Drive #1 as 1 filesystem mounted on /, drive #2 has 1 filesystem, mounted on /data1
(both have softupdates enabled)
i) start a process doing some io on drive #1 ii) start iostat 5
iostat blocks until the process is completed. If I start iostat *first*, then it does not block, and
I can see the io activity generated by the process when it starts.
If I try this test on drive #2, then neither case blocks.
I am running the SMP kernel, but can reproduce this using GENERIC.
Any ideas ?
P.s : This came to my attention whilst experimenting with the smp kernel, I was able to get nice 2 processer scaling with 2 running processes *except* if they both needed to do IO (even if they were doing it on different drives).
Note : Have previously run 5.1 on a HP VE6, and dont recall encountering this issue.
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