Re: [ADSM-L] backup performance on intel server
2009-04-30 14:28:03
1 Gb Ethernet is about 100Mb/sec
LTO4 is about 120Mb/sec + compression
A good SCSI or FC drive is good for about 100Mb/sec
Assuming you can stream 3 threads across the Ethernet, you will not be able to
keep the 3 LTO4 drives busy because of the network. The faster tape drives
were not intended to take data from the Ethernet.
Assuming some sort of RAID and careful selection of file system backup times
the disk can keep up with the network if the read is sequential and the backup
software can find the data fast enough.
Make sure you have multiple busses. Basically I would look for a PCI-Express
system with enough slots for the Ethernet and RAID or HBA controllers.
I would be stressed about making the window and since you are using a
traditional backup solution the fulls will be tough.
Andy Huebner
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Stef Coene
Sent: Thursday, April 30, 2009 1:04 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] backup performance on intel server
Hi,
I have a non-TSM related question, but I think it is the same for all backup
software.
We need to backup 28 TB for a cutsomer with daily changes of appr 8 TB. If
you take a backup window of 8 hr, this is 1 TB/hour. This is also 280 MB/s
so 3,5 LTO4 tape streamers (if you take 80MB/s per tape streamer).
I can not use SAN backup, so all data has to come in over the network, so I
need at least 3 x 1 GB network connections.
What kind of intel box running windows can handle this workload? Is the PCI
bus of a normal x86 server enough or do I need some high end x86 hardware?
Stef
PS: the backup software Backup Exec from Symantec ........
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