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418
March 21st, 2012 06:00
How much many write can a NC 960 process
There is an EMC NC 960 SAN to which a Unix server is attached. The SAN performance seems to be poor to be but the SAN administrator says that it is running as it should. Below is an output of iostat from the Unix server please let me know what you think.
The system is showing 4.61% waiting for disk i/o when 9,909 blocks are written.
Linux 2.6.18-164.el5PAE (d9v21pimdb1) 03/21/2012
avg-cpu: %user %nice %system %iowait %steal %idle
1.26 0.00 1.96 4.61 0.00 92.17
| Device | tps | Blk_read/s | Blk_wrtn/s | Blk_read | Blk_wrtn |
| sda | 1.98 | 0.00 | 0.00 | 0 | 0 |
| sda1 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sda2 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sda3 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sda4 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sda5 | 1.98 | 0.00 | 0.00 | 0 | 0 |
| sdb | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sdb1 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sdb2 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sdc | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sdc1 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sdd | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sdd1 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sdd2 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sde | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sde1 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sdf | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sdf1 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sdf2 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sdg | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sdg1 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sdh | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sdh1 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sdh2 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sdi | 0.00 | 0.00 | 0.00 | 0 | 0 |
| sdi1 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| dm-0 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| dm-1 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| dm-2 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| dm-3 | 8.91 | 0.00 | 71.29 | 0 | 72 |
| dm-4 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| dm-5 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| dm-6 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| dm-7 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| dm-8 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| dm-9 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| dm-10 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| emcpowera | 248.51 | 0.00 | 2035.64 | 0 | 2056 |
| emcpowera1 | 0.00 | 0.00 | 0.00 | 0 | 0 |
| emcpowera2 | 248.51 | 0.00 | 2035.64 | 0 | 2056 |
| emcpowerb | 720.79 | 0.00 | 7786.14 | 0 | 7864 |
| emcpowerb1 |
720.79 |
0.00 |
7786.14 | 0 |
7864 |
| dm-11 | 1238.61 | 0.00 | 9908.91 | 0 | 10008 |
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afp92Tq1w012558
86 Posts
0
March 21st, 2012 08:00
Hi ,
Can you please let me know if you are facing performace issue on the celerra ?
Thanks
Vanitha
Paul_v1
2 Posts
0
March 22nd, 2012 06:00
Yes,
There is a Cloverleaft interface engine connected to the SAN and it is not able to process messages as fast as it should.
When I looked at the performance of the server I noticed the large waiting for disk I/O. For other servers on SANs by other vendors this amount of data is not a problem, but it seems to be on this EMC SAN.
I have seen this type of problem happen on others SANs and it was due to degraded performance because of cache batteries that had expired.
My SAN resource has said this can't be the case for the NC960 as it does not have cache batteries. The battery is for the entire SAN.