Re: [ceph-users] Advises for a new Ceph cluster

2014-02-19 Thread shacky
2014-02-19 9:40 GMT+01:00 Schlacta, Christ : > In just the last week I've seen at least two failures as a result of > replication factor two. I would highly suggest that for any critical data > you choose an rf of at least three. > Could you explain me why failures happened? > With your stated ca

Re: [ceph-users] Advises for a new Ceph cluster

2014-02-19 Thread shacky
2014-02-19 9:31 GMT+01:00 Robert Sander : > > Drop RAID5 and create one OSD per harddisk. > I was thinking about using RAID5 to keep the disk redundancy even during the file sync process through the nodes. What do you think about this? > If you need to store small files consider how your applica

Re: [ceph-users] Advises for a new Ceph cluster

2014-02-19 Thread Schlacta, Christ
In just the last week I've seen at least two failures as a result of replication factor two. I would highly suggest that for any critical data you choose an rf of at least three. With your stated capacity, you're looking at a mere 16TB with rf3. You'll need to look into slightly more capacity or w

Re: [ceph-users] Advises for a new Ceph cluster

2014-02-19 Thread Robert Sander
On 18.02.2014 21:41, shacky wrote: > Hi. > > I have to create a new Ceph cluster with 3 nodes with 4 hard drives in > RAID5 (12Tb available per node). Drop RAID5 and create one OSD per harddisk. If you need to store small files consider how your applications communicates with the storage cluster

[ceph-users] Advises for a new Ceph cluster

2014-02-18 Thread shacky
Hi. I have to create a new Ceph cluster with 3 nodes with 4 hard drives in RAID5 (12Tb available per node). I will need 18Tb of available space, so I will create two OSDs per node with a replication factor of 2, and my data will be safe if a node will fail, right? Can you advise me a good configu