[Gluster-users] two nodes with different performance metrics

[John Madden]

Two-node AFR with two clients, all four machines identical, v2.0.9, etc.
   I notice that one client is able to read and write much more quickly
than the other and I'm wondering how I go about finding why that is.  In
a two-node AFR, is one node always elected to be the primary node for
writes and does that apply for reads too?  That would explain my
situation (client0 and server0 share a hypervisor, client1 and server1
share a different hypervisor).  If this behavior exists, can it be
configured?

bonnie++ output from the slower client:

Version  1.03       ------Sequential Output------ --Sequential Input-
--Random-
                      -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP
/sec %CP
pxhorde1       300M 23635  24 41146   3  1889   0 19153  18 30057   1
567.9   1
                      ------Sequential Create------ --------Random
Create--------
                      -Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
                files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
/sec %CP
                   16   293   0  1807   0   346   0   270   0  1965   0
   459   0
pxhorde1,300M,23635,24,41146,3,1889,0,19153,18,30057,1,567.9,1,16,293,0,1807,0,346,0,270,0,1965,0,459,0


and from the faster client:

Version  1.03       ------Sequential Output------ --Sequential Input-
--Random-
                      -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP
/sec %CP
pxhorde0       300M 27770  31 63545   6  4150   0 31808  29 66540   4
582.4   0
                      ------Sequential Create------ --------Random
Create--------
                      -Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
                files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
/sec %CP
                   16   303   0  1714   0   253   0   295   0  1780   0
   415   0
pxhorde0,300M,27770,31,63545,6,4150,0,31808,29,66540,4,582.4,0,16,303,0,1714,0,253,0,295,0,1780,0,415,0




-- 
John Madden
Sr UNIX Systems Engineer
Ivy Tech Community College of Indiana
jmadden at ivytech.edu