[Gluster-users] Very slow directory listing and high CPU usage on replicated volume

[Jonathan Lefman]

Hi all,

I am having problems with painfully slow directory listings on a freshly
created replicated volume.  The configuration is as follows:   2 nodes with
3 replicated drives each.  The total volume capacity is 5.6T.  We would
like to expand the storage capacity much more, but first we need to figure
this problem out.

Soon after loading up about 100 MB of small files (about 300kb each), the
drive usage is at 1.1T.  I am not sure if this to be expected.  The main
problem is that directory listing (ls or find) takes a very long time.  The
CPU usage on the nodes is high for each of the glusterfsd processes - 3 on
each machine 54%, 43%, and 25% per core is an example of the usage.  Memory
is very low for each process.  It is incredibly difficult to diagnose this
issue.  We have wiped previous gluster installs, all directories, and mount
points as well as reformatting the disks.  Each drive is formatted with
ext4.

Has anyone had a similar result?  Any ideas on how to debug this one?

Thank you,

Jon
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