Hi, I am building my first Ceph cluster from hardware leftover from a previous project. I have been reading a lot of Ceph documentation but need some help to make sure I going the right way. To set the stage below is what I have
Rack-1 1 x HP DL360 G9 with - 256 GB Memory - 5 x 300GB HDD - 2 x HBA SAS - 4 x 10GBe Networking Card 1 x SuperMicro chassis with 17 x HP Enterprise 400GB SSD and 17 x HP Enterprise 1.7TB HDD Chassis and HP server are connected with 2 x SAS HBA for redundancy. Rack-2 (Same as Rack-1) 1 x HP DL360 G9 with - 256 GB Memory - 5 x 300GB HDD - 2 x HBA SAS - 4 x 10GBe Networking Card 1 x SuperMicro chassis with 17 x HP Enterprise 400GB SSD and 17 x HP Enterprise 1.7TB HDD Chassis and HP server are connected with 2 x SAS HBA for redundancy. Rack-3 5 x HP DL360 G8 with - 128 GB Memory - 2 x 400GB HP Enterprise SSD - 3 x 1.7TB Enterprise HDD Requirements - To serve storage to around 200 VMware VMs via iSCSI. VMs use disks moderately. - To serve storage to some docker containers using ceph volume driver - To serve storage to some legacy apps using NFS Plan - Create a ceph cluster with all machines - Use Bluestore as osd backing ( 3 x SSD for DB and WAL in SuperMicro Chassis and 1 x SSD for DB and WAL in Rack 3 G8s) - Use remaining SSDs ( 14 x in SuperMicro and 1 x Rack 3 G8s ) for Rados Cache Tier - Update CRUSH map to make Rack as minimum failure domain. So almost all data is replicated across racks and in case one of the host dies the storage still works. - Single bonded network (4x10GBe) connected to ToR switches. - Same public and cluster network Questions - First of all, is this kind of setup workable. - I have seen that Ceph uses /dev/sdx names in guides, is it a good approach considering the disks die and can come up with different /dev/sdx identifier on reboot. - What should be the approx size of WAL and DB partitions for my kind of setup? - Can i install ceph in a VM and use other VMs on these hosts. Is Ceph too CPU demanding? Thanks, Shantur
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