[Gluster-users] Distrbute AFR Storage

[Simon Liang]

Is there a way to use a round-robin or something, as opposed to hash?

The problem with distribute is that it does not know the disk has run out of space, until it's starting copying and run out of space.
Can this be avoided?

-----Original Message-----
From: seandavi at gmail.com on behalf of Sean Davis
Sent: Sat 3/28/2009 9:51 PM
To: Simon Liang
Cc: Vikas Gorur; gluster-users
Subject: Re: [Gluster-users] Distrbute AFR Storage
 


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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