On Wednesday, December 09, 2015 03:19:45 AM John Runyon wrote: > I recently received and installed a 3TB drive. Before formatting it, I > zeroed the first GiB (dd if=/dev/zero of=/dev/sdb bs=1M count=1024). > Then formatted with gdisk. > > Both gdisk and parted report the partition table correctly as containing a > ~1MB (empty) sdb1 and ~2.7TB sdb2 (with a protective MBR). However, on boot, > only one partition is recognized: the 1MB sdb1. And yet after running > partprobe, sdb2 will magically appear. > > I've managed to work around this for now with a /etc/local.d/ file that > just does "partprobe; mount /home" but I'd like to figure out the underlying > cause... Has anyone ever run into this before? > > # grep sdb /var/log/messages > Dec 9 01:38:49 precision kernel: [ 1.224703] sd 1:0:0:0: [sdb] > 5860533168 512-byte logical blocks: (3.00 TB/2.72 TiB) Dec 9 01:38:49 > precision kernel: [ 1.228246] sd 1:0:0:0: [sdb] 4096-byte physical > blocks Dec 9 01:38:49 precision kernel: [ 1.230017] sd 1:0:0:0: [sdb] > Write Protect is off Dec 9 01:38:49 precision kernel: [ 1.231765] sd > 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support > DPO or FUA Dec 9 01:38:49 precision kernel: [ 1.245054] sdb: sdb1 > Dec 9 01:38:49 precision kernel: [ 1.247172] sd 1:0:0:0: [sdb] Attached > SCSI disk Dec 9 01:38:57 precision kernel: [ 23.777108] sdb: sdb1 > Dec 9 01:38:58 precision kernel: [ 25.120921] EXT4-fs (sdb2): mounted > filesystem with ordered data mode. Opts: (null) > > # gdisk -l /dev/sdb > GPT fdisk (gdisk) version 1.0.1 > > Partition table scan: > MBR: protective > BSD: not present > APM: not present > GPT: present > > Found valid GPT with protective MBR; using GPT. > Disk /dev/sdb: 5860533168 sectors, 2.7 TiB > Logical sector size: 512 bytes > Disk identifier (GUID): 0A8A7DB1-45D0-44DD-AACB-1A4957077401 > Partition table holds up to 128 entries > First usable sector is 34, last usable sector is 5860533134 > Partitions will be aligned on 2048-sector boundaries > Total free space is 2014 sectors (1007.0 KiB) > > Number Start (sector) End (sector) Size Code Name > 1 2048 4095 1024.0 KiB 8300 Linux filesystem > 2 4096 5860533134 2.7 TiB 8300 Linux filesystem > > # parted -l > [...] > Model: ATA ST3000DM001-1ER1 (scsi) > Disk /dev/sdb: 3001GB > Sector size (logical/physical): 512B/4096B > Partition Table: gpt > Disk Flags: > > Number Start End Size File system Name Flags > 1 1049kB 2097kB 1049kB Linux filesystem > 2 2097kB 3001GB 3001GB ext4 Linux filesystem > [...]
How old is the BIOS in your system? Older systems have issues recognizing disks larger than 2TB, Linux has a history of being able to ignore that. I am not sure how that works with boot- disks though. -- Joost
