On Sun, Apr 6, 2008 at 9:25 PM, Adrian Chadd <[EMAIL PROTECTED]> wrote:
> On Sun, Apr 06, 2008, Amos Shapira wrote: > > > I've been using DRBD for a few months now (just in stand-by mode, but > been > > following the forums and docs during that time) and all indications are > > that: > > > > 1. You CAN'T mount a non-cluster-aware file system even read-only on the > > secondary node since the primary will change FS-structs under the feet > of > > the read-only node and cause it to crash (because non-cluster-aware > > filesystems assume that they are the only ones who touch that > partition). > > > 2. You CAN mount read-write on multiple nodes if you use one of the > > cluster-aware filesystems (GFS and OCFS are regularly mentioned, but if > you > > find any other cluster-aware file system then it sounds like it will > work > > too). > > IIRC they assume a single back-end device. Does DRBD give you a journaling > block device which will stall updates until they've been pushed? How will > the FSes tolerate the device IO being possibly milliseconds later than the > master? Again - I haven't got around to actually use it (as much as I'd like to just sit down and try it) but you can see in the link that I sent with my previous reply that they clearly claim that it is supported. > Have you tried this suggestions? From all I read about DRBD this will > cause > > all secondary nodes to crash. > > I looked into it about a year ago and I couldn't find any simple way of Could it be that you looked at 0.7? I always used 0.8+ and got the impression that there were major improvements introduced in it over 0.7. doing this using free software. There's CODA/AFS as possible solutions but > they still push the notion of master/slave rather than equal peers, which > Chris mentions he needs (ie, constant synchronisation between each member > rather than periodic pushback..) That's what DRBD 0.8+GFS/OCFS is promoted as . Cheers, --Amos -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
