XFS hangs and freezes with LSI 9265-8i controller on high i/o

[Stan Hoeppner]

On 6/13/2012 7:13 AM, Michael Monnerie wrote:

> Write Cache DISABLED if Bad BBU

This is the LSI/3ware firmware default policy Michael, so every user is
safe out-of-the-box.  If the BBU/FBU is not present (never installed),
or the control logic determines it is not functioning properly, the
firmware disables writeback caching.

In absence of paying attention to logs/alerts, one will know pretty
quickly when the BBU has failed, as write performance with many/most
workloads will fall off a cliff.

-- 
Stan