Amanda-Users

Re: Debugging lufs vtape and amanda flushing-throtle for amanda

2005-05-25 09:40:00
Subject: Re: Debugging lufs vtape and amanda flushing-throtle for amanda
From: Vlad Popa <vlad.popa AT sbg.ac DOT at>
To: amanda-users AT amanda DOT org
Date: Wed, 25 May 2005 15:23:34 +0200

Hi Jon ,

Jon LaBadie schrieb:

On Tue, May 24, 2005 at 11:53:57PM +0200, Vlad Popa wrote:
Hello Jon !

Jon LaBadie schrieb:

On Mon, May 23, 2005 at 12:05:21PM +0200, Vlad Popa wrote:
I'll ask Paul's question slightly differently.
How can you WANT to run any slower (see below).

DUMP SUMMARY:
                                 DUMPER STATS            TAPER STATS
HOSTNAME     DISK        L ORIG-kB OUT-kB COMP% MMM:SS  KB/s MMM:SS  KB/s
-------------------------- --------------------------------- ------------
h50234       /etc        0    2440   2440   --    0:03 930.1   9:26   4.3
This was your biggest, and speediest successful taping.
It only ran at 4300 bytes/sec
...
Something is seriously wrong with your network connection to your vtape.
I strongly urge you to fix your network connection rather than continue
to try to get amanda (or any application) to work with a broken network.


You are absolutely right Jon, but I cannot tweak more the lufs.

I was thinking more of the hardware end of the setup.  There have been
frequent mentions of poor network performance when a switch and host
are not configured correctly.  Sometimes depending on the auto-config
feature of the switch or host does not give the best connection.

I have tested native ftp transfers to this host (beside lufs) which were at about 4.3 mb per sec ("ftp hostname" and then "put file ..") for several files differring significantly in their size. The rate did not fall below 4 megs per sec.

Just an interesting observation, amanda sees 4.3 kb/sec, you got 4.3 mb/sec
for ftp transfers.

No other way to access that remote disk than still beta lufs and ftp?

Nope, no other way than ftp access. Using lufs or not using it is up to me. I will never see this server . We have rented a root server which is probably located in Berlin or elsewhere. The rent is including access to a ftp share on their server for backups) . We have only some kind of console and ssh access. All I could do is tweak the server's software. No playing with switches or network cards possible. I have compiled the kernel (from 2.4.x to now 2.6.8) for the lufs option and upgraded from debian woody to sarge. I took the lufs source package included in sarge and compiled it to my kernel-sources.

Greetings

Vlad

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