[ceph-users] firefly and cache tiers

2014-11-20 Thread Lindsay Mathieson
Are cache tiers reliable in firefly if you *aren't* using erasure pools? Secondary to that - do they give a big boost with regard to read/write performance for VM images? any real world feedback? thanks, -- Lindsay signature.asc Description: This is a digitally signed message part.

Re: [ceph-users] firefly and cache tiers

2014-11-20 Thread Mark Nelson
Personally I'd suggest a lot of testing first. Not sure if there are any lingering stability issues, but as far as performance goes in firefly you'll only likely see speed ups with very skewed hot/cold distributions and potentially slow downs in the general case unless you have an extremely

Re: [ceph-users] firefly and cache tiers

2014-11-20 Thread Lindsay Mathieson
On Thu, 20 Nov 2014 03:12:44 PM Mark Nelson wrote: Personally I'd suggest a lot of testing first. Not sure if there are any lingering stability issues, but as far as performance goes in firefly you'll only likely see speed ups with very skewed hot/cold distributions and potentially slow

Re: [ceph-users] firefly and cache tiers

2014-11-20 Thread Mark Nelson
On 11/20/2014 03:17 PM, Lindsay Mathieson wrote: On Thu, 20 Nov 2014 03:12:44 PM Mark Nelson wrote: Personally I'd suggest a lot of testing first. Not sure if there are any lingering stability issues, but as far as performance goes in firefly you'll only likely see speed ups with very skewed