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тАО03-17-2003 07:15 AM
тАО03-17-2003 07:15 AM
MSL 5000 Too Slowwww
Terminated as the manual
The Scsi card resides in a Brand new HP/Compaq DL380 with 1 GB of Ram and a 2.8ghz proc.
We have carried out the following tests.
Backup of a local system volume on to each drive separately 600mb/m, when we try and schedule a job to both tapes at the same time the throughput drops below 250mb/m per job.
When we backup other servers across the LAN we get upto 600mb/m on and individual drive, but again when we backup using both drives we only get around 250mb/m each...
This is the system we are currently testing, we have actually got two of these units (MSL)and two servers (DL380) to ultimately backup 2.6TB of data.
Is there any way of combining them / configuring them to backup at a faster rate?
We are happy to schedule four jobs to run conquently, but we need the through-put...
Regards
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тАО03-17-2003 07:22 AM
тАО03-17-2003 07:22 AM
Re: MSL 5000 Too Slowwww
Most probably, you daisy-chained your SDLT drives to 1 SCSI controller.
That is a big no-no.
In order to get the maximum out of your SDLT drives, you have to put them on seperate SCSI buses.
600Mb/min = 10Mb/s. Your SDLT 160/320 is capable of 16Mb/s native speed, so even that is a bit slow.
When you start two backups at the same time, though, you would hog the bus, that is why the throughtput suffers dramatically.
Please try to connect the drives to seperate SCSI buses.
HTH,
Vince
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тАО03-18-2003 12:03 AM
тАО03-18-2003 12:03 AM
Re: MSL 5000 Too Slowwww
Further, if you do not satisfy the speed needs of your tape drive it will go into shoe shine mode. This will 1. slow down backup performance 2. kill your drive and 3. wear your catrtridges.
I suggest you download and use PAT (Performance Assessment Tool) It will show you where your bottlenecks are!
http://search.hp.com/gwuseng/redirect.html?url=http%3A//h20015.www2.hp.com/en/softwareDownloadIndex.jhtml%3Flc%3Den%26softitem%3Dco557en%26sw_lang%3Den&qt=performance+assessment+tool&hit=1
Cheers
Peter
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тАО03-18-2003 12:07 AM
тАО03-18-2003 12:07 AM
Re: MSL 5000 Too Slowwww
Peter
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тАО03-18-2003 12:16 AM
тАО03-18-2003 12:16 AM
Re: MSL 5000 Too Slowwww
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тАО03-18-2003 03:53 AM
тАО03-18-2003 03:53 AM
Re: MSL 5000 Too Slowwww
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тАО03-18-2003 05:56 AM
тАО03-18-2003 05:56 AM
Re: MSL 5000 Too Slowwww
But true, 1x 100bt will give you max. 10MB/sec.
As you can read Jonathan also sees the drop in performance with local data! So the SCSI path looks like the problem. Neverteless it is supportde to dasychain 2 SDLT to one SCSI.
I would also check your SCSI cables, terminator and the total cable length.
Peter
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тАО03-18-2003 06:55 AM
тАО03-18-2003 06:55 AM
Re: MSL 5000 Too Slowwww
Indeed, Peter.
However, if it is supported, it does NOT mean that it works fine for both tape drives at the same time. You can have 15 SDLT tape drives in 1 SCSI bus in theory. But would it work? If you backup 1 at a time, then yes. If more than 1 are performnig backups or restoring, then no, that would be too much for the bus.
HTH,
Vince
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тАО03-19-2003 02:29 AM
тАО03-19-2003 02:29 AM
Re: MSL 5000 Too Slowwww
I would agree that you have a local bandwith issue and a network bandwidth issue. Any network backup/restore will be limited to a max of 10MB/s as other posters have said. This will not keep one SLDT drive well fed, let alone two.
Also, I would recommend one drive per scsi controller if you can. A dual controller would be ok here as the bottleneck will not be the PCI bus but rather the SCSI bus.
Although the scsi interface on the drive is capable of 80MB/s synchronous, there will still be a significant overhead of non data phase SCSI commands, which will use up available bus bandwidth.
Also, operating at low transfer rate modes that will cause the drive to streamfail and reposition will not kill your drive as other posters have mentioned. It is not desirable from a performance standpoint and will create more media wear and is conesqeuently not good practice from a reliability standpoint, but your drive will not die because of it :-)
Cheers,
Dave Dewar.
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тАО03-19-2003 02:37 AM
тАО03-19-2003 02:37 AM
Re: MSL 5000 Too Slowwww
Peter