Whats the cause of this problem

Hi everyone!
Whats the cause of this sort of errors/warnings in alert log.
kcrrsarc: (WARN) Failed to find ARCH for message (message:0x1)
tkcrrpa: (WARN) Failed initial attempt to send ARCH message (message:0x1)
Maximum redo generation record size = 80896 bytes
Maximum redo generation change vector size = 77472 bytes
tkcrrsarc: (WARN) Failed to find ARCH for message (message:0x10)
tkcrrpa: (WARN) Failed initial attempt to send ARCH message (message:0x10)
*** 2011-04-16 01:24:12.184
Warning: log write time 990ms, size 3KBThanks.

The value was 10 and I just increased it to 12That seems to be an extremely high value. I would guess that your I/O system f or the redo log and archivelogs cannot keep up with the rate of redo generation.
You may have addressed a symptom, not a cause.
Is the cause :
a. Very (unnecessarily) high redo rates ?
b. Slow I/O (with a warning about log write time being logged) ?
Hemant K Chitale

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