>>Hi, >>Can you test with disabling rbd_cache ? >>I remember of a bug detected in giant, not sure it's also the case for fireflt This was this tracker: http://tracker.ceph.com/issues/9513 But It has been solved and backported to firefly. Also, can you test 0.80.6 and 0.80.7 ? ----- Mail original ----- De: "killingwolf" <killingwolf@xxxxxx> À: "ceph-users" <ceph-users@xxxxxxxxxxxxxx> Envoyé: Jeudi 12 Février 2015 12:16:32 Objet: re： Upgrade 0.80.5 to 0.80.8 --the VM's read requestbecome too slow I have this problems too , Help! ------------------ 原始邮件 ------------------ 发件人: "杨万元";<yangwanyuan8861@xxxxxxxxx>; 发送时间: 2015年2月12日(星期四) 中午11:14 收件人: "ceph-users@xxxxxxxxxxxxxx"<ceph-users@xxxxxxxxxxxxxx>; 主题: Upgrade 0.80.5 to 0.80.8 --the VM's read requestbecome too slow Hello! We use Ceph+Openstack in our private cloud. Recently we upgrade our centos6.5 based cluster from Ceph Emperor to Ceph Firefly. At first,we use redhat yum repo epel to upgrade, this Ceph's version is 0.80.5. First upgrade monitor,then osd,last client. when we complete this upgrade, we boot a VM on the cluster,then use fio to test the io performance. The io performance is as better as before. Everything is ok! Then we upgrade the cluster from 0.80.5 to 0.80.8,when we completed , we reboot the VM to load the newest librbd. after that we also use fio to test the io performance .then we find the randwrite and write is as good as before.but the randread and read is become worse, randwrite's iops from 4000-5000 to 300-400 ,and the latency is worse. the write's bw from 400MB/s to 115MB/s . then I downgrade the ceph client version from 0.80.8 to 0.80.5, then the reslut become normal. So I think maybe something cause about librbd. I compare the 0.80.8 release notes with 0.80.5 ( http://ceph.com/docs/master/release-notes/#v0-80-8-firefly ), I just find this change in 0.80.8 is something about read request : librbd: cap memory utilization for read requests (Jason Dillaman) . Who can explain this？ My ceph cluster is 400osd,5mons : ceph -s health HEALTH_OK monmap e11: 5 mons at {BJ-M1-Cloud71= 172.28.2.71:6789/0,BJ-M1-Cloud73=172.28.2.73:6789/0,BJ-M2-Cloud80=172.28.2.80:6789/0,BJ-M2-Cloud81=172.28.2.81:6789/0,BJ-M3-Cloud85=172.28.2.85:6789/0 }, election epoch 198, quorum 0,1,2,3,4 BJ-M1-Cloud71,BJ-M1-Cloud73,BJ-M2-Cloud80,BJ-M2-Cloud81,BJ-M3-Cloud85 osdmap e120157: 400 osds: 400 up, 400 in pgmap v26161895: 29288 pgs, 6 pools, 20862 GB data, 3014 kobjects 41084 GB used, 323 TB / 363 TB avail 29288 active+clean client io 52640 kB/s rd, 32419 kB/s wr, 5193 op/s The follwing is my ceph client conf : [global] auth_service_required = cephx filestore_xattr_use_omap = true auth_client_required = cephx auth_cluster_required = cephx mon_host = 172.29.204.24,172.29.204.48,172.29.204.55,172.29.204.58,172.29.204.73 mon_initial_members = ZR-F5-Cloud24, ZR-F6-Cloud48, ZR-F7-Cloud55, ZR-F8-Cloud58, ZR-F9-Cloud73 fsid = c01c8e28-304e-47a4-b876-cb93acc2e980 mon osd full ratio = .85 mon osd nearfull ratio = .75 public network = 172.29.204.0/24 mon warn on legacy crush tunables = false [osd] osd op threads = 12 filestore journal writeahead = true filestore merge threshold = 40 filestore split multiple = 8 [client] rbd cache = true rbd cache writethrough until flush = false rbd cache size = 67108864 rbd cache max dirty = 50331648 rbd cache target dirty = 33554432 [client.cinder] admin socket = /var/run/ceph/rbd-$pid.asok My VM is 8core16G,we use fio scripts is : fio -ioengine=libaio -bs=4k -direct=1 -thread -rw=randread -size=60G -filename=/dev/vdb -name="EBS" -iodepth=32 -runtime=200 fio -ioengine=libaio -bs=4k -direct=1 -thread -rw=randwrite -size=60G -filename=/dev/vdb -name="EBS" -iodepth=32 -runtime=200 fio -ioengine=libaio -bs=4k -direct=1 -thread -rw=read -size=60G -filename=/dev/vdb -name="EBS" -iodepth=32 -runtime=200 fio -ioengine=libaio -bs=4k -direct=1 -thread -rw=write -size=60G -filename=/dev/vdb -name="EBS" -iodepth=32 -runtime=200 The following is the io test result ceph client verison :0.80.5 read: bw= 430MB write: bw=420MB randread: iops= 4875 latency=65ms randwrite: iops=6844 latency=46ms ceph client verison :0.80.8 read: bw= 115MB write: bw=480MB randread: iops= 381 latency=83ms randwrite: iops=4843 latency=68ms _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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