Regards, Peter
> On 5 Mar 2016, at 02:52, John Dickinson <m...@not.mn> wrote: > > > >> On 3 Mar 2016, at 13:32, Mark Kirkwood wrote: >> >>> On 03/03/16 03:57, Peter Brouwer wrote: >>> Hello >>> >>> I am trying to find some information on the relationship of the ring >>> (builder) structure of swift and the size of disks used, i.e. how is >>> capacity of a disk managed. >>> I've seen many docs/blogs explaining the ring and partitions but I have >>> not seen any info on how available space per disk is managed, i.e. the >>> relationship between disk size and allocating ring partitions. >>> >>> Do all disks in a ring need to be of the same capacity? If not how is >>> swift handling the amount of free space? >>> >>> Any pointers to documentation on this? >> >> You specify a weight for each device that is added to the ring, this >> lets you cope with different sized disks e.g: >> >> Suppose sdb is 1TB and sdc 500GB >> >> $ swift-ring-builder object.builder add r1z1-192.168.122.21:6000/sdb 1 >> $ swift-ring-builder object.builder add r1z1-192.168.122.21:6000/sdc 0.5 > > > One easy way to manage ring weights is to use the number of GB on the drive. > So a 1TB drive is 1000, a 500Gb drive is 500, and an 8TB drive is 8000. Makes > thinking about it easier, at least to me. > > The actual weight doesn't matter by itself. It only matters compared to all > the other weights in the ring. Interesting info. Two followup questions, Can the ring builder cope with a disk that is dynamic in size, like an nfs share from a storage array in which an nfs share shares capacity from a pool, i.e. If an other share in that pool takes up space the nfs share used by swift decrease in capacity. So the thing Im trying to understand is how swift/ringbuilder checks if a disk in a ring is running out of space? > > > --John > > > > >> >> Cheers >> >> Mark >> >> >> _______________________________________________ >> Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack >> Post to : openstack@lists.openstack.org >> Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > _______________________________________________ > Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > Post to : openstack@lists.openstack.org > Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack _______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : openstack@lists.openstack.org Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
