On Nov 5, 2011, at 10:35 PM, John Clizbe wrote:
> Robert Hinson wrote:
>> How long does it take to make a dump?
>
> Depends on how fast you can write to disk. Takes about 90-100 minutes on my
> ATA/100 mirror. haven't timed it in quite a while.
>
hint: If you're purely limited by write I/O speed, try mmap(2)
and do this on the output buffer:
xx = madvise(mapped, nmapped, MADV_DONTNEED);
Use one single buffer per-dump file, fill sequentially.
OTOH, I suspect you will find some other bottlenecks to dumping than I/O.
hth
73 de Jeff
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