If you specify a db on ssd and data on hdd and not explicitly specify a device for wal, wal will be placed on same ssd partition with db. Placing only wal on ssd or creating separate devices for wal and db are less common setups.
/Maged On 22/10/18 09:03, Fyodor Ustinov wrote:
Hi! For sharing SSD between WAL and DB what should be placed on SSD? WAL or DB? ----- Original Message ----- From: "Maged Mokhtar" <mmokhtar@xxxxxxxxxxx> To: "ceph-users" <ceph-users@xxxxxxxxxxxxxx> Sent: Saturday, 20 October, 2018 20:05:44 Subject: Re: Drive for Wal and Db On 20/10/18 18:57, Robert Stanford wrote: Our OSDs are BlueStore and are on regular hard drives. Each OSD has a partition on an SSD for its DB. Wal is on the regular hard drives. Should I move the wal to share the SSD with the DB? Regards R _______________________________________________ ceph-users mailing list [ mailto:ceph-users@xxxxxxxxxxxxxx | ceph-users@xxxxxxxxxxxxxx ] [ http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com | http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com ] you should put wal on the faster device, wal and db could share the same ssd partition, Maged _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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