Re: [ceph-users] (no subject)

Use qemu-img-convert to convert from one format to another. Regards, Anand On Mon, Jul 11, 2016 at 9:37 PM, Gaurav Goyal wrote: > Thanks! > > I need to create a VM having qcow2 image file as 6.7 GB but raw image as > 600GB which is too big. > Is there a way that i

Re: [ceph-users] Filestore merge and split

Merge happens either due to movement of objects due to CRUSH recalculation (when cluster grows or shrinks due to various reasons) or deletion of objects. Split happens when portions of objects/volumes get populated that were previously sparse. Each RADOS object by default is 4MB chunk and volumes

Re: [ceph-users] RBD - Deletion / Discard - IO Impact

These are known problem. Are you doing mkfs.xfs on SSD? If so, please check SSD data sheets whether UNMAP is supported. To avoid unmap during mkfs, use mkfs.xfs -K Regards, Anand On Thu, Jul 7, 2016 at 5:23 PM, Nick Fisk wrote: > Hi All, > > > > Does anybody else see a

[ceph-users] Regarding GET BUCKET ACL REST call

Hi, When GET BUCKET ACL REST call is issued with X-Auth-Token set, call fails. This is due to bucket in question not having CORS settings. Is there a way to set CORS on the S3 bucket with REST APIs? I know a way using boto S3 that works. I am looking for REST APIs for CORS setting. Regards,

Re: [ceph-users] ceph pg level IO sequence

Correct. This is guaranteed. Regards, Anand On Fri, Jun 24, 2016 at 10:37 AM, min fang wrote: > Hi, as my understanding, in PG level, IOs are execute in a sequential way, > such as the following cases: > > Case 1: > Write A, Write B, Write C to the same data area in a

Re: [ceph-users] Ceph file change monitor

I think you are looking for inotify/fanotify events for Ceph. Usually these are implemented for local file system. Ceph being a networked file system, it will not be easy to implement and will involve network traffic to generate events. Not sure it is in the plan though. Regards, Anand On Wed,

Re: [ceph-users] civetweb vs Apache for rgw

For performance, civetweb is better as fastcgi module associated with apache is single threaded. But Apache does have fancy features which civetweb lacks. If you are looking for just the performance, then go for civetweb. Regards, Anand On Mon, May 23, 2016 at 12:43 PM, fridifree

Re: [ceph-users] ceph -s output

Check states of PGs using "ceph pg dump" and for every PG that is not "active+clean", issue "ceph pg map " and get mapping OSDs. Check the state of those OSDs by looking at their logs under /var/log/ceph/. Regards, Anand On Mon, May 23, 2016 at 6:53 AM, Ken Peng wrote: > Hi,

Re: [ceph-users] IRQ balancing, distribution

Page reclamation in Linux is NUMA aware. So page reclamation is not an issue. You can see performance improvements only if all the components of a given IO completes on a single core. This is hard to achieve in Ceph as a single IO goes through multiple thread switches and the threads are not

[ceph-users] Regarding ceph osd setmaxosd

Hi, I have question on intention of Ceph setmaxosd command. From source code, it appears as if this is present as a way to limit the number of OSDs in the Ceph cluster. Can this be used to shrink the number of OSDs in the cluster without gracefully shutting down OSDs and letting