I am not sure whether you are getting any performance issue or not - but Network based backups are much slower as expected. You may consider using Avamar NDMP Accelerator for the CIFS based NAS backup which will definitely increase the backup performance by few times.
You may get in touch with your local EMC contacts to discuss this further - also, please feel free to open a service request, if you feel that there may be some performance issue with the NS-120. Before that, please ensure that the networking configuration is done properly on the NAS and Switch end - the ports speed/duplex settings matches end to end etc.
Have you tried to check read and write performance by just copying file to/from Celerra by using any windows client? If you are observing good write performance (copying from client machine to Celerra) but poor read performance (copying from Celerra to client machine), it is most likely related to datamover's network parameters configuration issue. We were facing the same issue and have resolved it by changing some parameter values.
On the basis of your reply, I will be able to suggest you further.
what you describe are the classical symptoms of a network config mismatch or switch snafu
- check how the Celerra interfaces are set in terms of Speed and Duplex (server_sysconfig server_2 -pci )
- check the same on the switch side
- either set both to auto or both to the same values
- turn on flow control on both sides
- check that the EtherChannel/LACP settings are the same
- get the interfaces stats for both Celerra (server_netstat server_2 -i ) and switch ports and look for I/O errors and overflows
there is also the possibility of using fastRTO on the Celerra - while that might help it usually just masks the underlying config problems.
Rainer
P.S.: from experience - if your network is run by a seperate department - dont believe them if they say they that all is find on their side - ask them to send you the command output for the port config and port statistics and check for yourself
nandas
4 Operator
•
1.5K Posts
0
July 7th, 2009 09:00
I am not sure whether you are getting any performance issue or not - but Network based backups are much slower as expected. You may consider using Avamar NDMP Accelerator for the CIFS based NAS backup which will definitely increase the backup performance by few times.
You may get in touch with your local EMC contacts to discuss this further - also, please feel free to open a service request, if you feel that there may be some performance issue with the NS-120. Before that, please ensure that the networking configuration is done properly on the NAS and Switch end - the ports speed/duplex settings matches end to end etc.
Thanks,
Sandip
teovmy
2 Intern
•
211 Posts
0
July 10th, 2009 12:00
mssqadri
8 Posts
0
June 4th, 2010 00:00
Have you tried to check read and write performance by just copying file to/from Celerra by using any windows client? If you are observing good write performance (copying from client machine to Celerra) but poor read performance (copying from Celerra to client machine), it is most likely related to datamover's network parameters configuration issue. We were facing the same issue and have resolved it by changing some parameter values.
On the basis of your reply, I will be able to suggest you further.
Regards,
Saleem
GCBurns
1 Message
0
June 10th, 2010 02:00
Saleem -
I am having the same problem, slow reads fast writes on an NS-120.
You mentioned some changes to the datamoves's network parameters - could you share those to see if it will aleviate some of our problems.
Cheers
Gary
Rainer_EMC
4 Operator
•
8.6K Posts
0
June 10th, 2010 08:00
Hi Gary,
welcome to the forum.
what you describe are the classical symptoms of a network config mismatch or switch snafu
- check how the Celerra interfaces are set in terms of Speed and Duplex (server_sysconfig server_2 -pci )
- check the same on the switch side
- either set both to auto or both to the same values
- turn on flow control on both sides
- check that the EtherChannel/LACP settings are the same
- get the interfaces stats for both Celerra (server_netstat server_2 -i ) and switch ports and look for I/O errors and overflows
there is also the possibility of using fastRTO on the Celerra - while that might help it usually just masks the underlying config problems.
Rainer
P.S.: from experience - if your network is run by a seperate department - dont believe them if they say they that all is find on their side - ask them to send you the command output for the port config and port statistics and check for yourself