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Asked: 2017-08-31 18:00:52 +0800 CST

Only 2 TB recognized from 4 TB Seagate disk

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In the same server I have a bunch of 4 TB Seagate disks. I just installed them and I realized that some are recognized as 4 TB, but some as 2 TB. What could be the issue?

$ dmesg | grep '8:0:3:0'
[   10.810825] scsi 8:0:3:0: Direct-Access     ATA      ST4000DM005-2DP1 0001 PQ: 0 ANSI: 5
[   11.508060] sd 8:0:3:0: [sdf] 7814037168 512-byte logical blocks: (4.00 TB/3.64 TiB)
[   11.508061] sd 8:0:3:0: [sdf] 4096-byte physical blocks
[   11.508064] sd 8:0:3:0: Attached scsi generic sg5 type 0
[   11.508089] sd 8:0:3:0: [sdf] Write Protect is off
[   11.508090] sd 8:0:3:0: [sdf] Mode Sense: 00 3a 00 00
[   11.508100] sd 8:0:3:0: [sdf] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   11.524947] sd 8:0:3:0: [sdf] Attached SCSI disk

$ dmesg | grep 9:0:4:0
[   13.235315] scsi 9:0:4:0: Direct-Access     ATA      ST4000DM005-2DP1 0001 PQ: 0 ANSI: 5
[   13.240191] sd 9:0:4:0: Attached scsi generic sg14 type 0
[   13.241734] sd 9:0:4:0: [sdo] 4294967294 512-byte logical blocks: (2.20 TB/2.00 TiB)
[   13.278030] sd 9:0:4:0: [sdo] Write Protect is off
[   13.278031] sd 9:0:4:0: [sdo] Mode Sense: 73 00 00 08
[   13.280316] sd 9:0:4:0: [sdo] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   13.392557] sd 9:0:4:0: [sdo] Attached SCSI disk

smartctl says that both drives are 4 TB. parted sees them as 4 TB and 2 TB, respectively:

$ parted /dev/sdf unit s print
Model: ATA ST4000DM005-2DP1 (scsi)
Disk /dev/sdf: 7814037168s
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags: 

Number  Start  End          Size         File system  Name     Flags
 1      2048s  7814035455s  7814033408s               primary  raid

$ parted /dev/sdo unit s print
Model: ATA ST4000DM005-2DP1 (scsi)
Disk /dev/sdo: 4294967294s
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start  End          Size         File system  Name     Flags
 1      2048s  4294965247s  4294963200s               primary  raid

Update:

It seems the issue is that some drives are attached to the LSI SAS1068E SCSI storage controller and that one has a 2 TB drive limitation.

Not sure if there is a workaround for this. :-(

hard-drive

2 Answers

  1. The drives are in RAID format. As long as the RAID shows up as 4G or 8G, you're fine. If the RAID shows up as something else, then one of your GPT partition tables is corrupt, and needs to be re-written.

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  2. Try this (after wiping the partitions from the disk so it's empty):

    parted /dev/sdo
 mklabel gpt
 mkpart primary 0GB 4096GB

    You can replace "primary" with another name for the partition.
    "4096GB" corresponds to the maximum usable size of the disk so you might have to lower this to match the actual usable space, to something like "3906GB", etc.

    You should be able to check the available space with fdisk:

    fdisk /dev/sdo

    then type p to list partitions and drive data.

    If everything worked, you should see the drive as a 4TB one in parted and if so, just proceed to formatting and mounting as usual with mkfs and mount.

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