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

Nikola Savic niks at logik-internet.rs
Tue Feb 15 02:53:33 UTC 2011

Digimer wrote:
> First, it will rejoin the other DRBD members. These members will have a
> "dirty block" list in memory which will allow them to quickly bring the
> recovered server back into sync. During this time, you can bring that
> node online (ie: set it primary and start accessing it via GFS2).
> However, note that it can not be the sole primary device until it is
> fully sync'ed.

  If I understand you well, even before sync is completely done DRBD
will take care of reading and writing of dirty blocks on problematic
node that got back online? Let's say that node was down for longer time
and that synchronization can take few minutes, maybe more. If all
services start working before sync is complete, it can happen that web
applications tries to write into or read from dirty block(s). Will DRBD
take care of that? If not, is there way to suspend startup of services
(web server and similar) until sync is done?

  Thanks for detailed replies!


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