_lustre.x86_64.x86_64 rpms downloaded from whamcloud.

I checked the checksums on our system and find:
lctl get_param osc.*.checksum_type
osc.WORK-OST0000-osc-MDT0000.checksum_type=[crc32]
osc.WORK-OST0001-osc-MDT0000.checksum_type=[crc32]
osc.WORK-OST0002-osc-MDT0000.checksum_type=[crc32]
osc.WORK-OST0003-osc-MDT0000.checksum_type=[crc32]
osc.WORK-OST0004-osc-MDT0000.checksum_type=[crc32]
osc.WORK-OST0005-osc-MDT0000.checksum_type=[crc32]
osc.WORK-OST0006-osc-MDT0000.checksum_type=[crc32]
osc.WORK-OST0007-osc-MDT0000.checksum_type=[crc32]
osc.WORK-OST0008-osc-MDT0000.checksum_type=[crc32]
osc.WORK-OST0009-osc-MDT0000.checksum_type=[crc32]
osc.WORK-OST000a-osc-MDT0000.checksum_type=[crc32]
osc.WORK-OST000b-osc-MDT0000.checksum_type=[crc32]
osc.WORK-OST000c-osc-MDT0000.checksum_type=[crc32]
osc.WORK-OST000d-osc-MDT0000.checksum_type=[crc32]

Ok, so I understand crc32 is not the best, so I want to change it to adler.
#echo adler > /proc/fs/lustre/osc/WORK-OST0000-osc-MDT0000/checksum_type
-bash: echo: write error: Invalid argument

Hmm? Is there something more to this? I would think the packages provided would have both checksum types available.



Brian Andrus
ITACS/Research Computing
Naval Postgraduate School
Monterey, California
voice: 831-656-6238