steveg wrote:
Hi,
just to let everyone know in case they stumble into the same problem. HP upgraded the 3par from 3.1.3 to 3.2.1 P04 and that disabled the WCE bit on the presented SCSI devices and now we are seeing write merges and its looking quite a bit better from early results
Issue ID 104168 in the 3.2.1 release notes.
Hmm, so they lie to the OS and say that they aren't caching writes. Not sure I'm a fan, sure it improves performance but it might lead to issues. I mean the write cache is supposed to be nonvolatile, but bugs happen and if the OS has failed to issue a flush because it's assuming there is no cache them that could lead to data corruption.