Slow Backup with Retrospect WG 5.1 on OS9 and OS X Client

[chadh]

I'm using Retrospect WG 5.1 running on Mac OS 9.1 with the following config:

Powermac 8500 w/ NewerTech G4/400 upgrade

544mb RAM

9.1 GB SCSI HDD on internal Fast SCSI bus

ATTO PSC SCSI card

External DLT 7000 connected to the ATTO Card

100Base-T ethernet

 

I have 2 clients:

1) Windows 2000 sp3 system

256MB RAM

Pentium III

100Base-T ethernet

 

2)Powermac G5

1024MB RAM

Mac OS x 10.3.5

1000Base-T ethernet

 

All devices are connected to a Gigabit switch. The computers are all using auto negotiation with the 8500 and Win2k running at 100/full and the G5 running at 1000/full.

 

The problem is that backups from the G5 run much slower than the other systems. When the 8500 backs-up itself, Retrospect reports ~140MB/min write and compare speeds of ~250MB/min. Simmilar results are seen with the Win2k computer. The G5 however gets ~35mb/sec write and compare speed of ~40MB/min.

 

I've tried setting the G5 to 100/full like the other systems with no change.

 

Any ideas would be appreciated.

 

Chad

[natew]

Hi

 

OSX has tons of small files that really slow down the backup. I would run a benchmark test with a group of large files (50MB+) and see if you get better results. That will help narrow things down.

 

Thanks

Nate

[chadh]

Thanks for responding.

 

I took a set of very large video file ~800mb each. A total data set of about 4gb. The rate for writing to tape was ~40mb/min.

 

I tied copying the same set of data from the G5 to the 8500 using AppleShare and got about the same data transfer.

 

 

Chad