in other words... the write speed is limited by the fastest disk (one or more disks how many sync/async writes should we allow is another problem, not for now), not the slowest the cache is another limit (when cache get full, async writes should wait) 2011/3/3 Roberto Spadim <roberto@xxxxxxxxxxxxx>: > ops... ndb mysql cluster > > it´s like to get more speed on small (cache time/size) writes > may be dirty, but if only X disks are in sync array could continue > running with async writes without problems > > > 2011/3/3 Roberto Spadim <roberto@xxxxxxxxxxxxx>: >> if others fail, fail the disks =), it´s something like nbd (mysql) cluster >> two disks ok, return ok others works like async write >> on error, resync nodes/mirrors >> i don´t know the name but they call somethink like isosyncronous or >> semisyncronous, i don´t remember now >> >> 2011/3/3 Mathias Burén <mathias.buren@xxxxxxxxx>: >>> And if md sends ok when first write is complete, then other writes fail? >>> >>> On 3 Mar 2011 22:45, "Roberto Spadim" <roberto@xxxxxxxxxxxxx> wrote: >>>> hi guys, i have some questions... >>>> how write works in raid1? >>>> md send write to all mirrors and wait write end to return 'ok' to >>>> filesystem? >>>> could we send write to mirrors and return with one 'ok'? like a async >>>> write? >>>> >>>> -- >>>> Roberto Spadim >>>> Spadim Technology / SPAEmpresarial >>>> -- >>>> 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 >>> >> >> >> >> -- >> Roberto Spadim >> Spadim Technology / SPAEmpresarial >> > > > > -- > Roberto Spadim > Spadim Technology / SPAEmpresarial > -- Roberto Spadim Spadim Technology / SPAEmpresarial -- 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
