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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https://bugs.launchpad.net/bugs/1057054
Title:
poor performance after upgrade to Precise
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