Hello Frank, Thanks for the feedback! > Ceph doesn't, but LVM does. This is one of the reasons for moving to LVM, to allow transparent use of multi-path devices via LVM instead of replicating native support in ceph. Now, the remaining question is, how to tell ceph-adm to use only the multipath devices created by the multipath service, if you want to use ceph-adm (I don't). I don't remember where they show up, is it /dev/multipath or something? > For a shared storage we use multipathd (multipath daemon) and configure two raw devices for example /dev/sda (this is the block device 1 visible via Path A) and dev/sdb (this is the block device 1 visible via Path B) into a multipath device with name for example diskmpath1. When we make the multipath configuration will appear device '/dev/mapper/diskmpath1', and on top of this '/dev/mapper/diskmpath1' we create physical volume for example. [root@comp1 ~]# pvcreate /dev/mapper/diskmpath1 Physical volume "/dev/mapper/diskmpath1" successfully created So I'm to find out if this multipath is also correct to be used for Ceph deployment. Once I figure out how to proceed with multipath devices my plan is to install Ceph using official install method: - Cephadm installs and manages a Ceph cluster using containers and systemd, with tight integration with the CLI and dashboard GUI. Regards, Kosta On Monday, 23 May 2022 12:31:15 pm (+03:00), Frank Schilder wrote: > > > My question is shall I configure multipath from RHEL 8.6 OS in advance (for > > > example sda+sdbb=md0) or I should leave cephadm to handle the multipath by > > > itself? > > > > I don’t think Ceph has any concept of multipathing. Since Ceph keeps multiple copies of data, it’s usually overkill. > > Ceph doesn't, but LVM does. This is one of the reasons for moving to LVM, to allow transparent use of multi-path devices via LVM instead of replicating native support in ceph. Now, the remaining question is, how to tell ceph-adm to use only the multipath devices created by the multipath service, if you want to use ceph-adm (I don't). I don't remember where they show up, is it /dev/multipath or something? > > Best regards, > ================= > Frank Schilder > AIT Risø Campus > Bygning 109, rum S14 > _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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