On Fri, 8 Jul 2005 at 2:40pm, Turbo Fredriksson wrote > Quoting Eric Pretorious <eric@xxxxxxxxxxxxxx>: > > > On Monday 04 July 2005 04:27 am, Turbo Fredriksson wrote: > >>WHY are you putting multiple md's on the same disks? Did you intend to > >>do something like this? > >> > >> md0 /boot sd[ab]1 > >> md1 / sd[ab]2 > >> md2 /usr sd[ab]3 > >> md3 /var sd[ab]4 > >> > >>Just one question (this is the magic :). What do you gain by this? And > >>why do you do it? > > > > I'm just trying to mirror two disks - that's all. Is there a better way? > > The keyword(s) here is _same disk_. > > This is a very complicated way to do it... The idea behind partitioning the > disk(s) this way (many partition, one partition for 'each important FS') is > 'to protect the root partition' (or rather 'protect the file systems from > each others failures'). That is, a crash in the /var FS (or that partition) > will not interfere against the /usr FS/partition etc... There are other reasons to use multiple partitions. Having /home as a separate partition, e.g., allows one to reinstall without copying the data off to another machine. It also prevents a user from filling up the root fs, which often has bad consequences. The same goes for partitions for /tmp and/or /var. > Just create ONE partition (plus a swap on each disk, totaling the total amount > of swap you want/need) and set that up as md0 (mounted as /) and that's it! But then if a disk dies, the system is still going to crash, b/c half the swap is suddenly gone. If you want the system to not crash if a disk dies, then you must mirror swap as well. -- Joshua Baker-LePain Department of Biomedical Engineering Duke University - 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
