Hi Vladimir, If you're using the default options for rocksdb, then the size of L3 will be 25GB. Since your block-db is only 20GB and L3 can only be filled if the entire level's size is available, bluefs will begin spillover. Like Igor said, having 30GB+ is recommended if you want to host up to 3 levels of rocksdb in the SSD.
Thanks, Orlando -----Original Message----- From: Igor Fedotov <ifedo...@suse.de> Sent: Wednesday, February 5, 2020 7:04 AM To: Vladimir Prokofev <v...@prokofev.me>; ceph-users@ceph.io Subject: [ceph-users] Re: Fwd: BlueFS spillover yet again Hi Vladimir, there were a plenty of discussions/recommendations around db volume size selection here. In short it's advised to have DB volume of 30 - 64GB for most of use cases. Thanks, Igor On 2/5/2020 4:21 PM, Vladimir Prokofev wrote: > Cluster upgraded from 12.2.12 to 14.2.5. All went smooth, except > BlueFS spillover warning. > We create OSDs with ceph-deploy, command goes like this: > ceph-deploy osd create --bluestore --data /dev/sdf --block-db > /dev/sdb5 --block-wal /dev/sdb6 ceph-osd3 where block-db and block-wal > are SSD partitions. > Default ceph-deploy settings created partitions ~1GB which is, of > course, too small. So we redeployed OSDs using manually partitioned > SSD for block-db/block-wal with sizes of 20G/5G respectively. > But now we still get BlueFS spillover warning for redeployed OSDs: > osd.10 spilled over 2.4 GiB metadata from 'db' device (2.8 GiB > used of > 19 GiB) to slow device > osd.19 spilled over 3.7 GiB metadata from 'db' device (2.7 GiB > used of > 19 GiB) to slow device > osd.20 spilled over 4.2 GiB metadata from 'db' device (2.6 GiB > used of > 19 GiB) to slow device > osd size is 1.8 TiB. > > These OSDs are used primarily for RBD as a backup drives, so a lot of > snapshots held there. They also have RGW pool assigned to them, but it > has no data. > I know of sizing recommendations[1] for block-db/block-wal, but I > assumed since it's primarily RBD 1%(~20G) should be enough. > Also, compaction stats doesn't make sense to me[2]. It states that sum > of DB is only 5.08GB, that should be placed on block-db without a problem? > Am I understanding all this wrong? Should block-db size be greater in > my case? > > [1] > https://docs.ceph.com/docs/master/rados/configuration/bluestore-config > -ref/#sizing > [2] osd.10 logs as an example > https://pastebin.com/hC6w6jSn > _______________________________________________ > ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an > email to ceph-users-le...@ceph.io _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
