Re: [PVE-User] Ceph Cache Tiering

2016-10-11 Thread Lindsay Mathieson
On 12 October 2016 at 13:28, Adam Thompson wrote: > Not a bloody chance... WriteBack is the only thing that gives both acceptable > performance characteristics and data guarantees. Eh? I didn't think writeback gave data guarantees, quite the opposite. -- Lindsay

Re: [PVE-User] Ceph Cache Tiering

2016-10-11 Thread Adam Thompson
Not a bloody chance... WriteBack is the only thing that gives both acceptable performance characteristics and data guarantees. (The NFS file server running ZFS is running in sync=disabled mode, but it also has dual power supplies connected to dual UPSes, and I'm willing to take the chance of a

Re: [PVE-User] Ceph Cache Tiering

2016-10-11 Thread Lindsay Mathieson
On 11/10/2016 6:39 PM, Eneko Lacunza wrote: I linked the bugreport, not that I care really :) If you read through the bug report it turns out to be: a). an xattr issue, not filename size b). A bug in ceph which assumes that the zfs max xattr size is far smaller than it is. They're not

Re: [PVE-User] Ceph Cache Tiering

2016-10-11 Thread Lindsay Mathieson
On 11/10/2016 8:26 PM, Emmanuel Kasper wrote: ut of Curiosity, I suppose you're using the default 'NoCache' as the cache mode of those QCOW2 images ? Not on ZFS, which doesn't support O_DIRECT, you need to use writethrough or writeback. -- Lindsay Mathieson

Re: [PVE-User] Ceph Cache Tiering

2016-10-11 Thread Emmanuel Kasper
On 10/10/2016 04:29 PM, Adam Thompson wrote: > The default PVE setup puts an XFS filesystem onto each "full disk" assigned > to CEPH. CEPH does **not** write directly to raw devices, so the choice of > filesystem is largely irrelevant. > Granted, ZFS is a "heavier" filesystem than XFS, but it's

Re: [PVE-User] P2V Windows2003 Server (AD)

2016-10-11 Thread HK 590 Dicky 梁家棋 資科
Dear Jean R. Franco many thanks for your info., i just follow the steps and success migrate physical server to VM, because the old accounting software is installed on this software, actually domain and DB is upgraded to new version on new windows 2012 server, i just move to VM for backup,

Re: [PVE-User] ceph - slow rbd ls -l

2016-10-11 Thread Eneko Lacunza
Hi, El 11/10/16 a las 03:43, Thiago Damas escribió: 2016-10-10 20:47 GMT-03:00 Lindsay Mathieson : On 11/10/2016 7:59 AM, Thiago Damas wrote: I'm experiencing some timeouts when creating new disks/VMs, using a ceph storage. Is there some way to reduce the

Re: [PVE-User] Ceph Cache Tiering

2016-10-11 Thread Eneko Lacunza
El 10/10/16 a las 23:24, Lindsay Mathieson escribió: On 11/10/2016 2:05 AM, Eneko Lacunza wrote: And there are known limits/problems with ext4 for example, and seems that also apply to zfsonlinux No they do not. I linked the bugreport, not that I care really :) Anyway it seems they're