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

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

2018-05-01 Thread Nick Fisk
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 Bluestore, writes are not double written and in mo