Re: Where to put logs in a RAUD 1+0 system

On Mon, 19 Apr 2004 09:30:39 -0400, DNix wrote: Paul's got it. To build RAID10 (versus RAID01) first you create N mirrored pairs then you stripe the mirror devices. This gives you greater safety and improved recovery time over RAID01. Performance is identical with either RAID10 or RAID01. Art S. Kagel > "Art S. Kagel" <kagel@bloomberg.net> wrote in message > news:<pan.2004.04.02.08.20.02.153746.1445@bloomberg.net>... >> On Thu, 01 Apr 2004 03:57:48 -0500, Andy Kent wrote: >> >> I mostly agree with Andy, put everything on the single RAID10 array. If >> the server were to be heavily loaded with update activity then perhaps you >> could make a case for reserving one pair of drives for a mirror (RAID1) to >> contain just the ROOTDB and LOGSDB. But if the load will not be high, I >> would not bother. >> >> Art S. Kagel >> >> PS: Remember to stripe the 5 mirrored pairs not the other way around. > > Hi Art, > You lost me here, what exactly did you mean by "PS: Remember to stripe the 5 > mirrored pairs not the other way around."? > > > >> > I'm about to configure a brand new, fast RAID 1+0-based system which will >> > use logged sbspaces. Conventional (JABOD-based) wisdom tells me to put >> > the logs on a separate device to the busy storage spaces. But, on a >> > 5-disk array, does this idea justify holding back one disk for the logs >> > and just configuring RAID 1+0 on the other four? Is it worth it or is the >> > idea simply too messy? The system will be quite lightly loaded but the >> > sbspaces could make up the bulk of the activity and could actually be >> > written more than read. >> > >> > If we went for just sticking the whole lot in a single array, is there >> > any point in putting teh logs outside rootdbs? >> > >> > Many thanks, >> > >> > >> > Andy Kent >> > Bristol, UK >> >