[Beowulf] Lustre failover

Jan Heichler jan.heichler at gmx.net
Tue Sep 16 00:32:24 PDT 2008

Hallo Bernd,

Mittwoch, 10. September 2008, meintest Du:

BS> No, you can do active/active with several systems

BS>       Raid1
BS>      /     \
BS> OSS1        OSS2
BS>     \      /
BS>      Raid2

BS> (Raid1 and Raid2 are hardware raid systems).

BS> Now OSS1 will primarily serve Raid1 and OSS2 will primarily serve Raid2. So
BS> you have an active active situation. 

this is not what you would call "active/active" in a HA-environment. If Server1 is DHCP-Server and Server2 is NFS-Server and both can take over the other service you have an "active/passive" DHCP and "active/passive" NFS. 

Ofr Lustre you have "active/passive" for the data on RAID1 and "active/passive" for the data on RAID2. 

But i know that in the Lustre world this scenario is called "active/active" because no hardware is idle ;-)

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