I'm following this presentation of Mirantis team: http://www.slideshare.net/mirantis/ceph-talk-vancouver-20
They calculate CEPH IOPS = Disk IOPS * HDD Quantity * 0.88 (4-8k random read proportion) And VM IOPS = CEPH IOPS / VM Quantity But if I use replication of 3, *Would VM IOPS be divided by 3? * 2015-12-03 7:09 GMT+07:00 Sam Huracan <nowitzki.sa...@gmail.com>: > IO size is 4 KB, and I need a Minimum sizing, cost optimized > I intend use SuperMicro Devices > http://www.supermicro.com/solutions/storage_Ceph.cfm > > What do you think? > > 2015-12-02 23:17 GMT+07:00 Srinivasula Maram < > srinivasula.ma...@sandisk.com>: > >> One more factor we need to consider here is IO size(block size) to get >> required IOPS, based on this we can calculate the bandwidth and design the >> solution. >> >> Thanks >> Srinivas >> >> -----Original Message----- >> From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of >> Nick Fisk >> Sent: Wednesday, December 02, 2015 9:28 PM >> To: 'Sam Huracan'; ceph-us...@ceph.com >> Subject: Re: [ceph-users] Ceph Sizing >> >> You've left out an important factor....cost. Otherwise I would just say >> buy enough SSD to cover the capacity. >> >> > -----Original Message----- >> > From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf >> > Of Sam Huracan >> > Sent: 02 December 2015 15:46 >> > To: ceph-us...@ceph.com >> > Subject: [ceph-users] Ceph Sizing >> > >> > Hi, >> > I'm building a storage structure for OpenStack cloud System, input: >> > - 700 VM >> > - 150 IOPS per VM >> > - 20 Storage per VM (boot volume) >> > - Some VM run database (SQL or MySQL) >> > >> > I want to ask a sizing plan for Ceph to satisfy the IOPS requirement, >> > I list some factors considered: >> > - Amount of OSD (SAS Disk) >> > - Amount of Journal (SSD) >> > - Amount of OSD Servers >> > - Amount of MON Server >> > - Network >> > - Replica ( default is 3) >> > >> > I will divide to 3 pool with 3 Disk types: SSD, SAS 15k and SAS 10k >> > Should I use all 3 disk types in one server or build dedicated servers >> > for every pool? Example: 3 15k servers for Pool-1, 3 10k Servers for >> Pool-2. >> > >> > Could you help me a formula to calculate the minimum devices needed >> > for above input. >> > >> > Thanks and regards. >> >> >> >> >> >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > >
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