[Lustre-discuss] ost_brw_write()

[Mag Gam]

Brian. Thanks for getting back to me.

Yes. The contents matched but getting the RX drop which is king of
scary. I am using the same machine when doing the test.

I have already looked at the Lnet tests

http://manual.lustre.org/manual/LustreManual16_HTML/LustreIOKit.html#50642990_pgfId-1290255

For some reason, "lst add_group servers ipaddrs_of_OSS_and_MDS" gets
me a RPC error but it seems my 5 servers get added. Wierd. Is there
better documentation or perhaps an example for the lnet tests I am
curious to try it.

BTW, I am very happy to see this
http://manual.lustre.org/manual/LustreManual16_HTML/LustreTuning.html#50642992_24952
(Last section regarding CRC). Where can I read more about this??



Keep in mind, I am using e1000 NICs, and I think there is some tuning
I should be doing (but I am not certain if I am doing the right
tuning)

TIA









On Fri, Nov 14, 2008 at 7:11 AM, Brian J. Murrell <Brian.Murrell at sun.com> wrote:
> On Thu, 2008-11-13 at 21:32 -0500, Mag Gam wrote:
>> OK.
>>
>> It seems Lustre FS is dropping the packets.
>
> No.  Nobody said anything about packets being dropped.  They are failing
> checksum.
>
>>  I did multiple FTPs and
>> they were very large files (10GB each), and no packet drops
>
> Did you verify the contents of what you ftp'd matched the original?  Are
> you using the same machines in your ftp tests that are reporting
> checksum failures with Lustre?
>
> You might want to look in our test suite and see if there is a checksum
> unit test.  I'd be surprised if there is not.  Maybe run that and see
> what the results are.  I'm afraid I don't have a lustre source tree very
> handy at the moment to check for you.
>
> b.
>
>
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