On 16/04/2020 04:26, Flanders, Dean wrote:
Hello All,
As IBM has completely switched to capacity based licensing in order to
use SS v5 I was wondering how others are dealing with this? We do not
find the capacity based licensing sustainable. Our long term plan is to
migrate away from SS v5 to Lustre, and based on the Lustre roadmap we
have seen it should have the features we need within the next ~1 year
(we are fortunate to have good contacts).
The problem is the features of Lustre that are missing in GPFS :-)
For example have they removed the Lustre feature where roughly
biannually the metadata server kernel panics introducing incorrectable
corruption into the file system that will within six months cause
constant crashes of the metadata node to the point where the file system
is unusable?
In best slashdot car analogy GPFS is like driving round in a Aston
Martin DB9, where Lustre is like having a Ford Pinto. You will never be
happy with Pinto in my experience having gone from the DB9 to the Pinto
and back to the DB9.
That said if you use Lustre as a high performance scratch file system
fro HPC and every ~6 months do a shutdown and upgrade, and at the same
time reformat your Lustre file system you will be fine.
Our experience with Lustre was so bad we specifically excluded it as an
option for our current HPC system when it went out to tender.
JAB.
--
Jonathan A. Buzzard Tel: +44141-5483420
HPC System Administrator, ARCHIE-WeSt.
University of Strathclyde, John Anderson Building, Glasgow. G4 0NG
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