Hi all，
A cache tier, 2 hot node with 8 ssd osd, and 2 cold node with 24 sata osd.
The public network rate is 10000Mb/s and cluster network rate is 1000Mb/s.
Using fuse-client to access the files.
The issue is:
When the files are in hot pool, the copy rate is very fash.
But when the files are only in cold pool, the rate only reach 20MB/s.
I known that when files are not in the hot pool, the files should been copy
from cold pool to hot pool first, and then from hot pool to client.
But the cpu, ram and network seems not the bottleneck. and will be the cause
of system design?
Are there some params to adjust to improve the rate from cold pool to hot
pool?
Thanks
2015-06-16
liukai
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