At Thu, 14 Oct 2010 13:57:58 -0400 CentOS mailing list centos@centos.org wrote:
Robert Heller wrote:
At Thu, 14 Oct 2010 09:53:52 -0700 CentOS mailing list centos@centos.org wrote:
On 10/14/10 6:53 AM, m.roth@5-cent.us wrote:
Ritika Garg wrote:
Can CentOS be installed on an extended partition? System has the
following
partitions: OEM(reserved)-78MB(primary) System-100MB(primary) C-55GB(primary) D-100GB(extended) Can I divide D into 2 parts:70GB and 30GB and install CentOS in the
70GB
logical partition?
Of course. Extended or primary is an old, old DOS separation, but once they exist, everything just treats it as another partition.
/boot still has to be on a primary, doesn't it?
No. The *only* thing that needs to be in any partitular place is the boot loader -- this is a BIOS thing: the BIOS wants the boot loader (or actually the first stage of it) in the MBR of the first disk. Both
<snip> > LVM VG. It can be a *mirrored* (RAID1) set. Trickyness: if your /boot > raid set is on the first & second disk (eg /dev/sda and /dev/sdb or > /dev/hda and /dev/hdb) and you want to be able to boot if the first <snip> Ah, but what about hardware raid, say, a Dell PERC 7, with the two internal drives raided by that, *not* by software? I'm not sure I can see them as separate disks to grub-install.
With hardware RAID, the BIOS, lilo/grub, Linux, etc. just 'see' whatever logical disk(s) the hardware RAID controller presents to the system. The underlying structure is 'hidden' from view by the hardware RAID controller. With most (true) hardware RAID controllers, the logical disks should up as SCSI disks (usually with some 'fake' drive model number), by using the kernel's SCSI disk abstraction layer (the DAC960 driver does its own thing as far as a block structured abstraction). When you write to the MBR of this 'disk', the hardware RAID would mirror (or whatever, depending on the level of RAID -- with only 2 disks, it would be either RAID0 (striped) or RAID1 (mirrored)) the writes. I was only talking about Linux's *software* RAID, which does NOT apply to MBRs (which cannot be part of software RAID sets, unless whole raw disks are being RAIDed, in which case there isn't a MBR at all, or not something the *BIOS* can deal with as such).
mark
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