On Wed, Jul 30, 2008 at 12:18:06PM -0400, Bill Davidsen wrote: > Richard Michael wrote: > >Hello list, > > > >I'm building a new system with 8 disks, in two RAID5 arrays of 4 disks > >each, and a RAID1 array across them. (Then LVM2 on top of the RAID1 > >array.) > > > >I approached it this way for two reasons: > > > >1/ It feels "cleanest"; in the sense that it's not a special case, it's > >just RAID1 with two devices, which happen to be RAID5. To me it seems muddy. Just having one big raid5 or raid10 would be cleaner and give better performance. > >2/ I have a particular usage in mind: I need to be able to split the > >mirror and remove half; return it later and resync. Therefore, I want > >to know which disks comprise which halves. I am not sure what you mean with this. You want to remove half of the disks? I think you can do that with raid10, you just remove every other disk. I have not tried that out, however. You could try it out before actually emplouing it. > >However, I'm rethinking toward RAID10. However, I can't find much > >documentation about layout, etc. I believe this was recently discussed > >on the list. There is documentation on http://linux-raid.osdl.org/ and on http://std.dkuug.dk/keld/stripemirror.html (for raid10,f2), and on http://en.wikipedia.org/wiki/Non-standard_RAID_levels Best regards keld -- 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
