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Re: [Linux-cluster] Cluster with shared storage on low budget



Thomas Sjolshagen wrote:

Just so you realize; If you intend to use clvm (i.e. lvme in a cluster where you expect to be able to write to the volume from more than one node at/around the same time w/o a full-on failover), you will _not_ have snapshot support. And no, this isn't "not supported" as in "nobody to call if you encounter a problem", it's "not supported" as in "the tools will not let you create a snapshot of the LV".

i've been listening to this discussion with much interest, as we would like to improve the currency of our backup files.

right now we have an ensemble of GFS2 LV's ("pri") as our primary data store, and a "matching ensemble" of XFS LV's ("bak") as our backup data store. an hourly cron job rsync's all LV's in the ensemble from pri => bak. it's incredibly reliable, but this reduces our mean backup currency by 1/2 hour. one upside is that i've got snapshots that are only 1/2 hour old, and are daily backed up to tape.

the conversation seems to indicate that we can change the bak LV's from XFS to GFS2 and have drbd auto-sync the pri LV changes made to the bak LV's - yes? this would reduce our backup currency from a mean of 1/2 hour to theoretically, "atomic" (more likely "mere seconds"). i assUme we have to change from XFS to GFS2, as drbd doesn't appear to do file system conversions...

if our assumptions are correct, are there any guides / manuals / doc on how to do this? it's most tempting to try, since if it doesn't work, the hourly cron rsync's could be simply reinstated.

many thanks in advance to any and all who can advise...

yvette


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