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Quantum LTO4 - very low performance

Our new Quantum LTO4 drive is running very slow, even slower, that the DLT drive we had before.
The drive is connected via LSI 3801X SAS controller.
We're running RAID 5 with 3 SATA 7200 drives connected via the  onboard SATA controller of the INTEL S50000V board.
I already tried Backup Exec, ArcServe and NTBackup. I tried Backup Exec drivers and the original Quantum drivers
All tools are bringing a performance of like 100Mb/min.
I run HDTach and it clocked our raid with 160Mb/sec.
Anyone an idea?

Thanks in advance...
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bubu12345
Asked:
bubu12345
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1 Solution
 
DextertronicCommented:
Try updating the drivers and firmware all devices involved in data transfer, scsi cards, tape drives, server BIOS, chipsets
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Randy_BojanglesCommented:
Hmmmm

Performance on the LTO4 should be more like 160MB/s (depending on drive, compression etc)

I'd look first at the cable if you've changed all the drivers etc
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DextertronicCommented:
A Quantum LTO44 drive has a native rate of 120 MB/s and that would be at the best ultimum conditions that Quantam could provide.
I don't think you could replicate or get close to that under normal conditions.
My IBM LTO4 connected to a Adaptec SCSI 39320A Ultra 320 card does 40MB/s when backing up Exchange data.

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bubu12345Author Commented:
for now the drive does 100Mb / per MINUTE!!!
That's extremly slow...

I already changed the SAS controller and the cable...

Quantum doesn't want to replace the drive cause XTalk shows the performance of 120MB/s, so they say the drive should be ok.
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DextertronicCommented:
I take it XTalk measures the speed of the tape drive writing to a blank tape?
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bubu12345Author Commented:
Yes, but it only generates data in the RAM, it doesn't read anything from hard drives
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DextertronicCommented:
You could try using NTBackup and comparing the data rate to BE.

That might isolate BE as the problem.
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bubu12345Author Commented:
Already done, NTB brings the same performance
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DextertronicCommented:
have you got another box you can test the controller card and tape drive on?


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bubu12345Author Commented:
I already tried two different controllers. But i only have one server here.
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richnCommented:
Have you checked out settings in your backup software such as "block size", "buffer size", "buffer count" and "high water mark"?
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bubu12345Author Commented:
Ok, no solution here, plz close it...
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richnCommented:
Did you look at the settings I gave you?  If you tell me what they are set to I might be able to offer suggestions to improve performance.
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streamrydaCommented:
Just FYI, I get ~5500mb/min writing to LTO4 from a single off-shelf SATA 1.5TB drive. I am using 2003 Server, Backup Exec 12.5, a Quantum LTO4 HH SAS drive and an LSI SAS HBA. The performance is definitely possible.

A similar issue has happened to me and it turned out my data was heavily fragmented. Tools such as HDtach are low-level drive/raid benchmarks, they do not measure the speed of reading from the file system.

I would try defragging the drives. Further, you could copy one of the drives' contents to a fresh drive, which essentially will be defragged since it will be written sequentially. Then write to tape from the fresh drive and see if there's a performance increase.
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