Re: [ceph-users] block storage over provisioning
Thanks Wido. Appreciate quick response. On Wed, 30 Jan 2019 at 12:27, Wido den Hollander wrote: > > > On 1/30/19 9:12 PM, Void Star Nill wrote: > > Hello, > > > > When a Ceph block device is created with a given size, does Ceph > > allocate all that space right away or is that allocated as the user > > starts storing the data? > > > > I want to know if we can over provision the Ceph cluster. For example, > > if we have a cluster with 10G available space, am I allowed to create > > only 10, 1G volumes? Or can I over provision and assume that each > > volume is going to be used only up to 50% and allow creation of 20 1G > > volumes? > > > > Data is not allocated. You can overprovision with RBD as much as you like. > > You can provision 1PB of storage on a cluster with just 100TB of usable > capacity. Ceph/RBD won't prevent you from doing so. > > Wido > > > Thanks, > > Shridhar > > > > > > ___ > > ceph-users mailing list > > ceph-users@lists.ceph.com > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
Re: [ceph-users] block storage over provisioning
On 1/30/19 9:12 PM, Void Star Nill wrote: > Hello, > > When a Ceph block device is created with a given size, does Ceph > allocate all that space right away or is that allocated as the user > starts storing the data? > > I want to know if we can over provision the Ceph cluster. For example, > if we have a cluster with 10G available space, am I allowed to create > only 10, 1G volumes? Or can I over provision and assume that each > volume is going to be used only up to 50% and allow creation of 20 1G > volumes? > Data is not allocated. You can overprovision with RBD as much as you like. You can provision 1PB of storage on a cluster with just 100TB of usable capacity. Ceph/RBD won't prevent you from doing so. Wido > Thanks, > Shridhar > > > ___ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
[ceph-users] block storage over provisioning
Hello, When a Ceph block device is created with a given size, does Ceph allocate all that space right away or is that allocated as the user starts storing the data? I want to know if we can over provision the Ceph cluster. For example, if we have a cluster with 10G available space, am I allowed to create only 10, 1G volumes? Or can I over provision and assume that each volume is going to be used only up to 50% and allow creation of 20 1G volumes? Thanks, Shridhar ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
