[Gluster-users] Writing is slow when there are 10 million files.

[Terada Michitaka]

Dear All,

I have a problem with slow writing when there are 10 million files.
(Top level directories are 2,500.)

I configured GlusterFS distributed cluster(3 nodes).
Each node's spec is below.

 CPU: Xeon E5-2620 (2.00GHz 6 Core)
 HDD: SATA 7200rpm 4TB*12 (RAID 6)
 NW: 10GBEth
 GlusterFS : glusterfs 3.4.2 built on Jan  3 2014 12:38:06

This cluster(volume) is mounted on CentOS via FUSE client.
This volume is storage of our application and I want to store 3 hundred
million to 5 billion files.

I performed a writing test, writing 32KByte file × 10 million to this
volume, and encountered a problem.

(1) Writing is so slow and slow down as number of files increases.
  In non clustering situation(one node), this node's writing speed is 40
MByte/sec at random,
  But writing speed is 3.6MByte/sec on that cluster.
(2) ls command is very slow.
  About 20 second. Directory creation takes about 10 seconds at lowest.

Question:

 1)5 Billion files are possible to store in GlusterFS?
  Has someone succeeded to store billion  files to GlusterFS?

 2) Could you give me a link for a tuning guide or some information of
tuning?

Thanks.

-- Michitaka Terada
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://supercolony.gluster.org/pipermail/gluster-users/attachments/20140415/151d88bb/attachment.html>