On 09/ 9/10 01:14 PM, Fei Xu wrote:
Hi all:
I'm a new guy who is just started ZFS for half a year. We are using
Nexenta in corporate pilot environment. these days, when I was trying to move
around 4TB data from an old pool(4*2TB raidz) to new pool (11*2TB raidz2), it
seems will never end up successfully.
1. I used CP first. the initial speed is great @ 250MB/s. but it will
suddenly become s...@400kb/s when around 400-600GB data is copied. I've tried
several times.
11*2TB raidz2 is a bad idea. The stripe is too wide, so performance will
suffer.
2. Use Rsync. Speed is crab, around 15MB/s. it will end up good but
performance seems dropped even after Rsync finished.
3. use ZFS send|recv. Speed is close to CP. but still suddenly go down to
xxxKB/s after around 1.5TB migrated.
4. I've tried CP to remote server which has 1Gb nic connection. It can be
finished but I can see a significant system slow down.
what's the root cause of that?
is it because the memory is too low? all my ZFS system has 12GB memory. I'm
considering adding at least 12GB more to each of them.
Run zpool iostat -v on the receiver when things slow down and post the
result.
I moved (send/receive) 2TB of data across a LAN last week and there
wasn't any variation in speed.
--
Ian.
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