[Bug 1057054] [NEW] poor performance after upgrade to Precise

[Chris Weiss]

Public bug reported:

I had a Lucid x64 server working with a Dell MD3000i with 4 paths and
worked as expected.  I added the "prio rdac" line to the conf file, then
upgraded to Precise, and removed the old mpath_rdac line and reboot one
more time, just to be sure.  I did this based on a section in
https://help.ubuntu.com/12.04/serverguide/serverguide.pdf

as a "sanity check" test, I'm doing 'pv < /dev/mapper/dellsas1 >
/dev/null' (friendly names enabled).  On Lucid i'd get about 100MB/s
After upgrading to Precise I get an almost solid 768kB/s.  If I instead
use the 4 underlying /dev/sd* devices, 2 give errors as expected, and 2
run at about 100MB/s as expected so iscsi seems to be working correctly
and multipath not.

** Affects: multipath-tools (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  poor performance after upgrade to Precise

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