[Samba] Samba slowness serving SAN-based GFS2 filesystems
brett.klingensmith at ansys.com
Tue Dec 14 15:55:51 MST 2010
I'm experiencing slowness serving SAN-based GFS2 filesystems (of a specific
Here's my layout:
I have a server cluster.
OS= RHEL 5.4 (both nodes...)
*On this cluster are 6 GFS2 Clustered filesystems.
*4 of these volumes belong to one huge LUN (1.8 TB), spanning 8 disks. The
other 2 remaining volumes are 1 to 1 with their own LUN's, respectively.
*The 2 volumes which are 1 to 1 with their LUN's are serving out the volume
with a very acceptable throughput.
*Unfortunately, the 4 volumes which reside within the monster 1.8 TB LUN get
served out at approx half the throughput speed as that of the 2 solitary
*EMC recommends SAN volumes be configured this way (1 LUN over many disks,
housing multiple LVM's and FS's if need be.
*For testing purposes, I requested new SAN volumes to work.
*These new volumes are 1 to 1 with their LUN's, spanning 8 disks. (4 LVM's
on 4 LUN's spanning 8 disks).
*After putting a GFS2 filesystem on the new volumes, I shared them out.
*My throughput of a 3 GB ISO to 2 of the test volumes is twice as fast as
the throughput on the Filesystems that live on the monster LUN.
***IS THERE SOME SORT OF SAMBA *LIMITATION *REGARDING *MANY LVM's w/ GFS2
FILESYSTEMS ON 1 BIG LUN SPANNING MANY DISKS*?
Brett B. Klingensmith
Sr. Systems Administrator
275 Technology Drive
Canonsburg, PA 15317
The information transmitted is intended only for the person or entity to
which it is addressed and may contain confidential and/or privileged
material. Any review, retransmission, dissemination or other use of, or
taking of any action in reliance upon, this information by persons or
entities other than the intended recipient is prohibited. If you received
this in error, please contact the sender and delete the material from any
More information about the samba