Re: [ceph-users] ceph Performance random write is more then sequential

mit Gaur" > À: "Florent MONTHEL" > Cc: "ceph-users" > Envoyé: Lundi 2 Février 2015 03:54:36 > Objet: Re: [ceph-users] ceph Performance random write is more then > sequential > > Hi All, > What I saw after enabling RBD cache it is working as expe

Re: [ceph-users] ceph Performance random write is more then sequential

rkload. you'll do less ios but bigger ios to ceph, so less cpus, - Mail original - De: "Sumit Gaur" À: "Florent MONTHEL" Cc: "ceph-users" Envoyé: Lundi 2 Février 2015 03:54:36 Objet: Re: [ceph-users] ceph Performance random write is more then

Re: [ceph-users] ceph Performance random write is more then sequential

Hope this is helpful. > > > > Thanks & Regards > > Somnath > > > > > > *From:* ceph-users [mailto:ceph-users-boun...@lists.ceph.com] *On Behalf > Of *Sumit Gaur > *Sent:* Sunday, February 01, 2015 6:55 PM > *To:* Florent MONTHEL > *Cc:* ceph-users@lists.c

Re: [ceph-users] ceph Performance random write is more then sequential

nday, February 01, 2015 6:55 PM To: Florent MONTHEL Cc: ceph-users@lists.ceph.com Subject: Re: [ceph-users] ceph Performance random write is more then sequential Hi All, What I saw after enabling RBD cache it is working as expected, means sequential write has better MBps than random write.

Re: [ceph-users] ceph Performance random write is more then sequential

Hi All, What I saw after enabling RBD cache it is working as expected, means sequential write has better MBps than random write. can somebody explain this behaviour ? Is RBD cache setting must for ceph cluster to behave normally ? Thanks sumit On Mon, Feb 2, 2015 at 9:59 AM, Sumit Gaur wrote: >

Re: [ceph-users] ceph Performance random write is more then sequential

Hi Florent, Cache tiering , No . ** Our Architecture : vdbench/FIO inside VM <--> RBD without cache <-> Ceph Cluster (6 OSDs + 3 Mons) Thanks sumit [root@ceph-mon01 ~]# ceph -s cluster 47b3b559-f93c-4259-a6fb-97b00d87c55a health HEALTH_WARN clock skew detected on mon.ceph-mon02, mon.c

Re: [ceph-users] ceph Performance random write is more then sequential

Hi Sumit Do you have cache pool tiering activated ? Some feed-back regarding your architecture ? Thanks Sent from my iPad > On 1 févr. 2015, at 15:50, Sumit Gaur wrote: > > Hi > I have installed 6 node ceph cluster and to my surprise when I ran rados > bench I saw that random write has more

[ceph-users] ceph Performance random write is more then sequential

Hi I have installed 6 node ceph cluster and to my surprise when I ran rados bench I saw that random write has more performance number then sequential write. This is opposite to normal disk write. Can some body let me know if I am missing any ceph Architecture point here ? __