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-bounces@xxxxxxxxxxxxxx] On Behalf Of > Sam Huracan > Sent: 02 December 2015 15:46 > To: ceph-users@xxxxxxxx > Subject: 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@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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