Re: AdvFS & LSM friends or competitor

ghingres_at_yahoo.co.uk
Date: 03/16/05

  • Next message: Bob Harris: "Re: AdvFS & LSM friends or competitor" 
    Date: 16 Mar 2005 00:50:29 -0800

    Easiest way to think of things:-

    LSM is Software RAID. Normally you use RAID controllers etc which
    removes the need for LSM. But imagine you wished to mirror disks
    between a SAN in two different machine rooms... You would already be
    using a fibre hardware card to access the SAN so how would you
    mirror... answer LSM... (or pay mega bucks for some sort of SAN
    replication hardware). So in summary LSM will present a volume to Tru64
    which is software RAID'd behind the scenes.

    AdvFS is a file system. It allows you to take either physical disks or
    LSM volumes and create a domain. From the domain you can create
    filesets and mount those file sets into Tru64. The size of the domain
    can be increased/decreased by adding further physical disks /
    LSM-volumes to the domain. The AdvFS system is journaled so providing
    quick recovery on reboot. There are utilities available for AdvFS
    (example CloneSet) which provide further wizz-bang features. BUT ---
    AdvFS cannot mirror between its storage systems...

    Here we have two ES45's + RA8000's in separate machine rooms running
    Tru64 Clustered. The rooms are connected by Fibre, and LSM mirrors the
    disks on the RA8000 storage. AdvFS sits ontop of these volumes for both
    the OS and Data. We can destroy either machine room with no loss of
    data and possibly no loss of service... Thats where you can take it...

    Hope this makes sense

    Gary

  • Next message: Bob Harris: "Re: AdvFS & LSM friends or competitor"

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