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2 SSA boxes for SSA boxes physical redundancy - AIX

Dears, I want some quick help from you all guys as customer now want me to respond as soon as possible......and i think preobably no one in RISC world has think forever for redundancy over ssa boxes...that's why i did not get any response. SASA [email]sasa1973pk[/email] (sasa queer) wrote in message news:<702930ee.0307030358.2da58c86posting.google. com>... > Dears, > I have a customer who is so much curious about redundancy matter that > he thinks > that a shared SSA between two RISC nodes is a single point of failure( > inspite of having two hot spare disks). > Now he wants to ...

  1. #1

    Default Re: 2 SSA boxes for SSA boxes physical redundancy

    Dears,
    I want some quick help from you all guys as customer now want me to
    respond as soon as possible......and i think preobably no one in RISC
    world has think forever for redundancy over ssa boxes...that's why i
    did not get any response.

    SASA

    [email]sasa1973pk[/email] (sasa queer) wrote in message news:<702930ee.0307030358.2da58c86posting.google. com>...
    > Dears,
    > I have a customer who is so much curious about redundancy matter that
    > he thinks
    > that a shared SSA between two RISC nodes is a single point of failure(
    > inspite of having two hot spare disks).
    > Now he wants to place another SSA box with same number of disks in the
    > same ssa loop with existing SSA box.However he is afraid of
    > performance issues!!!!!
    > what i suggest that implement two raid5 on two controllers and then do
    > mirroring on O/S level.
    > Can anybody help me in predicting performance issues if there!!!!
    > if yes then what will be other alternatives ???????please guide !!!
    >
    > SASA
    sasa queer Guest

  2. #2

    Default Re: 2 SSA boxes for SSA boxes physical redundancy

    Hello,

    Can your SSA adapters do RAID10 ? If yes, you could think about it.
    RAID10 should give you reasonably good performance (RAID0) and proteccion (RAID1)

    Cheers

    Javier Espinosa


    [email]j_ammann[/email] (Joerg Ammann) wrote in message news:<a5fbda48.0307082225.7ba8187bposting.google. com>...
    > [email]sasa1973pk[/email] (sasa queer) wrote in message news:<702930ee.0307080034.4e3d8d3posting.google.c om>...
    > > Dears,
    > > I want some quick help from you all guys as customer now want me to
    > > respond as soon as possible......and i think preobably no one in RISC
    > > world has think forever for redundancy over ssa boxes...that's why i
    > > did not get any response.
    > >
    > > SASA
    > >
    > > [email]sasa1973pk[/email] (sasa queer) wrote in message news:<702930ee.0307030358.2da58c86posting.google. com>...
    > > > Dears,
    > > > I have a customer who is so much curious about redundancy matter that
    > > > he thinks
    > > > that a shared SSA between two RISC nodes is a single point of failure(
    > > > inspite of having two hot spare disks).
    > > > Now he wants to place another SSA box with same number of disks in the
    > > > same ssa loop with existing SSA box.However he is afraid of
    > > > performance issues!!!!!
    > > > what i suggest that implement two raid5 on two controllers and then do
    > > > mirroring on O/S level.
    > > > Can anybody help me in predicting performance issues if there!!!!
    > > > if yes then what will be other alternatives ???????please guide !!!
    > > >
    > > > SASA
    >
    > our setup is:
    > - 2 pserver, each with 2 ssa-adapters
    > - 2 ssa-box
    >
    > the loops are:
    > server1/ssa-adapter1 --- ssa-box1 --- server2/ssa-adapter1 ---
    > back-to server1
    >
    > server1/ssa-adapter2 --- ssa-box2 --- server2/ssa-adapter2 ---
    > back-to server1
    >
    > the logical-volumes are mirrorred from ssa-box1 to box2
    >
    > this gives us redundancy for:
    > - failure of ssa-disk or whole ssa-box
    > - failure of ssa-adapter
    > - and (with some manual work, as this is only a poor mans HACAMP) for
    > failure of server
    >
    > theres some more work for the os io-subsytem, because of the
    > write-doubling, but we never encountered a performance problem.
    >
    > joerg
    Javier Espinosa Guest

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