one ZFS volume sometimes appears twice at the computer level

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one ZFS volume sometimes appears twice at the computer level

Post by grahamperrin » Sat Sep 22, 2012 2:35 pm

A minor issue.

One volume 'zhandy' sometimes appears twice at the computer level in Finder. MacBookPro5,2 with 8 GB memory.

Observed on the morning of 15th September, a few hours after the Community Edition was installed. There are truly two volumes with the same name, one of which is a read-only backup, a child file system. In Finder I selected all three icons then keyed Command-I; only two info windows appeared, and a mount command confirmed that there were no more than two volumes with that name.

Since then, the issue has been observed on maybe a handful of occasions. Most recently observed a few hours ago, when a number of external disks were connected before I started the OS, this incident is captured in a screen recording, ZEVO Community Edition 1.1 on released Build 12C54 of OS X 10.8.2.

I don't recall seeing the issue with any Ten's Complement ZEVO on lesser versions of the OS.

In the shot from 15th September, the eject icon for two of the three suggests that the duplication, apparent in Finder, affects (or affected) a Storejet Transcend (0x2329) on USB with the following characteristics:

Code: Select all
sh-3.2$ date
Sat 22 Sep 2012 20:40:34 BST
sh-3.2$ sw_vers
ProductName:   Mac OS X
ProductVersion:   10.8.2
BuildVersion:   12C54
sh-3.2$ sudo zdb -C zhandy
Password:

MOS Configuration:
        version: 28
        name: 'zhandy'
        state: 0
        txg: 2004164
        pool_guid: 4688397874579579662
        hostname: 'macbookpro08-centrim.home@1B4C77AE-B80A-59F9-B5CB-7A86B7437D40'
        vdev_children: 1
        vdev_tree:
            type: 'root'
            id: 0
            guid: 4688397874579579662
            children[0]:
                type: 'disk'
                id: 0
                guid: 10616857169251329946
                path: '/dev/dsk/GPTE_1928482A-7FE4-482D-B692-3EC6B03159BA'
                whole_disk: 0
                metaslab_array: 30
                metaslab_shift: 32
                ashift: 9
                asize: 639786287104
                is_log: 0
                DTL: 173
                create_txg: 4
sh-3.2$ clear





sh-3.2$ diskutil list disk6
/dev/disk6
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *640.1 GB   disk6
   1:                        EFI                         209.7 MB   disk6s1
   2:                        ZFS                         639.8 GB   disk6s2
sh-3.2$ diskutil list disk7
/dev/disk7
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:             zfs_pool_proxy zhandy                 *635.7 GB   disk7
   1:       zfs_filesystem_proxy Pocket Time Machine     109.1 GB   disk7s1
sh-3.2$ clear





sh-3.2$ diskutil info disk7
   Device Identifier:        disk7
   Device Node:              /dev/disk7
   Part of Whole:            disk7
   Device / Media Name:      zhandy

   Volume Name:              zhandy
   Escaped with Unicode:     zhandy

   Mounted:                  Yes
   Mount Point:              /Volumes/zhandy
   Escaped with Unicode:     /Volumes/zhandy

   File System Personality:  ZFS
   Type (Bundle):            zfs
   Name (User Visible):      ZFS

   Content (IOContent):      zfs_pool_proxy
   OS Can Be Installed:      No
   Media Type:               Generic
   Protocol:                 USB
   SMART Status:             Not Supported
   Volume UUID:              0DE88D2B-F43B-5BCB-B91A-4E7C73218D00

   Total Size:               635.7 GB (635655159808 Bytes) (exactly 1241513984 512-Byte-Blocks)
   Volume Free Space:        55.1 GB (55110445568 Bytes) (exactly 107637589 512-Byte-Blocks)
   Device Block Size:        512 Bytes

   Read-Only Media:          No
   Read-Only Volume:         No
   Ejectable:                Yes

   Whole:                    Yes
   Internal:                 No
   OS 9 Drivers:             No
   Low Level Format:         Not supported

sh-3.2$
grahamperrin Offline

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Re: one ZFS volume sometimes appears twice at the computer l

Post by grahamperrin » Sun Sep 23, 2012 10:24 pm

… when a number of external disks were connected before I started the OS, this incident is captured in a screen recording


The topic with that recording: occasional eject, unmount issues.
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Re: one ZFS volume sometimes appears twice at the computer l

Post by strangeluck » Tue Oct 09, 2012 12:25 pm

grahamperrin wrote:A minor issue.

One volume 'zhandy' sometimes appears twice at the computer level in Finder. MacBookPro5,2 with 8 GB memory.

Observed on the morning of 15th September, a few hours after the Community Edition was installed. There are truly two volumes with the same name, one of which is a read-only backup, a child file system. In Finder I selected all three icons then keyed Command-I; only two info windows appeared, and a mount command confirmed that there were no more than two volumes with that name.

Since then, the issue has been observed on maybe a handful of occasions. Most recently observed a few hours ago, when a number of external disks were connected before I started the OS, this incident is captured in a screen recording, ZEVO Community Edition 1.1 on released Build 12C54 of OS X 10.8.2.

I don't recall seeing the issue with any Ten's Complement ZEVO on lesser versions of the OS.


I just want to add that when my backups fail, I've seen the Finder show two volumes with the same name. I'll add that I've seen the volume I'm backing up to added to the Finder sidebar. I don't know if it happens every time, but I'll pay closer attention next time I try it.

Thread regarding my backup failures:
http://zevo.getgreenbytes.com/forum/viewtopic.php?f=4&t=129&p=799#p799

Craig
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