On Wed, Feb 25, 2009 at 05:10:58PM -0600, Ron Johnson wrote: > On 02/25/2009 04:37 PM, Douglas A. Tutty wrote: > >On Wed, Feb 25, 2009 at 04:48:30PM -0500, Lennart Sorensen wrote: > >>On Wed, Feb 25, 2009 at 02:55:09PM -0600, Ron Johnson wrote: > >>>Who boots off of (or puts / on) a 2TB partition? > >>Someone with a 4 drive raid5 on a hardware controller with 750GB SATA > >>drives. Hence the only drive in the system is a 2.25TB device with > >>partitions and everything on it. The root partition isn't very big, > >>but it's on a drive that is bigger than 2TB and hence needs something > >>other than a DOS partition table. > > > >Why wouldn't you configure the raid controller to give you a small > >logical drive (with whatever raid config you want) for the OS, and the > >larger logical drive for your data (or for LVM for everything except /)? > > I think it's because "disk" itself (which is what the boot loader > sees) is .gt. 2TB. Not with my NetRaid card. It takes the physical disks and assembles them into virtual disks which appear to the OS as sd* of whatever size.
Info on the underlying physical drives (and the virtual disks and the controller) show up under /proc/megaraid. Here's dmesg | grep -i scsi: SCSI subsystem initialized scsi0:Found MegaRAID controller at 0xf8814000, IRQ:177 scsi0 : LSI Logic MegaRAID F 254 commands 16 targs 4 chans 7 luns scsi0: scanning scsi channel 0 for logical drives. Type: Direct-Access ANSI SCSI revision: 02 Type: Direct-Access ANSI SCSI revision: 02 scsi0: scanning scsi channel 4 [P0] for physical devices. SCSI device sda: 51200000 512-byte hdwr sectors (26214 MB) SCSI device sda: 51200000 512-byte hdwr sectors (26214 MB) sym0: SCSI BUS has been reset. sym0: SCSI BUS mode change from SE to SE. scsi1 : sym-2.2.3 sym0: SCSI BUS has been reset. sd 0:0:0:0: Attached scsi disk sda SCSI device sdb: 39858176 512-byte hdwr sectors (20407 MB) SCSI device sdb: 39858176 512-byte hdwr sectors (20407 MB) sd 0:0:1:0: Attached scsi disk sdb The megaraid controller shows up as a scsi hba with two drives (sda, sdb) on it. In this case, sda is a raid1 array and sdb is a raid0 array; the OS knows nothing about this, however. Doug. -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
