Re: [ceph-users] Bluestore on HDD+SSD sync write latency experiences

2018-05-03 Thread Nick Fisk
Hi Dan, Quoting Dan van der Ster : Hi Nick, Our latency probe results (4kB rados bench) didn't change noticeably after converting a test cluster from FileStore (sata SSD journal) to BlueStore (sata SSD db). Those 4kB writes take 3-4ms on average from a random VM in our data centre. (So bluest

Re: [ceph-users] Bluestore on HDD+SSD sync write latency experiences

2018-05-03 Thread Dan van der Ster
Hi Nick, Our latency probe results (4kB rados bench) didn't change noticeably after converting a test cluster from FileStore (sata SSD journal) to BlueStore (sata SSD db). Those 4kB writes take 3-4ms on average from a random VM in our data centre. (So bluestore DB seems equivalent to FileStore jou

Re: [ceph-users] Bluestore on HDD+SSD sync write latency experiences

2018-05-03 Thread Alex Gorbachev
On Thu, May 3, 2018 at 6:54 AM, Nick Fisk wrote: > -Original Message- > From: Alex Gorbachev > Sent: 02 May 2018 22:05 > To: Nick Fisk > Cc: ceph-users > Subject: Re: [ceph-users] Bluestore on HDD+SSD sync write latency experiences > > Hi Nick, > > On Tue

Re: [ceph-users] Bluestore on HDD+SSD sync write latency experiences

2018-05-03 Thread Nick Fisk
Hi Nick, On 5/1/2018 11:50 PM, Nick Fisk wrote: Hi all, Slowly getting round to migrating clusters to Bluestore but I am interested in how people are handling the potential change in write latency coming from Filestore? Or maybe nobody is really seeing much difference? As we all know, in

Re: [ceph-users] Bluestore on HDD+SSD sync write latency experiences

2018-05-03 Thread Nick Fisk
-Original Message- From: Alex Gorbachev Sent: 02 May 2018 22:05 To: Nick Fisk Cc: ceph-users Subject: Re: [ceph-users] Bluestore on HDD+SSD sync write latency experiences Hi Nick, On Tue, May 1, 2018 at 4:50 PM, Nick Fisk wrote: > Hi all, > > > > Slowly getting rou

Re: [ceph-users] Bluestore on HDD+SSD sync write latency experiences

2018-05-02 Thread Alex Gorbachev
Hi Nick, On Tue, May 1, 2018 at 4:50 PM, Nick Fisk wrote: > Hi all, > > > > Slowly getting round to migrating clusters to Bluestore but I am interested > in how people are handling the potential change in write latency coming from > Filestore? Or maybe nobody is really seeing much difference? > >

Re: [ceph-users] Bluestore on HDD+SSD sync write latency experiences

2018-05-02 Thread Igor Fedotov
Hi Nick, On 5/1/2018 11:50 PM, Nick Fisk wrote: Hi all, Slowly getting round to migrating clusters to Bluestore but I am interested in how people are handling the potential change in write latency coming from Filestore? Or maybe nobody is really seeing much difference? As we all know, in