public inbox for gentoo-user@lists.gentoo.org
 help / color / mirror / Atom feed
* [gentoo-user] System only recognizes 1 of 2 partitions
@ 2015-12-09  9:19 John Runyon
  2015-12-09 12:58 ` J. Roeleveld
  0 siblings, 1 reply; 3+ messages in thread
From: John Runyon @ 2015-12-09  9:19 UTC (permalink / raw
  To: gentoo-user

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
[...]


^ permalink raw reply	[flat|nested] 3+ messages in thread
* Re: [gentoo-user] System only recognizes 1 of 2 partitions
@ 2015-12-09 13:13 John Runyon
  0 siblings, 0 replies; 3+ messages in thread
From: John Runyon @ 2015-12-09 13:13 UTC (permalink / raw
  To: gentoo-user

Its not a boot disk. / and /boot are on 500GB, MBR-only sda.

BIOS is ~2011 i'd guess. Its a Dell.

"J. Roeleveld" <joost@antarean.org> wrote:

>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
>

^ permalink raw reply	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2015-12-09 13:13 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2015-12-09  9:19 [gentoo-user] System only recognizes 1 of 2 partitions John Runyon
2015-12-09 12:58 ` J. Roeleveld
  -- strict thread matches above, loose matches on Subject: below --
2015-12-09 13:13 John Runyon

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox