[Gluster-users] Distrbute AFR Storage

[Sean Davis]

2009/3/28 Simon Liang <simonl at bigair.net.au>

>  Well currently I've got 4 servers set up.
>         |- ServerA -AFR-> ServerB
> Client -|
>         |- ServerC -AFR-> ServerD
>
> I keep copying the same 1GB file to the storage, but it always writes to
> ServerC no matter what I do. Is there anything I can do to fix this? Add
> scheduler?
>

My understanding is that distribute uses a hash to do the distribution.  So,
if you copy the same file, you will get the same result every time; that is,
it will go to the same server every time.  Hashing is deterministic in that
sense.  Vikas or someone else may clarify if I have things wrong here....

Sean


>
>
>
> -----Original Message-----
> From: vikasgp at gmail.com on behalf of Vikas Gorur
> Sent: Sat 3/28/2009 3:53 PM
> To: Simon Liang
> Cc: gluster-users
> Subject: Re: [Gluster-users] Distrbute AFR Storage
>
> 2009/3/28 Simon Liang <simonl at bigair.net.au>:
> > How can I configure it so it writes it evenly to both servers, keeping
> the
> > free disk space even?
>
> Distribute by default will distribute _files_ evenly among its
> subvolumes. However, if one of the files is larger than the disk space
> available on the node it gets scheduled to, then distribute can do
> nothing. If you regularly want to store big files which might not fit
> on one of your subvolumes, you might want to try the 'stripe'
> translator.
>
> Vikas
> --
> Engineer - Z Research
> http://gluster.com/
>
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