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*From*: "Caron, Chris" <caronc navcanada ca>*To*: <linux-cluster redhat com>*Subject*: [Linux-cluster] GFS & journal resources ... common ratio?*Date*: Tue, 7 Oct 2008 16:57:24 -0400

I just have a quick question regarding the amount of storage
occupied by the journals. Is there a common ratio to determine how much space
will be occupied? I’m doing very rough map and experimenting with
different conditions, but I can’t seem to get a common mechanism for
predicting the usable storage limit given the number of locks. Currently we have an 8 node cluster with 9 journals defined
(+1 just in case)… We are awaiting the external storage hardware;
but in the time being I am using exporting iscsi drives from another machine to
work with. With 9 locks and creating a 1.75GB partition, I get 655 MB
usable from it…. (roughly calculated ratio: 3.37) With 9 locks and creating a 1.50GB partition, I get 393 MB
usable from it…. (roughly calculated ratio: 2.36) With 9 locks and creating a 1.25GB partition, I get 131 MB
usable from it…. (roughly calculated ratio: 0.90) I’m obviously missing a figure during my calculations
because the ratios vary each time… I’d have expected them to be a
bit more constant… At the end of the day I want to be able to know ahead of
time how much hard-disk space I need to allocate for ‘X usable’ based
on the number of locks I’m using. The simple equation I used was: X/9=USABLE/ALLOCATED ie: (X/9=.655/1.75 = 3.369) Chris |

**Follow-Ups**:**Re: [Linux-cluster] GFS & journal resources ... common ratio?***From:*Kevin Anderson