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?
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.
mark
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?
John R Pierce 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?
I *think* so.
mark
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 Lilo and Grub can access any disk or partition that can be accessed by the BIOS. Lilo cares not about 'partitions' at all: it does raw disk access using raw LBA32 (modern) or CHS (old) addressing). Grub understands ext2 file systems. Neither Lilo nor Grub understand about LVM or RAID (they don't actually need to). /boot cannot be inside a 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 disk dies, make sure that the boot loader is on both disks (eg do a grub-install on the second disk as well as the first disk, similar magic for lilo). That way if the first disk of the raid mirror set dies, you can 'swap' the bad drive out, put the good *second* drive in as what the BIOS sees as the first drive (if real SCSI or hot-swapable SATA, merely removing the bad drive is enough -- for IDE one needs to reach inside and have fun with cables and/or jumpers). You system will boot (with a degraded RAID set). (You can install a replacement drive, partition it, add it to the raid set and have things rebuild).
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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.
mark
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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