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SAN backup performance w/ LTO-1 drives
- Thread starter Barks
- Start date
Make sure that it is not the file system but the drive.
Run a test using "bigasm" - for more info please see the
"Performance Tuning Guide" which you may download from
Legato's Web server.
Bigasm will send data directly to the drive so that the
file system will be bypassed. It runs your drives at maximum speed.
Run a test using "bigasm" - for more info please see the
"Performance Tuning Guide" which you may download from
Legato's Web server.
Bigasm will send data directly to the drive so that the
file system will be bypassed. It runs your drives at maximum speed.
- Thread starter
- #3
I get 16 MB/Sec using bigasm with anywhere from 1 to 6 tape drives in seperate test. I believe this is uncompressed, correct?
When I back up Oracle datafiles I get 27 MB/Sec for 1 drive, 23 MB/Sec for 2 drives, 19 MB/Sec for 3 drives, and 16 MB/Sec for 4 drives. I see no hardware bottlenecks.
Environment :
Networker 6.1.3 and Alphastor 2.1 on SUN os box
os is HPUX 11.11
backup server is an N class box
Storage node is a superdome where Oracle DB resides
filesystems are stripped accross EMC Sym disk
Fabric switch is 2 GB
4 router cards per 10 drive HP ESL9595 library
No more than 2 drives per SCSI channel
I see no reason I should not be getting the same throughput on 4 drives as I would on 1. Any help with troubleshooting this problem would be appreciated.
Kent
When I back up Oracle datafiles I get 27 MB/Sec for 1 drive, 23 MB/Sec for 2 drives, 19 MB/Sec for 3 drives, and 16 MB/Sec for 4 drives. I see no hardware bottlenecks.
Environment :
Networker 6.1.3 and Alphastor 2.1 on SUN os box
os is HPUX 11.11
backup server is an N class box
Storage node is a superdome where Oracle DB resides
filesystems are stripped accross EMC Sym disk
Fabric switch is 2 GB
4 router cards per 10 drive HP ESL9595 library
No more than 2 drives per SCSI channel
I see no reason I should not be getting the same throughput on 4 drives as I would on 1. Any help with troubleshooting this problem would be appreciated.
Kent
So, if the native speed is 15 MB/s (you got 16) and the device is streaming, that's all you can get. If you want more, you need to buy more powerful hardware.
The bigasm tests shows you how fast your tape drives can go - it does not show you how fast your system can deliver
the data (never forget that in real life you just do not
deal with one bif file!). You might get an idea if you use
uasm. Please see the NW Performance Tuning Guide
(perftune.pdf) for more details.
The bigasm tests shows you how fast your tape drives can go - it does not show you how fast your system can deliver
the data (never forget that in real life you just do not
deal with one bif file!). You might get an idea if you use
uasm. Please see the NW Performance Tuning Guide
(perftune.pdf) for more details.
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