https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 https://jira.whamcloud.com/browse/LUDOC-144 Lustre Documentation <p>In section 31.2.6. Watching the OST Block I/O Stream</p> <p>a. The table is misaligned<br/> b. Some row headings read differently than in Lustre 1.8.9 (version specific?)<br/> discont pages vs. discontiguous pages (same with blocks)<br/> c. Should have some live data in the table instead of all "0's"<br/> d. Descriptions of discontiguous pages and blocks should be more descriptive, and ideally indicate what may be causing those numbers.<br/> e. Some row headings do not have descriptions. Should also follow "d" above.</p> LUDOC-144

Watching the OST Block I/O Stream (Ch 31)

Bug Minor Resolved Fixed Linda Bebernes Brett Lee QContent Mon, 22 Apr 2013 16:15:00 +0000 Thu, 18 Jul 2013 01:50:14 +0000 Thu, 18 Jul 2013 01:50:14 +0000 0 2 <p>Clarification from Andreas on the meaning of discontiguous pages and blocks:</p> <p>The distinction is that in brw_stats "pages" refer to what the client submitted in the RPC, while "blocks" refer to what the OST submitted to disk. If there are discontiguous pages it means random or small IO submitted by the client. Discontiguous blocks relate to on-disk fragmentation.</p> <p>1. brw_stats - "discontiguous pages" refers to data from a client in an RPC that is not in contiguous pages, indicating small or random IO.<br/> 2. brw_stats - "discontiguous blocks" refers to an IO operation that did not write sequential blocks of data, such as would be seen with small or random IO.<br/> 3. brw_stats - "disk fragmented I/Os" refers to writing to fragmented files, indicating there are not sufficient sequential blocks available on target.</p> <p>Changes are ready for review at <a href="http://review.whamcloud.com/#/c/6941/" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/#/c/6941/</a></p> <p>Change merged 7/16</p> Business Value 4.25 Development Rank 1|hzvonb: Rank (Obsolete) 7818 Severity