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machine load

Marcel Schepers
Occasional Contributor

machine load

Hello,

When I start a backup using star and monitor the machine load using top I see something I do not understand. The load average is 1.00 while the CPU claims 97.6% idle time. I have attached a screenshot. Isn't that strange, a load of 1.00 combined with that much idle time?

For the record, I am using a HP C35480A on a linux machine (Debian, 2.4.21) using an Adaptec AVA-2904 SCSI card.

Thank you for reading,
Marcel
5 REPLIES
Steven E. Protter
Exalted Contributor

Re: machine load

Backups are not CPU intensive, they are I/O intensive.

That situation is perfectly normal.

SEP
Steven E Protter
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Caesar_3
Esteemed Contributor

Re: machine load

Hello!

Intresting which tools you use to backup and
also which backup device you use that connected via the SCSI.

Probably it could take more cpu for doing the
backup process.

Caesar
Caesar_3
Esteemed Contributor

Re: machine load

Hello again!

Sorry for didn't saw star you mean tar or
it's star some tar version, if so then
as in my first answer what hardware you use.

Caesar
Marcel Schepers
Occasional Contributor

Re: machine load

I am using a HP C35480A tape drive, it is an old DDS-1 unit. It is connected to a Adaptec-2904 SCSI card. The Linux SCSI driver (AIC7xxx) is part of the kernel, as opposed to a kernel module.
Caesar_3
Esteemed Contributor

Re: machine load

Hello!

Did you ever check how much time takes to
backup 1GB?

The DDS1 is old ans slow so it's could be
that for work in the speed I/O of the tape
linux didn't need to work hard.

But made the check for the speed.

Caesar