Re: [ceph-users] Review of Ceph on ZFS - or how not to deploy Ceph for RBD + OpenStack

On 11-1-2017 08:06, Adrian Saul wrote: > > I would concur having spent a lot of time on ZFS on Solaris. > > ZIL will reduce the fragmentation problem a lot (because it is not > doing intent logging into the filesystem itself which fragments the > block allocations) and write response will be a

Re: [ceph-users] Review of Ceph on ZFS - or how not to deploy Ceph for RBD + OpenStack

I would concur having spent a lot of time on ZFS on Solaris. ZIL will reduce the fragmentation problem a lot (because it is not doing intent logging into the filesystem itself which fragments the block allocations) and write response will be a lot better. I would use different devices for

Re: [ceph-users] Review of Ceph on ZFS - or how not to deploy Ceph for RBD + OpenStack

Hello Kevin, On Tue, Jan 10, 2017 at 4:21 PM, Kevin Olbrich wrote: > 5x Ceph node equipped with 32GB RAM, Intel i5, Intel DC P3700 NVMe journal, Is the "journal" used as a ZIL? > We experienced a lot of io blocks (X requests blocked > 32 sec) when a lot > of data is changed in

Re: [ceph-users] Review of Ceph on ZFS - or how not to deploy Ceph for RBD + OpenStack

On 11/01/2017 7:21 AM, Kevin Olbrich wrote: Read-Cache using normal Samsung PRO SSDs works very well How did you implement the cache and measure the results? a ZFS ssd cache will perform very badly with VM hosting and/or distriibuted filesystems, the random nature of the I/O and the ARC

[ceph-users] Review of Ceph on ZFS - or how not to deploy Ceph for RBD + OpenStack

Dear Ceph-users, just to make sure nobody makes the mistake, I would like to share my experience with Ceph on ZFS in our test lab. ZFS is a Copy-on-Write filesystem and is suitable IMHO where data resilience has high priority. I work for a mid-sized datacenter in Germany and we set up a cluster