topic Re: Shared LUN in Operating System - Linux

Shared LUN

Albert Malvehy — Wed, 27 Dec 2006 11:17:59 GMT

Hello,

I have a doubt about the hardware requirements: ¿is necessary a SAN to configure the system as load balancing of web services(this services are out of the cluster servers)?.

Thanks.

Re: Shared LUN

Steven E. Protter — Wed, 27 Dec 2006 14:20:28 GMT

Shalom,

The requirements are not that steep. Almost any SAN will do the job.

An HP EVA class disk array has a lot of flexibility, few single points of failure and two channels minimum path to each disk if its going to be an i/o intensive system.

If its not i/o intensive, nearly any SAN will do.

SEP

Re: Shared LUN

Serviceguard for Linux — Thu, 28 Dec 2006 02:19:20 GMT

If your Serviceguard cluster does not need shared storage, then you can use a LockLUN and no SAN.

I'm not sure about your question on load balancing. SGLX does failover of applications, including web services. It does not load balance incoming requests to multiple web services.

Re: Shared LUN

Serviceguard for Linux — Thu, 28 Dec 2006 02:20:44 GMT

If your Serviceguard cluster does not need shared storage, then you can use a LockLUN and no SAN. If there is state that needs to preserved after a failover, then you do need shared storage.

I'm not sure about your question on load balancing. SGLX does failover of applications, including web services. It does not load balance incoming requests to multiple web services.

Re: Shared LUN

Albert Malvehy — Thu, 28 Dec 2006 05:05:29 GMT

Thanks a lot about yours explanations.

Re: Shared LUN

Albert Malvehy — Thu, 28 Dec 2006 05:55:28 GMT

Â¿If I will mount a lock lun for my cluster, I need a external disk array?

Re: Shared LUN

Serviceguard for Linux — Thu, 28 Dec 2006 10:35:42 GMT

Yes - Lock Lun requires an external array. The MSA500G2 is proabably the lowest cost alternative.

Re: Shared LUN

Albert Malvehy — Thu, 28 Dec 2006 10:49:39 GMT

Thanks a lot