Hello Rich,
I've seen your question on the ML, but I was hoping that after two more months, maybe we can get some feedback on this topic.
Regarding the WAL size, is there a way to specify the WAL and db partition size at the time of OSD preparation?
Kind regards,
Laszlo
On 09.03.2018 14:47, Richard Hesketh wrote:
I am also curious about this, in light of the reported performance regression switching from Filestore to Bluestore (when using SSDs for journalling/metadata db). I didn't get any responses when I asked, though. The major consideration that seems obvious is that this potentially hugely increases the required size for the WAL, but I'm not sure if that has any implications beyond simply needing a larger WAL/DB device or if there's other config changes that you'd need to do.
Rich
On 09/03/18 09:35, Budai Laszlo wrote:
Dear all,
I am wondering whether it helps to increase the bluestore_prefer_deferred_size to 4MB so the RBD chunks are first written to the WAL, and only later to the spinning disks.
Any opinions/experiences about this?
Kind regards,
Laszlo
On 08.03.2018 18:15, Budai Laszlo wrote:
Dear all,
I'm reading about the bluestore_prefer_deferred_size parameter for Bluestore. Are there any hints about its size when using a dedicated SSD for bock.wal and block.db ?
Thank you in advance!
Laszlo
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