Hi, On Tue, Jan 27, 2009 at 5:01 PM, Sean Davis <[email protected]> wrote:
> > > On Tue, Jan 27, 2009 at 1:23 AM, Raghavendra G > <[email protected]>wrote: > >> Hi, >> >> On Tue, Jan 27, 2009 at 3:27 AM, Sean Davis <[email protected]> wrote: >> >>> If I am putting together several volumes of varying sizes using >>> distribute, what type of load balancing should I expect? I understand >>> hashing and it sounds like if the disk fills, then it is not used, but can I >>> use ALU scheduler to cut things off before the disk becomes full to allow >>> for growth of directories and files? How are people approaching this? >> >> >> Distribute, does not have any schedulers. The hashing as of now is sort >> of static in the sense that if the disk becomes full, further creation of >> files which happen to be scheduled to that node fail. Future versions of >> distribute will reschedule the files to different nodes. >> >> > > Thanks, Raghavendra. > > So, it sounds like Distribute is problematic for any inhomogeneous file > system (where bricks are of different sizes) or for systems that are not > meant as "archival" (that is, write once, read many). I understand that for > boatloads of small files, performance is improved over unify by using > distribute, but it sounds like unify is currently the better option for my > situation. > > Is it worthwhile pointing out these details on the wiki somewhere? The > website appears to suggest that unify/schedulers are "legacy" systems, which > implies that they are inferior to rather than an alternative to Distribute. > However, in my situation, it appears that Unify is the only viable solution. > Its mentioned under "legacy" section in the sense that, it will be gradually phased out as Distribute evolves. > > > Thanks for the help. > > Sean > > > -- Raghavendra G
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