>Currently my average dump rate on a 100mbit full switched network
>consisting of Cisco 2948G's and Dell Pentium III 800 mhz with 512 megs of
>ram server is at:
>
>Avg Dump Rate (k/s) 364.5 364.5 --
>
>How can I speed this up?
That depends on where the problem is. It may have absolutely nothing
to do with Amanda.
What happens if you do an ftp push (put) from the client to /dev/null
in binary mode of several (10s) of MBytes to the server? Every time
I see 100 Mbit Ethernet and slow performance in the same breath, I get
suspicious of a duplex problem someplace.
>In amanda.conf I have set netusage to 50000 kbits.
>should I increase that number ...
That number only controls the starting of dumps. It's not used once
they get going.
>decrease the number of dumps running concurrently
Can't answer that since you don't say how many are running. But they
could be banging on the client disk so much it would have an effect.
You might also mention whether you're using GNU tar or dump, and what
version of each.
>... Does high compression play a factor in the file transfer
Definitely. Are you compressing on the client or server? If on the
client, it could be adding vast amounts of CPU time to the transfer time
and thus lowering the throughput. Ditto on the server. You really want
to think about whether "best" is worth it.
>or does the compression be done on the client
>machine then sent over the network to the dump disk?
I don't know. You didn't tell us what you're using. If you are using
"client fast" (or "client best") then it's done on the client and a
(presumably) smaller image is transferred across the network.
>My local disk is an IBM Ultra 2 9 gig 10000 RPM drive. I believe 50000
>kbps is sort of slow for a drive like this, but I don't get any
>improvements by bumping this number up?
That's value is size (amount of space to use), not speed. Amanda does not
care how fast the holding disk is, but it definitely cares how big it is.
>What can I do to increase my dump rate? ...
First, find the source of the problem. Then work on that.
>Also does amanda ignore, when
>defining a tape type the speed of what the tape drive is capable? ...
Yes. It completely ignores the tape speed value. Ditto for network
speed. It goes as fast as it can and lets the OS and hardware control
that.
>Im assuming that compression may play a role in the speed of the tape
>drive copying content?
Only if you're also trying to use hardware compression. Never turn on
both hardware and software compression.
>Tanniel Simonian
John R. Jackson, Technical Software Specialist, [EMAIL PROTECTED]
