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

[Pranith Kumar Karampuri]

Jonathan,
   Could you give us the directory structure details, so that we can try to re-create the issue. I am assuming each file is about 300kb. Please give us the depth of the directory structure and how many directories in each level.

Thanks
Pranith
----- Original Message -----
From: "Jonathan Lefman" <jonathan.lefman at essess.com>
To: gluster-users at gluster.org
Sent: Friday, November 2, 2012 5:33:21 AM
Subject: [Gluster-users] Very slow directory listing and high CPU usage on	replicated volume


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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