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2010 Sep 13
2
1.8.4 and write-through cache
Afternoon
I upgraded our oss''s from 1.8.3 to 1.8.4 on Saturday (due to
https://bugzilla.lustre.org/show_bug.cgi?id=22755) and suffered a
great deal of pain.
We have 30 oss''s of multiple vintages. The basic difference between them is
* md on first 20 nodes
* 3ware 9650SE ML12 on last 10 nodes
After the upgrade to 1.8.4 we were seeing terrible throughput on the
nodes with 3ware cards (and only the nodes with 3ware cards). This
was typified by see the block device being 100% utilised (iostat),
doing about 100r/s and 400kb/s and all the ost_io threads in D state
(no writ...