On 01/08/14 20:17, Crowe, Tom wrote:
All,
We have been working with robin hood 2.4.3 for 2-3 months now, and we
are not getting the numbers that we expected from the rbh-reports. Our
filesystem has about 1.4 TB of data in flight and we have never gotten
robin hood to report on more than a few hundred TB.
We are running Lustre 2.1.6, and have RBH 2.4.3 installed from RPM's
(tmpfs and adm).
We have enabled the change log processing from an admin client (no
root squash) and that seems to be parsing the changlog correctly. The
filesystem was populated with data before robin hood was installed. So
we have been trying to run a "catch up" scan from the same admin
client (while the change log reader is processing). Please note this
admin client is NOT running on the MDS and is running lustre 2.1.3
Indeed, this is the recommended setup: robinhood is to run on a client,
not on the MDS.
The issues we have experienced are mainly hung scans, hung clients
(mount hangs up on admin client), and ultimately, incomplete/incorrect
data in the RBH database.
Is it "OK" to run the change log reader AND the scan from the same
admin client?
Yes, it is supported to run both at the same time.
However, I suggest you first complete the initial scan (while your
changelogs keep stacking), and then process the changelog once the scan
is completed,
this way you will speedup the scan by offloading the DB.
Is there anything we can do to assist the scan in completing correctly?
Your issues sound like lustre client issues. When the client is hung,
dmesg sometimes show the current stuck process and dumps its stack.
Else, try to dump your node and see where it was stuck.
Also see the previous discussion in the mailing list "Slab memory usage
during initial robinhood scan" to check if you don't have a similar problem.
If you have no hope to fix the client hangs, you can consider splitting
the scan using '--partial-scan' option (rbh 2.4)
so you can progressively complete the scan step-by-step, and only have
to restart the current and remaining parts if your client hangs.
Regards,
Thomas
Thanks for your assistance.
-Tom
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