bus issue after Blackmagic Disk Speed Test during backup

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bus issue after Blackmagic Disk Speed Test during backup

Post by grahamperrin » Fri Oct 26, 2012 2:05 am

2012-10-22 bus issue after running Blackmagic Disk Speed Test.app during a backup

Whilst screenshots there do not show Blackmagic Disk Speed Test (sorry), my recollection is that problems began after I selected – in that app – what I believed to be the ZFS file system gjp22 that is my home directory. That belief, based on the home icon in the sheet presented by the app …

… I also vaguely recall there being more than two listings for gjp22 (it's often normal to have two, one of which is a read-only backup; abnormal to see three or more).

In retrospect, I wonder whether iconography was confused and if so: whether something other than writeable volume gjp22 was truly selected.
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Thoughts

Post by grahamperrin » Tue Jan 01, 2013 2:24 am

Reviewing this topic alongside gpt show versus zfs_pool_proxy, versus unmounted volumes

Ignore the gpt aspect, focus on this:

… interesting that the pool/dataset gjp22 (in use by user gjp22 as a home directory) is gone so easily … 


I wonder whether a Blackmagic Disk Speed Test unmount of the file system caused the bus error.

If the problem is not reproducible by other users who have a file system at the root of a pool as their home directory, then I should consider the more exotic:

  • Core Storage encryption of my ZFS home.

Currently:

Code: Select all
macbookpro08-centrim:~ gjp22$ diskutil list disk0
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *750.2 GB   disk0
   1:                        EFI                         209.7 MB   disk0s1
   2:                  Apple_HFS swap                    32.0 GB    disk0s2
   3: FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF               536.9 MB   disk0s3
   4:                  Apple_HFS spare                   671.1 MB   disk0s4
   5:          Apple_CoreStorage                         99.5 GB    disk0s5
   6:                 Apple_Boot Boot OS X               650.0 MB   disk0s6
   7:          Apple_CoreStorage                         616.3 GB   disk0s7
   8:                 Apple_Boot Boot OS X               134.2 MB   disk0s8

Code: Select all
macbookpro08-centrim:~ gjp22$ diskutil coreStorage list
CoreStorage logical volume groups (2 found)
|
+-- Logical Volume Group 039C0D47-F3CF-44D3-A825-B48F01FCF334
|   =========================================================
|   Name:         OS
|   Status:       Online
|   Size:         99484213248 B (99.5 GB)
|   Free Space:   0 B (0 B)
|   |
|   +-< Physical Volume 86D2FA98-8C69-4828-B909-8312AE4A75E2
|   |   ----------------------------------------------------
|   |   Index:    0
|   |   Disk:     disk0s5
|   |   Status:   Online
|   |   Size:     99484213248 B (99.5 GB)
|   |
|   +-> Logical Volume Family 7AA96B8E-0E41-4C3F-9589-5FAE0C956372
|       ----------------------------------------------------------
|       Encryption Status:       Unlocked
|       Encryption Type:         AES-XTS
|       Conversion Status:       Complete
|       Conversion Direction:    -none-
|       Has Encrypted Extents:   Yes
|       Fully Secure:            Yes
|       Passphrase Required:     Yes
|       |
|       +-> Logical Volume B13EE5BF-5D08-49D3-94C2-DF58AFEA1D08
|           ---------------------------------------------------
|           Disk:               disk1
|           Status:             Online
|           Size (Total):       99165437952 B (99.2 GB)
|           Size (Converted):   -none-
|           Revertible:         No
|           LV Name:            OS
|           Volume Name:        OS
|           Content Hint:       Apple_HFS
|
+-- Logical Volume Group 902434C9-0131-4E3A-AE15-2B8B938087AD
    =========================================================
    Name:         gjp22-cs
    Status:       Online
    Size:         616336003072 B (616.3 GB)
    Free Space:   0 B (0 B)
    |
    +-< Physical Volume 179AADE6-34F1-404C-A994-9FD99C881BA6
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk0s7
    |   Status:   Online
    |   Size:     616336003072 B (616.3 GB)
    |
    +-> Logical Volume Family FFCE2FAF-BE8E-4FEF-9F3E-E221C6CBCA11
        ----------------------------------------------------------
        Encryption Status:       Unlocked
        Encryption Type:         AES-XTS
        Conversion Status:       Complete
        Conversion Direction:    -none-
        Has Encrypted Extents:   Yes
        Fully Secure:            Yes
        Passphrase Required:     Yes
        |
        +-> Logical Volume 0CFAFD38-E79B-40AC-A4BE-63296E6B4331
            ---------------------------------------------------
            Disk:               disk7
            Status:             Online
            Size (Total):       616017227776 B (616.0 GB)
            Size (Converted):   -none-
            Revertible:         No
            LV Name:            gjp22-cs
            Content Hint:       Apple_HFS

Code: Select all
macbookpro08-centrim:~ gjp22$ diskutil list disk7
/dev/disk7
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *616.0 GB   disk7
   1:                        EFI                         209.7 MB   disk7s1
   2:                        ZFS                         615.7 GB   disk7s2

Code: Select all
macbookpro08-centrim:~ gjp22$ mount | grep gjp22
/dev/disk8 on /Volumes/gjp22 (zfs, local, journaled, noatime)
/dev/disk8s1 on /Volumes/gjp22/casesensitive (zfs, local, journaled, noatime)
/dev/disk13s2 on /Volumes/AppleSeed (hfs, local, nodev, nosuid, journaled, noowners, mounted by gjp22)
Wuala on /Volumes/WualaDrive (osxfusefs, local, nodev, nosuid, synchronous, mounted by gjp22)

Code: Select all
macbookpro08-centrim:~ gjp22$ diskutil list disk8
/dev/disk8
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:             zfs_pool_proxy gjp22                  *614.2 GB   disk8
   1:       zfs_filesystem_proxy casesensitive           152.9 GB   disk8s1
   2:       zfs_filesystem_proxy opt                     159.4 GB   disk8s2
macbookpro08-centrim:~ gjp22$
grahamperrin Offline

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