Re: [ovirt-users] Hyperconverged Setup and Gluster healing

2017-04-25 Thread FERNANDO FREDIANI
RAID 6 doesn't make exactly 3 copies of data. I think storage is too expensive when compared to the total cost of the platform that 3 copies is waste of storage or luxury, given than if you have a permanent failure you still can make a new 2nd copy of the data provided you have storage left

Re: [ovirt-users] Hyperconverged Setup and Gluster healing

2017-04-25 Thread Donny Davis
I personally want three copies of my data, more akin to RAID 6(ish) so in my case replica 3 makes perfect sense. On Mon, Apr 24, 2017 at 11:34 AM, Denis Chaplygin wrote: > Hello! > > On Mon, Apr 24, 2017 at 5:08 PM, FERNANDO FREDIANI < > fernando.fredi...@upx.com> wrote: >

Re: [ovirt-users] Hyperconverged Setup and Gluster healing

2017-04-24 Thread Denis Chaplygin
Hello! On Mon, Apr 24, 2017 at 5:08 PM, FERNANDO FREDIANI < fernando.fredi...@upx.com> wrote: > Hi Denis, understood. > What if in the case of adding a fourth host to the running cluster, will > the copy of data be kept only twice in any of the 4 servers ? > replica volumes can be build only

Re: [ovirt-users] Hyperconverged Setup and Gluster healing

2017-04-24 Thread FERNANDO FREDIANI
Ok, great, thanks for the clarification. Therefore a replica 3 configuration means raw storage space cost is 'similar' to a RAID 1 and actual data exists only 2 times and two different servers. Regards Fernando On 24/04/2017 11:35, Denis Chaplygin wrote: With arbiter volume you still have

Re: [ovirt-users] Hyperconverged Setup and Gluster healing

2017-04-24 Thread Denis Chaplygin
With arbiter volume you still have a replica 3 volume, meaning that you have three participants in your quorum. But only two of those participants keep the actual data. Third one, the arbiter, stores only some metadata, not the files content, so data is not replicated 3 times. On Mon, Apr 24,

Re: [ovirt-users] Hyperconverged Setup and Gluster healing

2017-04-24 Thread Denis Chaplygin
Hello! On Mon, Apr 24, 2017 at 3:02 PM, FERNANDO FREDIANI < fernando.fredi...@upx.com> wrote: > Out of curiosity, why do you and people in general use more replica 3 than > replica 2 ? > The answer is simple - quorum. With just two participants you don't know what to do, when your peer is

Re: [ovirt-users] Hyperconverged Setup and Gluster healing

2017-04-24 Thread FERNANDO FREDIANI
Hello. Out of curiosity, why do you and people in general use more replica 3 than replica 2 ? If I understand correctly this seems overkill and waste of storage as 2 copies of data (replica 2) seems pretty reasonable similar to RAID 1 and still in the worst case the data can be replicated

Re: [ovirt-users] Hyperconverged Setup and Gluster healing

2017-04-24 Thread knarra
Achtelik <sven.achte...@eps.aero>; users@ovirt.org *Betreff:* Re: [ovirt-users] Hyperconverged Setup and Gluster healing On 04/24/2017 05:03 PM, Sven Achtelik wrote: Hi All, my oVirt-Setup is 3 Hosts with gluster and reaplica 3. I always try to stay on the current version and I’m ap

Re: [ovirt-users] Hyperconverged Setup and Gluster healing

2017-04-24 Thread Sven Achtelik
-users] Hyperconverged Setup and Gluster healing On 04/24/2017 05:03 PM, Sven Achtelik wrote: Hi All, my oVirt-Setup is 3 Hosts with gluster and reaplica 3. I always try to stay on the current version and I'm applying updates/upgrade if there are any. For this I put a host in maintenance and al

Re: [ovirt-users] Hyperconverged Setup and Gluster healing

2017-04-24 Thread knarra
On 04/24/2017 05:03 PM, Sven Achtelik wrote: Hi All, my oVirt-Setup is 3 Hosts with gluster and reaplica 3. I always try to stay on the current version and I’m applying updates/upgrade if there are any. For this I put a host in maintenance and also use the “Stop Gluster Service” checkbox.