I have three pieces of 10GBE related feedback, which may be a bit
tangential or redundant.
1) Don't assume that the average OS network stacks are going to make
efficient use of or good throughput on 10GBE. Insofar as filers also run
an OS, its not a given that they will perform at peak form either. (This
may have changed since I worked with 10GBE three years ago, but I would
document your assumptions, and document nominal throughput wherever you
can just for the insight you'll gain.)
2) Don't assume that any two different models/brands of 10GBE NICs
supplied by the same platform vendor for use with the same OS are going to
perform alike. Also, don't assume that GA firmware isn't crap because its
the only version available.
3) Look for an ugly knee in the throughput curve as you approach full
scaleout of the 10GBE switches. I've seen at least one workgroup network
switch that ran short on an internal resource as more than three quarters
of the network ports were in use. Likely a thing of the past as well.
[RC]
From:
James R Owen <Jim.Owen AT YALE DOT EDU>
To:
ADSM-L AT VM.MARIST DOT EDU
Date:
05/05/2010 04:37 AM
Subject:
[ADSM-L] ? linux TSM 6.2 using 10GE iSCSI ... to backup HPC ?
Sent by:
"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
?Are you: doing TSM backups to iSCSI disk/tape? w/10GE? w/TSM6.?
Scanning ADSM-L archives, actual TSM experience w/iSCSI seems scarce!
Recently, Gary Bowers recommends "DirectIO No" in dsmserv.opt w/ iSCSI,
and in 2007 Ben Bullock had iSCSI poor performance (w/o that setting?)
Most other iSCSI threads are questions answered by theory/opinion.
We hope to backup HPC (primarily Gene Sequencing Experiments) w/TSM 6.2.
HPC infrastructure:
RHEL linux clusters using Panasus PanFS iSCSI disk array
via 10Gb ethernet
To best integrate TSM into their infrastructure, the HPC group wants to
backup to iSCSI disk/tape storage via 10GE w/ TSM v6.2 running on RHEL.
Our current TSM experience is w/ AIX6.1, TSMv5.5.4.2, FC disk/tape,
so we're really trying to "shoot the moon" w/ this new HPC TSM config.
!But, hey! It's all going to be new, so why not ...totally different?
Please advise, if you have relevant experience/facts,
(or theories/opinions, as you believe appropriate;-)
FYI, here's how we hope this can work:
Because TSM does not support Panasus PanFS, we will use tar to copy
completed GeneSeqExprmnts onto (iSCSI) EXT3 FS space @ RHEL linux
hosting both TSM 6.2 server and client. TSM client will backup
GSE tarballs from EXT3 FS w/ dsmc incremental via ShrMem to TSM 6.2
server, directly onto (iSCSI) LTO5 tape w/compression. Other PanFS
volumes will backup via dsmc incremental from NFS mounts @ TSM client
via ShrMem to (iSCSI) sequential file STGpool space w/ dedup enabled.
(We also hope to use TSM client dedup effectively!-)
Thanks for any advice!
--
Jim.Owen AT Yale DOT Edu (w#203.432.6693, c#203.494.9201, h#203.387.3030)
U.S. BANCORP made the following annotations
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