3node HCI PVE+Ceph all SSD low write performance

cyber035

Active Member
Jun 24, 2017
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Hi all, I have a test Lab with specs:

3 node HP dl360 gen9
32 x Intel(R) Xeon(R) CPU E5-2630 v3 @ 2.40GHz (2 Sockets)
96GB DDR4 ECC ram
3x Samsung PM1643 SAS SSD 1.92 TB /per node = 9 CEPH OSD SSDs in total
2x Intel 240gb SSD for OS /per node - zfs raid1 PVE OS setup
3x dual 10gb lan /per node - LACP bond0 CEPH_STORAGE traffic, LACP bond1 PVE CLUSTER traffic, LACP bond2 VM traffic - all 9000mtu
PVE 6.4-13
Ceph 15.2.13

Setup:
Size:3
Min Size:2
replicated_rule
PG: 256
PG Auto Scale: off

Created a RBD storage, and created hard disk for vm:

Bus/Device: SCSI
SCSI Controller: VirtIO SCSI
Size: 32GiB
IO thread: enabled
Cache: Default (No cache)


Ceph 9xOSDs storage :

scsi 256.png




Single SSD Directory storage:

single ssd.png



Does someone else have similar experience with lower write speeds in similar setup?

Any suggestions on how to increase the write speed or is this expected?

I cant add/modify the hardware just tune the general setup if necessary.

Thanks