It'll cause problems if yours the only one NVMe drive will die - you'll lost all the DB partitions and all the OSDs are going to be failed ------------------------- Stas -----Original Message----- From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Vladimir Brik Sent: Friday, December 21, 2018 12:09 AM To: ceph-users@xxxxxxxxxxxxxx Subject: Bluestore nvme DB/WAL size [External Email] ________________________________ Hello I am considering using logical volumes of an NVMe drive as DB or WAL devices for OSDs on spinning disks. The documentation recommends against DB devices smaller than 4% of slow disk size. Our servers have 16x 10TB HDDs and a single 1.5TB NVMe, so dividing it equally will result in each OSD getting ~90GB DB NVMe volume, which is a lot less than 4%. Will this cause problems down the road? Thanks Vlad _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com ________________________________ The information transmitted herein is intended only for the person or entity to which it is addressed and may contain confidential, proprietary and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer. _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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