# [OmniOS-discuss] trouble with ashift and 4k blocks

Michael Talbott mtalbott at lji.org
Sun Aug 23 00:38:55 UTC 2015

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    The output from format you provided shows that the kernel is only seeing 2TB, so I would think it's not an issue of the zfs at all, rather, it's the hardware not communicating the full capacity to the server. You're likely running into a limitation of the SAS/SATA controller its connected to or it might be the drive has a jumper set to limit the capacity to 2TB. There might be a firmware update for your SATA/SAS controller to overcome that limit. But definitely check on the drive to see if there's a jumper set on it first.

    I would test if it's a hardware or OS issue by temporarily booting into a linux distro and checking what it has to say about the drive's capacity. If linux says the same thing, it's almost certainly a hardware/firmware limitation.

    > On Aug 22, 2015, at 2:49 PM, Doug Hughes <doug at will.to> wrote:
    >
    >   3. c0t3d0 <ATA-HGST HDS724040AL-A580-2.00TB>
    >           /pci at 0,0/pci8086,340c at 5/pci1000,3150 at 0/sd at 3,0
    >        4. c0t4d0 <ATA-HGST HDS724040AL-A580-2.00TB>
    >           /pci at 0,0/pci8086,340c at 5/pci1000,3150 at 0/sd at 4,0
    >        5. c0t5d0 <ATA-HGST HDS724040AL-A580-2.00TB>

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