Hi Jan,
Thanks for responding the email, regarding the cluster usage, we are going to used it for non-relational databases, Cassandra, mongoDBs and other apps, so we need that this cluster response well to intense io apps, it's going to be connected to HP enclosures with IB FDR also, and mapped through Cinder to mount it on VMs (KVM hypervisor), then on the vms we are going to run the non-relational dbs.
Thanks in advance,
German
2015-08-27 13:25 GMT-03:00 Jan Schermer <jan@xxxxxxxxxxx>:
Some comments inline.A lot of it depends on your workload, but I'd say you almost certainly need higher-grade SSDs. You can save money on memory.What will be the role of this cluster? VM disks? Object storage? Streaming?...JanOn 27 Aug 2015, at 17:56, German Anders <ganders@xxxxxxxxxxxx> wrote:Hi all,I'm planning to deploy a new Ceph cluster with IB FDR 56Gb/s and I've the following HW:3x MON Servers:2x Intel Xeon E5-2600@v3 8C256GB RAMI don't think you need that much memory, 64GB should be plenty (if that's the only role for the servers).1xIB FRD ADPT-DP (two ports for PUB network)1xGB ADPT-DP
Disk Layout:
SOFT-RAID:SCSI1 (0,0,0) (sda) - 120.0 GB ATA INTEL SSDSC2BB12 (OS-RAID1)SCSI2 (0,0,0) (sdb) - 120.0 GB ATA INTEL SSDSC2BB12 (OS-RAID1)I 100% recommend going with SSDs for the /var/lib/ceph/mon storage, fast ones (but they can be fairly small). Should be the same grade as journal drives IMO.NOT S3500!I can recommend S3610 (just got some :)), Samsung 845 DC PRO. At least 1 DWPD rating, better go with 3 DWPD.8x OSD Servers:2x Intel Xeon E5-2600@v3 10CGo for the fastest you can afford if you need the latency - even at the expense of cores.Go for cores if you want bigger throughput.256GB RAMAgain - I think too much if that's the only role for those nodes, 64GB should be plenty.1xIB FRD ADPT-DP (one port for PUB and one for CLUS network)
1xGB ADPT-DPDisk Layout:SOFT-RAID:SCSI1 (0,0,0) (sda) - 120.0 GB ATA INTEL SSDSC2BB12 (OS-RAID1)
SCSI2 (0,0,0) (sdb) - 120.0 GB ATA INTEL SSDSC2BB12 (OS-RAID1)JBOD:SCSI9 (0,0,0) (sdd) - 120.0 GB ATA INTEL SC3500 SSDSC2BB12 (Journal)
SCSI9 (0,1,0) (sde) - 120.0 GB ATA INTEL SC3500 SSDSC2BB12 (Journal)
SCSI9 (0,2,0) (sdf) - 120.0 GB ATA INTEL SC3500 SSDSC2BB12 (Journal)No no no. Those SSDs will die a horrible death, too little endurance.Better go with 2x 3700 in RAID1 and partition them for journals. Or just don't use journaling drives and buy better SSDs for storage.SCSI9 (0,3,0) (sdg) - 800.2 GB ATA INTEL SC3510 SSDSC2BB80 (Pool-SSD)
SCSI9 (0,4,0) (sdh) - 800.2 GB ATA INTEL SC3510 SSDSC2BB80 (Pool-SSD)
SCSI9 (0,5,0) (sdi) - 800.2 GB ATA INTEL SC3510 SSDSC2BB80 (Pool-SSD)
SCSI9 (0,6,0) (sdj) - 800.2 GB ATA INTEL SC3510 SSDSC2BB80 (Pool-SSD)Too little endurance._______________________________________________
SCSI9 (0,7,0) (sdk) - 3.0 TB SEAGATE ST3000NM0023 (Pool-SATA)
SCSI9 (0,8,0) (sdl) - 3.0 TB SEAGATE ST3000NM0023 (Pool-SATA)
SCSI9 (0,9,0) (sdm) - 3.0 TB SEAGATE ST3000NM0023 (Pool-SATA)
SCSI9 (0,10,0) (sdn) - 3.0 TB SEAGATE ST3000NM0023 (Pool-SATA)
SCSI9 (0,11,0) (sdo) - 3.0 TB SEAGATE ST3000NM0023 (Pool-SATA)I would like to have an expert opinion on what would be the best deploy/config disk pools and crush map? any other advice?Thanks in advance,Best regards,German
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