Doss, did you ever get a response from EMC gurus?

We are seeing several, similar "Buffer I/O error on device emcpower" on several gatekeeper devices on a couple of our Linux boxes. These are gatekeeper devices from VMAXes. Though no negative impact, the errors are constantly writing to /var/log/messages.

Hi Kennedy,

> Firstly is it possible to set ALUA mode on VPLEX?

No, VPLEX front-end does not advertise itself as alua capable.  All paths are active and can accept I/O.  No concept of preferred or non-preferred paths.

> These Linux boxes have powerpath running on them, btw

Hmm, funny then that you don't see any warnings from emcpower devices.  I don't know if you have any Linux native multipathing also configured, but I'm guessing it's probably not a good idea to have more than one multipathing software installed and managing devices.

I wonder if the specific logical block is consistent or not.

I'd check VPLEX performance stats for any kind of front-end aborts, and check the fabric for any kind of dropped frames.

Good luck,

Gary