Re: FileStore SSD (journal) vs BlueStore SSD (DB/Wal)

[Xavier Trilla <xavier.trilla@xxxxxxxxxxx>]

Hi Sam,

 

I’m not 100% sure, but I think filestore will be removed in future ceph releases, so you’ll have to upgrade at some point (Also, there are other benefits you’ll get once you upgrade to bluestore).

 

Check different SSD caching systems included in Linux, that could be a good solution for you.

 

Cheers!

 

P.S.: “Saludos” means cheers in Spanish XD… my name is Xavier

 

Xavier Trilla P.

Clouding.io

 

¿Un Servidor Cloud con SSDs, redundado

y disponible en menos de 30 segundos?

 

¡Pruébalo ahora en Clouding.io!

 

De: ceph-users <ceph-users-bounces@xxxxxxxxxxxxxx> En nombre de Sam Huracan
Enviado el: domingo, 5 de agosto de 2018 17:08
Para: ceph-users@xxxxxxxxxxxxxx
Asunto: Re: [ceph-users] FileStore SSD (journal) vs BlueStore SSD (DB/Wal)

 

Hi,

 

Anyone who has real experiences on this case, could you give me more information and estimation?

 

Thanks.

 

2018-08-05 15:00 GMT+07:00 Sam Huracan <nowitzki.sammy@xxxxxxxxx>:

Thanks Saludos!

 

As far as I know, we should keep the FileStore SSD Journal after upgrading, because BlueStore will affect the write performance??

I think I'll choose Luminous which is recently the most stable version.

 

 

 

 

 

 

 

On Sat, Aug 4, 2018, 03:31 Xavier Trilla <xavier.trilla@xxxxxxxxxxx> wrote:

Hi Sam,

 

Having done any benchmark myself -as we only use SSDs or NVMes- but is my understanding Luminous -I would not recommend upgrading production to Mimic yet, but I’m quite conservative- Bluestore is going to be slower for writes than filestore with SSD journals.

 

You could try dmcache, bcache, etc and add some SSD caching to each HDD  (Meaning it can affect write endurance of the SSDs).

 

Dmcache and bluestore seems to be a quite interesting option IMO, as you’ll get faster reads and writes, and you’ll avoid the double write penalty of filestore.

 

Cheers!

 

Saludos Cordiales,

Xavier Trilla P.

Clouding.io

 

¿Un Servidor Cloud con SSDs, redundado

y disponible en menos de 30 segundos?

 

¡Pruébalo ahora en Clouding.io!

 

De: ceph-users <ceph-users-bounces@xxxxxxxxxxxxxx> En nombre de Sam Huracan
Enviado el: viernes, 3 de agosto de 2018 16:36
Para: ceph-users@xxxxxxxxxxxxxx
Asunto: Re: [ceph-users] FileStore SSD (journal) vs BlueStore SSD (DB/Wal)

 

Hi,

 

Anyone can help us answer these questions?

 

 

 

2018-08-03 8:36 GMT+07:00 Sam Huracan <nowitzki.sammy@xxxxxxxxx>:

Hi Cephers,

 

We intend to upgrade our Cluster from Jewel to Luminous (or Mimic?)

 

Our model is currently using OSD File Store with SSD Journal (1 SSD for 7 SATA 7.2K)

 

My question are:

 

 

1.Should we change to BlueStore with DB/WAL put in SSD and data in HDD? (we want to keep the model using journal SSD for caching). Is there any improvement in overall performance? We think with model SSD cache, FileStore will write faster because data written in SSD before flushing to SAS, whereas with BlueStore, data will be written directly to SAS.

 

 

2. Do you guys ever benchmark and compare 2 cluster: FileStore SSD (journal)  and BlueStore SSD (DB/WAL) like that? 

 

 

Thanks in advance.

 

 

 

 

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