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

Xavier Trilla <xavier.trilla@xxxxxxxxxxx> · Fri, 3 Aug 2018 20:30:41 +0000

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.
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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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