Hi Paul Robert Marino and Roman
thank you very much for you advise！
to Paul Robert Marino：
In fact， I use XFS as the underlying filesystem in my test cases。
NOW, According to your advise， I will increse the background self heal count
to test， I will do a feedback after my test，
in addition，Do you know change XFS which options can improve lots of small
file performance？。
thank you very much！I'm looking forward to your reply！
justgluste...@gmail.com
发件人： Paul Robert Marino
发送时间： 2014-09-08 00:15
收件人： justgluste...@gmail.com; gluster-devel
抄送： gluster-users
主题： Re: [Gluster-users] glusterfs replica volume self heal dir very slow！！why？
Its the small files there is an overhead on any operation on small lots of
small file this is not unique to Gluster. Also are you using XFS As the
underlying filesystem if you are not that would play a big part ext has issues
with performance when dealing with small file due to its over reliance on
inodes for read operations.
I would advise you to experiment with incrementing the background self heal
count a little at a time till you achieve optimal performance. Unfortunately I
can't give you hard numbers because this kind of tuning is more of an art than
a science because of the number of possible variables which come into play
depending on your hardware configuration and exact use case.
-- Sent from my HP Pre3
On Sep 5, 2014 4:16 AM, justgluste...@gmail.com <justgluste...@gmail.com>
wrote:
Hi all：
I do the following test：
I create a glusterfs replica volume (replica count is 2 ) with two server
node(server A and server B)， then mount the volume in client node，
then， I shut down the network of server A node， in client node， I copy a
dir（which has a lot of small files）， the dir size is 2.9GByte，
when copy finish， I start the network of server A node， now， glusterfs
self-heal-daemon start heal dir from server B to server A，
in the end， I find the self-heal-daemon heal the dir use 40 minutes，
It's too slow！ why？
I find out related options with self-heal， as follow：
cluster.self-heal-window-size
cluster.self-heal-readdir-size
cluster.background-self-heal-count
I want to ask， modify the above options can improve the performance of
heal dir？ if possible， please give a reasonable value about above options。
thanks！
justgluste...@gmail.com
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