Bowie Bailey spake the following on 3/2/2006 6:47 AM: > Matt Hyclak wrote: >> On Thu, Mar 02, 2006, Fajar Priyanto enlightened us: >>> I'm setting up Centos4.2 on 2x80GB SATA drives. >>> >>> The partition scheme is like this: >>> /boot = 300MB >>> / = 9.2GB >>> /home = 70GB >>> swap = 500MB >>> >>> >>> The RAID is RAID 1. >>> md0 = 300MB = /boot >>> md1 = 9.2GB = LVM >>> md2 = 70GB = LVM >>> md3 = 500MB = LVM >>> >>> Now, the confusing part is: >>> 1. When creating VolGroup00, should I include all PV (md1, md2, >>> md3)? Then create the LV. >>> 2. When setting up RAID 1, should I make those separated partitions >>> for /, /home, and swap? Or, should I just make one big RAID device? >>> >>> The future purpose of using LVM is I want to be able to expand any >>> partitions that would run out of space into a new disk. >> Personally, I would do: >> >> md0 = 300MB (/boot) >> md1 = 500MB (swap) >> md2 = remainder (pv.00) >> >> I would then create a single volume group on md2, create / and home, >> but I would leave 20-30% of the VG empty so you can expand later. >> That would work out to like 10GB /, and 50GB /home, and leave you 15 >> or so GB for expansion. > > Or you could do this: > > RAID 1 partition: > md0 = 80GB (or whatever the useable total is) > > Then include md0 in VolGroup00 and create your logical volumes. > > LV0 = 300MB (/boot) > LV1 = 500MB (swap) > LV2 = 9.2GB (/) > LV3 = 70GB (/home) > > This way everything is mirrored and everything is in one VG. If you > need more space, add another pair of mirrored drives and add the new > mirrored device into VolGroup00. Then you can use the space to expand > whichever filesystem needs it. I would also advise following the > previous poster's advice and leaving a few GB unused so that you > aren't forced to add more drives immediately when LV2 fills up faster > than you expected. > But you can't boot from a /boot partition in LVM. It needs to be either a physical partition or a raid1 array.