2011/1/29 Alexander Schreiber <als@xxxxxxxxxxxxxxx>: > On Sat, Jan 29, 2011 at 12:23:14PM -0200, Denis wrote: >> 2011/1/29 Alexander Schreiber <als@xxxxxxxxxxxxxxx> >> >> > >> > plain disk performance for writes, while reads should be reasonably >> > close to the plain disk performance - drbd optimizes reads by just reading >> > from the local disk if it can. >> > >> > >> However, I have not used it with active-active fashion. Have you? if yes, >> what is your overall experience? > > We are using drbd to provide mirrored disks for virtual machines running > under Xen. 99% of the time, the drbd devices run in primary/secondary > mode (aka active/passive), but they are switched to primary/primary > (aka active/active) for live migrations of domains, as that needs the > disks to be available on both nodes. From our experience, if the drbd > device is healthy, this is very reliable. No experience with running > drbd in primary/primary config for any extended period of time, though > (the live migrations are usually over after a few seconds to a minute at > most, then the drbd devices go back to primary/secondary). What filesystem are you using to enable the primary-primary mode? Have you evaluated it against any other available option? > > Kind regards, > Alex. > -- > "Opportunity is missed by most people because it is dressed in overalls and > looks like work." -- Thomas A. Edison > cheers! -- Denis Anjos, www.versatushpc.com.br -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
