[ceph-users] Bluestore disk colocation using NVRAM, SSD and SATA
Hi guys i'm reading different documents about bluestore, and it never recommends to use NVRAM to store the bluefs db, nevertheless the official documentation says that, is better to use the faster device to put the block.db in. In my cluster i have NVRAM devices of 400GB, SSDs disks for high performance and SATA disks for cold storage. So how do i have to deploy using bluestore, regarding where i should put block.wal and block.db ? Do i have to use the NVRAM just for the block.wal and put the the block.db in the same SATA and SSD disks as the DATA ? or should i have to use NVRAM for both block.wal and block.db ? Any idea if exists some special constraint about putting block.db into NVRAM, even when the backend disk is an SSD ? Thanks in Advanced. *Maximiliano Venesio* *Chief Cloud Architect | NUBELIU* E-mail: massimo@nubeliu.comCell: +54 9 11 3770 1853 _ www.nubeliu.com ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
[ceph-users] Changing replica size of a running pool
Guys hi. I have a Jewel Cluster composed by two storage servers which are configured on the crush map as different buckets to store data. I've to configure two new pools on this cluster with the certainty that i'll have to add more servers in a short term. Taking into account that the recommended replication size for every pool is 3, i'm thinking in two possible scenarios. 1) Set the replica size in 2 now, and in the future change the replica size to 3 on a running pool. Is that possible? Can i have serious issues with the rebalance of the pgs, changing the pool size on the fly ? 2) Set the replica size to 3, and change the ruleset to replicate by OSD instead of HOST now, and in the future change this rule in the ruleset to replicate again by host in a running pool. Is that possible? Can i have serious issues with the rebalance of the pgs, changing the ruleset in a running pool ? Which do you think is the best option ? Thanks in advanced. Maximiliano Venesio Chief Cloud Architect | NUBELIU E-mail: massimo@nubeliu.comCell: +54 9 11 3770 1853 _ www.nubeliu.com ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
