[Lustre-discuss] crc32 is only checksum avail?

[Theodoros Stylianos Kondylis]

Hello Brian,

>From my small experience I think you cannot echo on
/proc/fs/lustre/files... most probably you need some equivalent command to
change this. In lustre 2.0 Oper. Man. (19.5.1.1)
http://wiki.lustre.org/manual/LustreManual20_HTML/ManagingFileSystemIO.html
states to echo your choice. But in our 1.8.4 test cluster this doesn't
work with the exact same return

-bash: echo: write error: Invalid argument

I don't know if this is of any help to you,
Stelios.

On Mon, Jan 28, 2013 at 11:22 PM, Andrus, Brian Contractor <bdandrus at nps.edu
> wrote:

> 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
>
>
>
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>
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