For Raw Filesystems on Solaris single 250 MHz CPU should be sufficient to
backup at 50 MB/second from local disk to tape
Conservative estimate is 5 MHz of UltraSPARC CPU capacity per 1 MB/second of
data that needs to be moved. This means that for every MB/second of data
moved (whether over the network, from disk, or to tape), the system should
have 5 MHz of processing power available for the transfer. For example, a
system that needed to back up a number of clients over the network to local
tape at a rate of 10 MB/second would need 100 MHz of available CPU power.
This included 50 MHz to move data from the network to the server, and
another 50 MHz to move data from the server to the tapes. This would keep a
300 MHz UltraSPARC(TM) processor at 33% utilization. As another example, a
system that need to back up a database residing on local disks to local tape
device at a rate of 35 MB/second would need 350 MHz of available CPU power.
The actual software overhead is small, and is included in the 5 MHz per
MB/second number.
Hope this helps,
Ayaz
#!/a.k.a/jazz
_____________________________________________________________
Ayaz Mudarris, Senior Consultant
Collective http://www.collectivetech.com
Tel (312) 781-6200 eFax (253) 541-2141
-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]On Behalf Of Bob Bakh
Sent: Friday, March 30, 2001 5:31 PM
To: 'dmonjar AT orgtek DOT com'; Veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] how important is CPU/Memory of the Master
server
CPU and memory is more a need of the Hardware. I would ask ATL what they
think is necissary to push 4 DLT8000 and Compaq what is needed to pull
through a GIG-E card. NBU will use only what is necissary to feed the
hardware. I don't know much about the Compaq lines, but you can push 4
DLT7000 with GIG-E on a Dual Xeon Processor NT box with a gig of RAM without
it even registering as a blip on the task manager.
Bob
-----Original Message-----
From: Daniel Monjar [mailto:dam AT orgtek DOT com]
Sent: Friday, March 30, 2001 12:30 PM
To: Veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] how important is CPU/Memory of the Master server
I am starting to put up 3.4 Datacenter. I will be using a Quantum/ATL
P1000 with 4 DLT8000 drives. Currently the servers are on switched
100Mb but in a couple of months I will go to switched gigabit Ethernet
on the servers. I'll be talking to the drives using two separate
Fast/Wide/Differential SCSI cards.
I'm deciding what machine to install as the master server. The OS
will be Compaq Tru64 5.1. The server can be an Alpha 4100/533 with
two processors and 2GB of RAM. Or I can use an Alpha 2100A/275 with
four processors and 640MB of RAM. It would be more convenient to me to
use the 2100 since I could pretty much dedicate it to the task. The
4100 has other production purposes.
The 4100 is much faster as far as CPU goes but I imagine this type of
things isn't CPU bound.
What do you think?
--
Daniel Monjar (mailto:dmonjar AT orgtek DOT com)
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