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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