>>> Eric Robinson <eric.robin...@psmnv.com> schrieb am 29.10.2019 um 23:17 in Nachricht <mn2pr03mb4845e1fbc259a2b29176fc33fa...@mn2pr03mb4845.namprd03.prod.outlook.com>
> If I have an LV as a backing device for a DRBD disk, can someone explain why > I need an LVM filter? It seems to me that we would want the LV to be always > active under both the primary and secondary DRBD devices, and there should be > no need or desire to have the LV activated or deactivated by Pacemaker. What > am I missing? At least in the past it also had a performance reason: Most LVM tools did not cache device information, and instead did O_DIRECT device access. In a SAN environment with more than 100 disk paths, plus device-mapper devices, partitions, etc. The delay and I/O impact was significant. So if you are using LVM only on a few devices, help LVM to locate those. Also for multipath you want LVM to use the multipath device instead of a single path device for example. Regards, Ulrich > > ‑‑Eric > > > > > Disclaimer : This email and any files transmitted with it are confidential > and intended solely for intended recipients. If you are not the named > addressee you should not disseminate, distribute, copy or alter this email. > Any views or opinions presented in this email are solely those of the author > and might not represent those of Physician Select Management. Warning: > Although Physician Select Management has taken reasonable precautions to > ensure no viruses are present in this email, the company cannot accept > responsibility for any loss or damage arising from the use of this email or > attachments. _______________________________________________ Manage your subscription: https://lists.clusterlabs.org/mailman/listinfo/users ClusterLabs home: https://www.clusterlabs.org/
