[Lustre-discuss] targets start order in Lustre 2.4.3
riccardo.murri at uzh.ch
Fri May 23 07:58:20 PDT 2014
The online Lustre manual recommends that Lustre targets are started in
this order: MGT, MDT, OSTs, clients.
Now we are setting up an HA cluster with Pacemaker, and a strict
ordering directive ("order ... Mandatory: ostXX mdt mgt") results in a
complete restart of all targets if the MGT is migrated. In my
experience (with Lustre 1.8.5) this is most of the time unnecessary,
and Lustre can recover from a single target restart. However, we have
recently switched to Lustre 2.4.3 and things might have changed.
So the question is: is this order strict (in Lustre 2.4.3), or can a
target be stopped and restarted on another node without affecting the
targets running on other nodes?
Thanks for any help!
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