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Slow backup

Posted on 2004-09-21
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Last Modified: 2013-12-16
Doing a backup of 22GB to a SDX-400V AIT driver takes almost 7 hours.
What could be wrong?
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Question by:jclobocar
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by:jlevie
ID: 12114891
Are you using a Single Ended SCSI controller or an LVD SCSI controller? And what make/model is it?

Is the SCSI bus properly terminated?

How are you doing the backup (dump, tar, cpio, other) and what is the backup command you are using?

What is the load average and swap statistics look like when the backup is occuring?
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by:jclobocar
ID: 12115491
Are you using a Single Ended SCSI controller or an LVD SCSI controller? And what make/model is it?
- Adaptec 29320AR

Is the SCSI bus properly terminated?
- How do I check this? It is my first installation using SCSI devices.

How are you doing the backup (dump, tar, cpio, other) and what is the backup command you are using?
- flexbackup, type = tar

What is the load average and swap statistics look like when the backup is occuring?
- How do I check this? Backup is scheduled to start at 00h00 when there are no users working.
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jlevie earned 150 total points
ID: 12118568
> - Adaptec 29320AR
Okay so you do have a LVD capable controller.

> Is the SCSI bus properly terminated?
> - How do I check this? It is my first installation using SCSI devices.
If you used the 5 position cable furnished with the card it does have a terminator on one end. The Tape drive should be attached to a connector between the end with the terminator and the SCSI card.

> - How do I check this? Backup is scheduled to start at 00h00 when there are no users working.
You can always kick off a backup at the end of the day manually so that you can watch the system (via top, uptime, etc) to see what's happening.

Since you claim to be using tar as the archive method it might be a good idea to write a directory containing a gigabyte or so to tape with tar and time the operation. It could be that the default block size of tar (10k) simply isn't a good match to this drive and setting it to a higer value will speed things up (see "4.1. I get I/O errors or other errors from my tape drive." in http://flexbackup.sourceforge.net/faq.html#Configuration3
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