Re: any best practice for number of new GFS journal to add?

[Ian Hayes <cthulhucalling@xxxxxxxxx>]

The number of journals you have is dependant on the number of cluster members using that GFS filesystem, not the size of it. As I understand it, you may have to tweak the size of the journals if you're doing a lot of I/O. At a minimum, you're going to need N journals, where N is the number of cluster members using the GFS volume. I generally create N+1 journals in case I need to add a host quickly and I might forget to add a journal otherwise.

On Tue, Dec 29, 2009 at 12:59 AM, Diamond Li <diamondiona@xxxxxxxxx> wrote:

hello everyone,

I feel a little bit confused about gfs_jadd. my understanding is we do
not have to add new journal after we extend file system size because
current size may be enough,  is it true ?

is there any best pratice for when should we add new journal, the
right number of new added journal, and journal size? for instance, if
my file system grows from 2G to 4G, what would be the right answer for
my questions, and it grows from 2T to 4T, etc.

best regards!

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