[LU-618] Reads are not included in IO accounting

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.11.0, Lustre 2.10.3
• Affects Version/s: Lustre 1.8.7, Lustre 1.8.6
• Environment: Linux, Lustre b1_8
• Severity: 3
• Bugzilla ID: 24,536
• Assignee: Hongchao Zhang
• Reporter: Mark Hills

Description

Writes are accounted for, but not reads. The supplied patch fixes this.

It seems that the accounting it normally done in the kernels page writeback and readahead
functionality. Therefore as Lustre implements its own readahead, it must also maintain its own
accounting on reads (but not writes).

Previously discussed in:

• http://lists.lustre.org/pipermail/lustre-devel-lustre.org/2011-April/001586.html
• https://bugzilla.lustre.org/show_bug.cgi?id=24536

Issue Links

• Trackbacks: Lustre 1.8.x known issues tracker While testing against Lustre b18 branch, we would hit known bugs which were already reported in Lustre Bugzilla https://bugzilla.lustre.org/. In order to move away from relying on Bugzilla, we would create a JIRA