Re: [Networker] Poor performance with LTO 2 drives

thanks

what we found was a file in /debug called noimmediate that networker touched
and then turned off a feature in both turbopak and power edition.  This
feature bypasses the internal loopback that networker uses.  When enabled,
memory is used, greatly speading up the backup process. We are now getting
over 30MB/s on each LTO2 drive, and our old Exabyte drives realized an
increase of almost 5MB/s.

-----Original Message-----
From: Tarjei T. Jensen [mailto:tarjei.jensen AT KVAERNER DOT COM]
Sent: Wednesday, November 26, 2003 12:19 AM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] Poor performance with LTO 2 drives


Paul Langford wrote:
>We are currently testing a new jukebox, and are not getting anywhere near
>the performance we expected.
>
>Our current setup is:  HP-UX 10, Networker 6.1.2, Exabyte X80 jukebox with
>6 Exabyte Mammoth 2 drives. Disks are mounted locally. I get about 13M/s on
>the drives.

HP-UX 10 means that the machine is quite old. It is not surprising that the
machine has problems performing as expected. I suspect that the performance
measurement tools does not do any processing on the data that is written to
the tape drive.

I would not be surprised if the machine runs out of CPU resource (despite
sar, etc saying otherwise).


greetings,

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