Brett Serkez spake the following on 4/1/2007 3:04 PM: > I performed a test install of CentOS Beta 5 on a system with two ~60 > GB drives. When installing CentOS 4 on this system, I normally work > thru setting up Software RAID with identically sized partitions on > each drive. > > For my test, the CentOS installer only presented a single drive. I > took the default of letting it do what it wanted. After looking over > the system I have verified that /boot is using DMRAID, but it isn't > not clear if the balance of the drive for the root file system is > using both drives or not, I think it might be. > > Using fdisk, I can see both disks are carved out identically: > > Device Boot Start End Blocks Id System > /dev/hda1 * 1 13 104391 83 Linux > /dev/hda2 14 7297 58508730 8e Linux LVM > > /dev/hdd1 * 1 13 104391 83 Linux > /dev/hdd2 14 7297 58508730 8e Linux LVM > > Using dmraid it *looks* like the drives are mirrored in total? > > dmraid -r -D > /dev/hda: pdc, "pdc_bacfgfjaf", mirror, ok, 117231345 sectors, data@ 0 > /dev/hdd: pdc, "pdc_bacfgfjaf", mirror, ok, 117231345 sectors, data@ 0 > > But then using df it is less obvious: > > df -h > Filesystem Size Used Avail Use% Mounted on > /dev/mapper/VolGroup00-LogVol00 54G 1009M 50G 2% / > /dev/mapper/pdc_bacfgfjafp1 99M 11M 83M 12% /boot > tmpfs 125M 0 125M 0% /dev/shm > > pvs shows VolGroup00 as using pdc_bacfgfjafp2: > > PV VG Fmt Attr PSize PFree > /dev/mapper/pdc_bacfgfjafp2 VolGroup00 lvm2 a- 55.78G 32.00M > > which is RAID1?????? > > Seems to be: > > dmraid -s > *** Active Set > name : pdc_bacfgfjaf > size : 117231232 > stride : 128 > type : mirror > status : ok > subsets: 0 > devs : 2 > spares : 0 > > Am I properly understanding that by default, CentOS 5 is creating a > full drive mirrored RAID? Then for other than the boot partition, it > is laying LVM over this mirrored RAID, presumably to allow adjustments > later? > > Thank you in advance, > > Brett Does the board have an onboard fakeraid? I think that is what DMRAID does. It supports some of the fakeraid controllers, although it is much less mature than plain software raid. -- MailScanner is like deodorant... You hope everybody uses it, and you notice quickly if they don't!!!!