Hi,
after setting up an four node cluster we have one node that is way
slower than the other 3 nodes.
We using eg. tiotest for benchmarking the GFS.
Normal Node:
Tiotest results for 4 concurrent io threads:
,----------------------------------------------------------------------.
| Item | Time | Rate | Usr CPU | Sys CPU |
+-----------------------+----------+--------------+----------+---------+
| Write 40 MBs | 0.2 s | 227.426 MB/s | 36.4 % | 384.4 % |
| Random Write 16 MBs | 0.1 s | 143.405 MB/s | 58.7 % | 146.9 % |
| Read 40 MBs | 0.0 s | 2558.199 MB/s | 307.0 % | 1228.0 % |
| Random Read 16 MBs | 0.0 s | 2685.169 MB/s | 550.0 % | 1374.9 % |
`----------------------------------------------------------------------'
Slow Node:
Tiotest results for 4 concurrent io threads:
,----------------------------------------------------------------------.
| Item | Time | Rate | Usr CPU | Sys CPU |
+-----------------------+----------+--------------+----------+---------+
| Write 40 MBs | 1.4 s | 27.687 MB/s | 2.2 % | 121.8 % |
| Random Write 16 MBs | 4.2 s | 3.695 MB/s | 0.0 % | 7.9 % |
| Read 40 MBs | 0.0 s | 2228.288 MB/s | 89.1 % | 1337.1 % |
| Random Read 16 MBs | 0.0 s | 2252.739 MB/s | 230.7 % | 692.1 % |
`----------------------------------------------------------------------'
any hints why this could happen ??
Using kernel 2.6.15.2 (sorry no RH)
besides that the cluster runs very stable !
best regards
--
----
Frank Schliefer
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