that depends.. with which block size do you get those numbers? Ceph is
really good with block sizes > 256kb, 1M, 4M...
German Anders
--- Original message ---
Asunto: [ceph-users] slow read-performance inside the vm
De: Patrik Plank <pat...@plank.me>
Para: ceph-users@lists.ceph.com <ceph-users@lists.ceph.com>
Fecha: Thursday, 08/01/2015 20:21
Hi,
first of all, I am a “ceph-beginner“ so i am sorry for the trivial
questions :).
I have build a ceph three node cluster for virtualization.
Hardware:
Dell Poweredge 2900
8 x 300GB SAS 15k7 with Dell Perc 6/i in Raid 0
2 x 120GB SSD in Raid 1 with Fujitsu Raid Controller for Journal + OS
16GB RAM
2 x Intel Xeon E5410 2,3 Ghz
2 x Dual 1Gb Nic
Configuration
Ceph 0.90
2x Network bonding with 2 x 1 Gb Network (public + cluster Network)
with mtu 9000
read_ahead_kb = 2048
/dev/sda1 on /var/lib/ceph/osd/ceph-0 type xfs
(rw,noatime,attr2,inode64,noquota)
ceph.conf:
[global]
fsid = 1afaa484-1e18-4498-8fab-a31c0be230dd
mon_initial_members = ceph01
mon_host = 10.0.0.20,10.0.0.21,10.0.0.22
auth_cluster_required = cephx
auth_service_required = cephx
auth_client_required = cephx
filestore_xattr_use_omap = true
public_network = 10.0.0.0/24
cluster_network = 10.0.1.0/24
osd_pool_default_size = 3
osd_pool_default_min_size = 1
osd_pool_default_pg_num = 128
osd_pool_default_pgp_num = 128
filestore_flusher = false
[client]
rbd_cache = true
rbd_readahead_trigger_requests = 50
rbd_readahead_max_bytes = 4096
rbd_readahead_disable_after_bytes = 0
rados bench -p kvm 200 write –no-cleanup
Total time run: 201.139795
Total writes made: 3403
Write size: 4194304
Bandwidth (MB/sec): 67.674
Stddev Bandwidth: 66.7865
Max bandwidth (MB/sec): 212
Min bandwidth (MB/sec): 0
Average Latency: 0.945577
Stddev Latency: 1.65121
Max latency: 13.6154
Min latency: 0.085628
rados bench -p kvm 200 seq
Total time run: 63.755990
Total reads made: 3403
Read size: 4194304
Bandwidth (MB/sec): 213.502
Average Latency: 0.299648
Max latency: 1.00783
Min latency: 0.057656
So here my questions:
With these values above, I get a write performance of 90Mb/s and read
performance of 29Mb/s, inside the VM. (Windows 2008/R2 with virtio
driver and writeback-cache enabled)
Are these values normal with my configuration and hardware? -> The
read-performance seems slow.
Would the read-performance better if I run for every single disk a
osd?
Best regards
Patrik
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