05-03-2017 09:04 AM
Hi,
I just want to run this past people and see if my thinkings are right....
We have the following set-up:
RHEL Master & Media server running 7.7.1
10Gb LAN connection to switch
8Gb FC to Fabric
4x LTO7 drives in a Spectra Logic T950
Now my calculations are as folows:
LTO7 write speed approx 6-700MB/s
8Gb FC throughpout approx 700MB/s
10Gb LAN throughput apprx 800MB/s
so essentially I should get quite high speeds off the drives, locally for the catalog I get approx 3-400MB/s write speed but the test client I only get 80-90MB/s, the client is on a 1Gb LAN so I am I correct in thinking that the client will only ever be able to push data at just under 100MB/s and toi get the full performance this needs to be connected at 10Gb also
I have tried tuning the buffers but it has made very little difference to the backup speed.
The clinet is a database server so rather than lots of little files it has a smaller number of larger files
I thnk my calculations are correct but please point in the right direction if I am wrong
Thanks in advance
Kev
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05-04-2017 12:34 AM
80-90 MB/sec from a client with 1Gb Ethernet is what you can expect. Going faster either requiring multiple 1G Ethernet connection in a LACP port channel or a 10GB Ethernet connection.
Hint: look into the NBU GEN_DATA file list directive for performance testing. GEN_DATA can be used for both client and media servers.
05-04-2017 12:30 AM
Hello, Kev
yes 1Gb LAN is a bottleneck in this case. So no matter how many and how fast tape drives you have on the back end here..
Regards
Michal
05-04-2017 12:34 AM
80-90 MB/sec from a client with 1Gb Ethernet is what you can expect. Going faster either requiring multiple 1G Ethernet connection in a LACP port channel or a 10GB Ethernet connection.
Hint: look into the NBU GEN_DATA file list directive for performance testing. GEN_DATA can be used for both client and media servers.
05-04-2017 01:58 AM
So my calculations were right :)
05-04-2017 01:59 AM
Thanks for the heads up Nicolai, I will check out the GEN_DATA