Dear All,

We had a power outage and we recovered perfectly fine, except 2 of the OSS server mounting the OST’s over IB from the DDN storage seem to be dead slow. Read is perfectly fine I get a pretty good read performance, about 1200 MB/s. But write is like 4MB/s where as other OST’s on other OSS’s are doing perfectly fine about 350MB/s.

No hardware errors on OSS servers, Storage controllers etc. Storage controllers, connecting these two OSS with issues also, serves two other OSS’s and their performance is perfectly fine.

Any help or direction to debug this will be very helpful. I am running out of ideas on what could cause this. Could it be it takes a while to recover since the file system crashed.

Thank you,

Amit