[Veritas-bu] Vaulting images from disk = slow tape speed, ideas???
2009-07-28 13:43:55
The core is a 6905 Cisco backbone 128GB backplane... everything is on Gig
ports... the backups that went to tape came across a two nic team on the master
server and a two nic team on the media server. We have added four more nics on
each server in three teams. The DSU has 12 one gig-e connections. The data
has been strategically placed across the 12 ports/shares so all the data
doesn't come from just one system housing DSUs. The same core pushed the
muliplexed tapes drive to around 60 Gb/hr... the same amount of data is coming
in.. .now just across a wider pipe to single threaded tape drives. The data
flies going into the DSU.
Thanks,
Jim
[quote] I'm assuming you went from a media server attached to a fiber channeled
tape drive to a media server attached to a network attached disk
appliance - depending on your core backbone I would say that is your
performance degradation. How many hops to the DSU?, are the ASIC's over
subscribed?, stuff like that is where I would start
Tim Needham, Sr. Backup Engineer
Apollo Group | Information Technology | Data Protection
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From: veritas-bu-bounces < at > mailman.eng.auburn.edu
[mailto:veritas-bu-bounces < at > mailman.eng.auburn.edu] On Behalf Of jkearns
Sent: Monday, July 27, 2009 2:17 PM
To: VERITAS-BU < at > MAILMAN.ENG.AUBURN.EDU
Subject: [Veritas-bu] Vaulting images from disk = slow tape speed,
ideas???
We backup about 16Tb of data over the course of a weekend. We used to
run NBU 6.0 MP2 with four LTO3 drives fiber connected. We recently
changed to NBU 6.5.3 and a disk to disk appliance... we now vault from
the disk images (DSU) to tape for offsite storage and DR. By my
estimates the drives used to copy at roughly 62 Gb/Hr multiplexed. So
we would be finished over the course of a weekend. Now that we are
vaulting from disk to tape, the tape drives cannot multiplex from disk
to tape. My vault jobs take extremely long to finish and if a drive is
busy when the vault job begins then it only runs on the remaining
available tape drives (which for us, we have two tape storage groups
with two drives in each one based on what master/media they belong to)
so when something happens to one drive I end up copying images for half
of my environment to one tape drive. The drive non-multiplexed are
copying at about 30-35 Gb /Hr. Moving to a disk replication would solve
this but my DR
plan is a cold site so I have to keep tape. Is there anything I can
do to improve this performance?
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