Re: [ceph-users] Sizing SSD's for ceph

2015-01-29 Thread Udo Lembke
Hi, Am 29.01.2015 07:53, schrieb Christian Balzer: > On Thu, 29 Jan 2015 01:30:41 + Ramakrishna Nishtala (rnishtal) wrote: >> * Per my understanding once writes are complete to journal then >> it is read again from the journal before writing to data disk. Does this >> mean, we have to

Re: [ceph-users] Sizing SSD's for ceph

2015-01-28 Thread Christian Balzer
On Thu, 29 Jan 2015 01:30:41 + Ramakrishna Nishtala (rnishtal) wrote: > Hi, > Apologize if something came up before like this. > Reading archives, it appears that 4 to 5 spinning disks are recommended > for single SSD. > It all depends on the SSDs and HDDs in question for one (how many HDDs c

[ceph-users] Sizing SSD's for ceph

2015-01-28 Thread Ramakrishna Nishtala (rnishtal)
Hi, Apologize if something came up before like this. Reading archives, it appears that 4 to 5 spinning disks are recommended for single SSD. I have two questions on the subject. * Some of the links suggest that we should use 'sync writes' to really size the journals. If true, then what