[ClusterLabs] Antw: VG activation on Active/Passive
Ulrich.Windl at rz.uni-regensburg.de
Mon Aug 31 02:41:36 EDT 2015
>>> Jorge Fábregas <jorge at fabregas.pro> schrieb am 29.08.2015 um 20:27 in
<55E1F99A.3050000 at fabregas.pro>:
> For an active/passive cluster, using a non-cluster filesystem like ext3
> over LVM (using cLVM & DLM), would you:
Actually when using ext3 I wouldn't use cLVM, so this variant wouldn't exist
I see the danger that someone might mount the ext3-LV in a second node by
mistake. Sometimes this will corrupt the filesystem in a way that fsck cannot
repair, and maybe you'll discover that days after it happened...
> - include the VG activation in the same cloned group that hosts cLVM &
> DLM? (top of screenshot) so that in both nodes the VG is activated (even
> though this is not a cluster-filesystem so there's no need to have the
> VG activated on both sides simultaneously)?
> - do you create a separate group with the VG activation (LVM resource)
> and tie it with the Filesystem resource? (bottom of screenshot). This
> makes more sense to me since the VG only needs to be activated where the
> filesystem is going to be mounted.
> Here's my screenshot:
> I belive this last one is THE way to go for such setup (active/passive)
> but I'm wondering why I have seen examples online with the first case.
> Maybe I'm missing something.
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