misc/187905: Confusion zpool with a block size in HDD - block size: 512B configured, 4096B native

[Vladislav V. Prodan]

>Number:         187905
>Category:       misc
>Synopsis:       Confusion zpool with a block size in HDD - block size: 512B configured, 4096B native
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Mar 24 18:20:00 UTC 2014
>Closed-Date:
>Last-Modified:
>Originator:     Vladislav V. Prodan
>Release:        FreeBSD 10.0
>Organization:
support.od.ua
>Environment:
FreeBSD bimbo.YYY 10.0-STABLE FreeBSD 10.0-STABLE #0: Sun Mar 23 08:14:35 EET 2014 root at bimbo.YYY:/usr/obj/usr/src/sys/bimbo.3 amd64
>Description:
On a machine using ZFS, after upgrading from 9.0 to 10.0, zpool status
says:

# zpool status
  pool: tank
 state: ONLINE
status: One or more devices are configured to use a non-native block size.
        Expect reduced performance.
action: Replace affected devices with devices that support the
        configured block size, or migrate data to a properly configured
        pool.
  scan: scrub repaired 0 in 4h42m with 0 errors on Mon Mar 24 05:38:49 2014
config:

        NAME               STATE     READ WRITE CKSUM
        tank               ONLINE       0     0     0
          gpt/system-ada1  ONLINE       0     0     0  block size: 512B configured, 4096B native

errors: No known data errors


ashift: 9

# zdb -U /boot/zfs/zpool.cache
tank:
    version: 28
    name: 'tank'
    state: 0
    txg: 9794975
    pool_guid: 14509785011519350988
    hostid: 3616469326
    hostname: 'bimbo.fitnessfactor.com.ua'
    vdev_children: 1
    vdev_tree:
        type: 'root'
        id: 0
        guid: 14509785011519350988
        children[0]:
            type: 'disk'
            id: 0
            guid: 17960990484356700785
            path: '/dev/gpt/system-ada1'
            phys_path: '/dev/gpt/system-ada1'
            whole_disk: 1
            metaslab_array: 30
            metaslab_shift: 31
            ashift: 9
            asize: 495807889408
            is_log: 0
            DTL: 82314
            create_txg: 4

# diskinfo -v /dev/ada0
/dev/ada0
        512             # sectorsize
        500107862016    # mediasize in bytes (466G)
        976773168       # mediasize in sectors
        4096            # stripesize
        0               # stripeoffset
        969021          # Cylinders according to firmware.
        16              # Heads according to firmware.
        63              # Sectors according to firmware.
        S20BJ90D306953  # Disk ident.


# smartctl -a /dev/ada0
smartctl 6.2 2014-02-18 r3874 [FreeBSD 10.0-STABLE amd64] (local build)
Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Seagate Barracuda SpinPoint F3
Device Model:     ST500DM005 HD502HJ
Serial Number:    S20BJ90D306953
LU WWN Device Id: 5 0004cf 209d3bdd6
Firmware Version: 1AJ10001
User Capacity:    500 107 862 016 bytes [500 GB]
Sector Size:      512 bytes logical/physical
Rotation Rate:    7200 rpm
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA8-ACS T13/1699-D revision 6
SATA Version is:  SATA 2.6, 3.0 Gb/s
Local Time is:    Mon Mar 24 20:00:48 2014 EET
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
..


>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: