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Re: [Linux-cluster] GFS journals





Steve Maddison wrote:
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Hi all,

We're looking at setting up a cluster and using GFS to share data
between the individual nodes. Although our initial configuration would
probably consist of about 3 nodes, it's important that we can easily add
extra nodes in the future.

I've read that each node requires its own journal on the GFS filesystem
and that it's impossible to add journals without expanding the
filesystem.

small correction - to be able to add journals, you need unused space on the underlying LV or partition.

My query is therefore whether it's in any way detrimental to
specify a large number of journals (I'm thinking along the lines of 16
or 32 in our case) when creating the filesystem if these are unlikely to
ever be used? I realise each journal will incur a cost in terms of
storage space, but I'm willing to make the trade-off for the sake
scalability.


We created our GFS with 32 journals (during testing and in production) despite having only 6 nodes mounting it currently. We have not noticed any overhead w.r.t. mounting the GFS. I don't know what the journal size is, but we are not talking GB's per journal, AFAIK.

Riaan

Many thanks in advance for your responses.


Kind regards,

- --
Steve Maddison
System Administrator
Green Valley B.V.
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