[gpfsug-discuss] restripe or not

[Stijn De Weirdt]

hi all,

we are going to expand an existing filestytem with approx 50% capacity. 
the current filesystem is 75% full.

we are in downtime (for more then just this reason), so we can take the 
IO rebalance hit for a while (say max 48hours).

my questions:
a. do we really need to rebalance? the mmadddisk page suggest normally 
it's going to be ok, but i never understood that. new data will end up 
mainly on new disks, so wrt to performance, this can't really work out, 
can it?
b. can we change the priority of rebalancing somehow (fewer nodes taking 
part in the rebalance?)
c. once we start the rebalance, how save is it to stop with kill or 
ctrl-c (or can we say eg. rebalance 25% now, rest later?)
(and how often can we do this? eg a daily cron job to restripe at max 
one hour per day, would this cause issue in the long term


many thanks,

stijn