Jon Nelson wrote:
1. metadata version matters. Why?
2. VERY LITTLE I/O takes place (between 0 and 100KB/s, typically no
I/O at all) according to vmstat. Why? If it takes 1m34s to "grow" the
array, but no I/O is taking place, then what is actually taking so
long?
3. I removed the bitmap for these tests. Having a bitmap meant that
the overall speed was REALLY HORRIBLE.
The results:
metadata: time taken
0.9: 27s
1.0: 27s
1.1: 37s
1.2: 1m34s
Questions (repeated):
1. Why does the metadata version matter so much?
I have no idea.
2. If no I/O is taking place, why does it take so long? [ NOTE: I/O
must be taking place but why doesn't vmstat show it? ]
vmstat doesn't tell you enough, you need a tool to show per-device and
per-partition io, which will give you what you need. I can't put a
finger on the one I wrote, but there are others.
--
Bill Davidsen <davidsen@xxxxxxx>
"Woe unto the statesman who makes war without a reason that will still
be valid when the war is over..." Otto von Bismark
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