Hi Christian and Wido, I used the daily digest and lost way to reply without heavy editing the replies. I will change my subscription to be individual message later.
How big is the disk? RocksDB will need to compact at some point and it > seems that the HDD can't keep up. > I've seen this with many customers and in those cases we offloaded the > WAL+DB to an SSD. > How big is the data drive and the DB? > Wido The disks are 6TB each. The data drive is around 50% of the disk and the DB varies from 40 to 67GB. Splitting the WAL+DB to SSD is not an option at this time because rebuilding the OSD one by one will take forever. It's ceph-bluestore-tool. Is there any official documentation on how to online migrate the WAL+DB to SSD? I guess this feature is not backported to Luminous right? Kind regards, Charles Alva Sent from Gmail Mobile On Fri, Apr 12, 2019 at 10:24 AM Christian Balzer <ch...@gol.com> wrote: > > Hello Charles, > > On Wed, 10 Apr 2019 14:07:58 +0700 Charles Alva wrote: > > > Hi Ceph Users, > > > > Is there a way around to minimize rocksdb compacting event so that it > won't > > use all the spinning disk IO utilization and avoid it being marked as > down > > due to fail to send heartbeat to others? > > > > Right now we have frequent high IO disk utilization for every 20-25 > minutes > > where the rocksdb reaches level 4 with 67GB data to compact. > > > > > Could you please follow up on the questions Wido asked? > > As in sizes of disk, DB, number and size of objects (I think you're using > object store), how busy those disks and CPUs are, etc. > > That kind of information will be invaluable for others here and likely the > developers as well. > > Regards, > > Christian > > > Kind regards, > > > > Charles Alva > > Sent from Gmail Mobile > > > -- > Christian Balzer Network/Systems Engineer > ch...@gol.com Rakuten Communications >
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