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тАО03-30-2009 04:41 PM
тАО03-30-2009 04:41 PM
MSL2024 LTO4 Ultr Tape Library Performance, normal or slow?
I am a newbie with tape backups. I am the network admin here in our school. I got this tape library to replace our 960 tape drive hoping that it will increase performance. I have a dedicated server which is a Proliant DL360 G5 using U320 SCSI card. We have a gigabit network with 4 Mac servers and 4 Windows servers. I wonder if we are running normal or our performance is slow. We are backing up system state of AD and OD and the rest are data. We have a approx. 1.6TB of data to backup. I run a test and I it took almost 52 hours to finish the backup. Is this normal? is it really slow? Is it possible that we can shrink the backup time in less than 24 hours?
Thanks,
Marlon
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тАО04-01-2009 03:03 AM
тАО04-01-2009 03:03 AM
Re: MSL2024 LTO4 Ultr Tape Library Performance, normal or slow?
The tape drive is fast enough, but it needs constant a data rate to be sent to the drive. A single host cannot send it's data fast enough for the tape drave to run at full speed.
You need software with an agent on all backup-clients to send data in parallel (8 data streams) to the backup server.
NB! not one server at a time, but all servers in parallel
NBB! this paralel backup uses to the same tape(s) for all streams.
This may not match other wishes for backup
(like a single tape per host).
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тАО04-01-2009 04:10 AM
тАО04-01-2009 04:10 AM
Re: MSL2024 LTO4 Ultr Tape Library Performance, normal or slow?
So the limit was not the Ultrium drive. Are you copying data from the servers, reading from their hard disk, over the network? That can be very slow, specially if you're copying thousands of small files.
Run a performance test with Library and Tape tools. It will use data generated on RAM, so the HDD is not a limit.
Also you can do a test and copy from one server to your backup server hard disk. If the copy does not go at 80 MB/s at least, the tape drive is not the limit.
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тАО04-01-2009 05:27 AM
тАО04-01-2009 05:27 AM
Re: MSL2024 LTO4 Ultr Tape Library Performance, normal or slow?
Tape Library: MSL2024 LTO4 Ultr
Dedicated server for backup: Proliant DL380
- Symantec Backup Exec 12.5
4 Mac Servers: Xserver Mac OS X Leopard
- SBE Agent for Mac
-200GB in size total
4 Windows Servers: Windows 2003
-SBE Agent for Windows
-1.4TB in size total
Current Performance: 1.6TB in 52 hours
Do you guys have any idea on how can I setup the tape backup system to gain its optimized performance?
Thanks,
All are connected to a gigabit network
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тАО04-01-2009 06:16 AM
тАО04-01-2009 06:16 AM
Re: MSL2024 LTO4 Ultr Tape Library Performance, normal or slow?
Even this number won't be reality.
apart from that your OS needs to retrieve files from the disks before it can be sent to the network.
If you're lucky you will get 20MByte/sec.
calculate this to 1.6TByte it counts up to more than 20 hours!
The tape-drive motor will start turning, write some buffered data, then stops because data comes too slow. when the buffer is filled it wil rewind a bit before starting to write again.
To have the tape-drive running at full speed you need multiple servers sending their 20MByte/sec , this is done by backup-agents.
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тАО04-01-2009 06:17 AM
тАО04-01-2009 06:17 AM
Re: MSL2024 LTO4 Ultr Tape Library Performance, normal or slow?
If you're copying files from another server, across a network, then the limit is not the tape drive, the data must be read from the server disk and transferred to the backup server before being writted to tape.
If the backup app is reading the files directly, then the number of files and the fragmentation level can have a big impact on the speed of the copy.
Library and Tape Tools can do performance tests on the drive and the filesystem independently. You can perform some tests, like copying to local hard disk instead of copying to tape, or copying a single big file instead of thousands of files on several folders.