e same SSD?
Mensaje original
De: Nick Fisk <n...@fisk.me.uk>
Fecha: 8/11/17 10:16 p. m. (GMT+01:00)
Para: 'Mark Nelson' <mnel...@redhat.com>, 'Wolfgang Lendl'
<wolfgang.le...@meduniwien.ac.at>
Cc: ceph-users@lists.ceph.com
Asunto: Re: [ceph-users] bluestore - wal,db on fas
g Lendl'
<wolfgang.le...@meduniwien.ac.at>
Cc: ceph-users@lists.ceph.com
Asunto: Re: [ceph-users] bluestore - wal,db on faster devices?
-Original Message-
From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of
Mark Nelson
Sent: 08 November 2017 19:46
To: Wolfgang Lendl <
ember 2017 19:46
>> To: Wolfgang Lendl <wolfgang.le...@meduniwien.ac.at>
>> Cc: ceph-users@lists.ceph.com
>> Subject: Re: [ceph-users] bluestore - wal,db on faster devices?
>>
>> Hi Wolfgang,
>>
>> You've got the right idea. RBD is probably going t
ng Lendl' <wolfgang.le...@meduniwien.ac.at> Cc:
ceph-users@lists.ceph.com Asunto: Re: [ceph-users] bluestore - wal,db on faster
devices?
> -Original Message-
> From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of
> Mark Nelson
> Sent: 08 November 2017
> -Original Message-
> From: Mark Nelson [mailto:mnel...@redhat.com]
> Sent: 08 November 2017 21:42
> To: n...@fisk.me.uk; 'Wolfgang Lendl' <wolfgang.le...@meduniwien.ac.at>
> Cc: ceph-users@lists.ceph.com
> Subject: Re: [ceph-users] bluestore - wal,db on faster d
-users] bluestore - wal,db on faster devices?
Hi Wolfgang,
You've got the right idea. RBD is probably going to benefit less since
you
have a small number of large objects and little extra OMAP data.
Having the allocation and object metadata on flash certainly shouldn't
hurt,
and you should stil
> -Original Message-
> From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of
> Mark Nelson
> Sent: 08 November 2017 19:46
> To: Wolfgang Lendl <wolfgang.le...@meduniwien.ac.at>
> Cc: ceph-users@lists.ceph.com
> Subject: Re: [ceph-users] b
Hi Wolfgang,
You've got the right idea. RBD is probably going to benefit less since
you have a small number of large objects and little extra OMAP data.
Having the allocation and object metadata on flash certainly shouldn't
hurt, and you should still have less overhead for small (<64k)
Hi Mark,
thanks for your reply!
I'm a big fan of keeping things simple - this means that there has to be
a very good reason to put the WAL and DB on a separate device otherwise
I'll keep it collocated (and simpler).
as far as I understood - putting the WAL,DB on a faster (than hdd)
device makes
Hi Wolfgang,
In bluestore the WAL serves sort of a similar purpose to filestore's
journal, but bluestore isn't dependent on it for guaranteeing durability
of large writes. With bluestore you can often get higher large-write
throughput than with filestore when using HDD-only or flash-only
Hello,
it's clear to me getting a performance gain from putting the journal on
a fast device (ssd,nvme) when using filestore backend.
it's not when it comes to bluestore - are there any resources,
performance test, etc. out there how a fast wal,db device impacts
performance?
br
wolfgang
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