Bug 672238

verified with vdsm22-4.5-63.13.el5_6,

Device:         rrqm/s   wrqm/s   r/s   w/s   rsec/s   wsec/s avgrq-sz avgqu-sz
  await  svctm  %util
sda               0.01    45.52  0.03 20.20     0.68   525.75    26.02     0.20
   9.81   5.42  10.97
sda1              0.00     0.00  0.00  0.00     0.00     0.00    13.33     0.00
   4.26   4.09   0.00
sda2              0.01    45.52  0.03 20.20     0.68   525.75    26.03     0.20
   9.81   5.42  10.97
dm-0              0.00     0.00  0.04 65.72     0.68   525.75     8.01     1.20
  18.22   1.67  10.97
dm-1              0.00     0.00  0.00  0.00     0.00     0.00     8.00     0.00
   5.14   1.31   0.00
dm-14             0.00     0.00  1.00  0.00     8.03     0.00     8.00     0.00
   0.02   0.02   0.00
dm-34             0.00     0.00  0.99  0.01     7.93     0.94     8.85     0.00
   3.11   0.02   0.00
dm-15             0.00     0.00  0.44  0.00     3.44     0.00     7.75     0.00

moving back to assign due to VDSM RPM needs to have dependencies of the following pack! coreutils-5.97-23.el5_6.3.

Checked on vdsm22-4.5-63.14.el5_6.

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Hosts that hold the SPM role access storage in-efficiently when periodically querying their inbox. These in-efficient reads result in unnecessary I/O operations and performance degradation in environments that use SAN storage. The VDSM package has been updated to use more I/O efficient reads. The SPM now uses less I/O operations for each periodic inbox read.

    Technical note updated. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    Diffed Contents:
@@ -1 +1,6 @@
-Hosts that hold the SPM role access storage in-efficiently when periodically querying their inbox. These in-efficient reads result in unnecessary I/O operations and performance degradation in environments that use SAN storage. The VDSM package has been updated to use more I/O efficient reads. The SPM now uses less I/O operations for each periodic inbox read.+C: Hosts that hold the SPM role perform additional I/O operations when periodically querying their inbox.
+C: The additional I/O operations result in performance degradation in environments that are backed by SAN storage.
+F: VDSM no longer performs additional un-necessary I/O when it periodically polls the inbox.
+R: The SPM uses less I/O operations.
+
+Text: Hosts that hold the SPM role perform additional I/O operations when periodically querying their inbox. The additional I/O operations result in performance degradation in environments that are backed by SAN storage. VDSM no longer performs additional un-necessary I/O when it periodically polls the inbox. The SPM uses less I/O operations.

    Technical note updated. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    Diffed Contents:
@@ -1,6 +1,6 @@
 C: Hosts that hold the SPM role perform additional I/O operations when periodically querying their inbox.
 C: The additional I/O operations result in performance degradation in environments that are backed by SAN storage.
-F: VDSM no longer performs additional un-necessary I/O when it periodically polls the inbox.
+F: The vdsm22-4.5-63.14.el5_6 package does not perform additional un-necessary I/O when it periodically polls the inbox.
 R: The SPM uses less I/O operations.
 
 Text: Hosts that hold the SPM role perform additional I/O operations when periodically querying their inbox. The additional I/O operations result in performance degradation in environments that are backed by SAN storage. VDSM no longer performs additional un-necessary I/O when it periodically polls the inbox. The SPM uses less I/O operations.

    Technical note updated. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    Diffed Contents:
@@ -1,6 +1,6 @@
-C: Hosts that hold the SPM role perform additional I/O operations when periodically querying their inbox.
-C: The additional I/O operations result in performance degradation in environments that are backed by SAN storage.
-F: The vdsm22-4.5-63.14.el5_6 package does not perform additional un-necessary I/O when it periodically polls the inbox.
+C: On Red Hat Enterprise Linux 5.6 hosts that held the SPM role performed additional I/O operations when periodically querying their inbox.
+C: The additional I/O operations resulted in performance degradation in environments that were backed by SAN storage.
+F: As of the vdsm22-4.5-63.14.el5_6 package vdsm does not perform additional un-necessary I/O when it periodically polls the inbox.
 R: The SPM uses less I/O operations.
 
-Text: Hosts that hold the SPM role perform additional I/O operations when periodically querying their inbox. The additional I/O operations result in performance degradation in environments that are backed by SAN storage. VDSM no longer performs additional un-necessary I/O when it periodically polls the inbox. The SPM uses less I/O operations.+Text: On Red Hat Enterprise Linux 5.6 hosts that held the SPM role performed additional I/O operations when periodically querying their inbox. The additional I/O operations resulted in performance degradation in environments that were backed by SAN storage. As of the vdsm22-4.5-63.14.el5_6 package vdsm does not perform additional un-necessary I/O when it periodically polls the inbox. The SPM uses less I/O operations.

    Technical note updated. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    Diffed Contents:
@@ -3,4 +3,4 @@
 F: As of the vdsm22-4.5-63.14.el5_6 package vdsm does not perform additional un-necessary I/O when it periodically polls the inbox.
 R: The SPM uses less I/O operations.
 
-Text: On Red Hat Enterprise Linux 5.6 hosts that held the SPM role performed additional I/O operations when periodically querying their inbox. The additional I/O operations resulted in performance degradation in environments that were backed by SAN storage. As of the vdsm22-4.5-63.14.el5_6 package vdsm does not perform additional un-necessary I/O when it periodically polls the inbox. The SPM uses less I/O operations.+Text: Hosts that held the SPM role performed additional I/O operations when periodically querying their inbox. The additional I/O operations resulted in performance degradation in environments that were backed by SAN storage. With this update, VDSM does not perform additional un-necessary I/O when it periodically polls the inbox. As a result, I/O overhead on the SPM is reduced.

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2011-0319.html