I turned on TimeMachine and told it to use my Drobo volume for backups, and checked the box for encryption. It thought about it for a few minutes and then bailed with an error stating that it couldn't turn on encryption (I don't have specifics, unfortunately).
I then just turned on TimeMachine without encryption and it worked fine. Everything seemed normal until I rebooted ... Yosemite is unable to mount the Drobo, and Disk Utility doesn't provide any relief
## rebuildMasterList ##
**********
Disk: disk0 (APPLE HDD HTS541010A9E662 Media) - 0x7fa6cbe1a860
Partition: disk0s1 (EFI) - 0x7fa6cbf544d0
Partition: disk0s2 (Macintosh HD) [* boot volume] - 0x7fa6cbe1af60
Partition: disk0s3 (Recovery HD) - 0x7fa6cbf54850
Disk: disk1 (Drobo) - 0x7fa6cbe1abe0
Partition: disk1s1 (EFI) - 0x7fa6cbf55320
Partition: disk1s2 (disk1s2) - 0x7fa6cbd221c0
Partition: disk1s3 (Boot OS X) - 0x7fa6cbc207f0
Verify and Repair volume “disk1s2”
Starting repair tool:
repairError: Some information was unavailable during an internal lookup. - -69808
Error: Some information was unavailable during an internal lookup.
Disk Utility stopped repairing “disk1s2”: Some information was unavailable during an internal lookup.
mac:~ admin$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_HFS Macintosh HD 999.3 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *17.6 TB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_CoreStorage 17.6 TB disk1s2
3: Apple_Boot Boot OS X 134.2 MB disk1s3
So it looks like the stupid encryption thing didn't actually turn on encryption, but left the partition type as CoreStorage?? This is complicated by the fact that diskUtil's coreStorage tool doesn't work with it at all.
$ diskutil core storage list
No CoreStorage logical volume groups found
$ diskutil coreStorage info /dev/disk1
/dev/disk1 is not a CoreStorage disk
$ diskutil info /dev/disk1
Device Identifier: disk1
Device Node: /dev/disk1
Part of Whole: disk1
Device / Media Name: Drobo
Volume Name: Not applicable (no file system)
Mounted: Not applicable (no file system)
File System: None
Content (IOContent): GUID_partition_scheme
OS Can Be Installed: No
Media Type: Generic
Protocol: FireWire
SMART Status: Not Supported
Total Size: 17.6 TB (17592186044416 Bytes) (exactly 34359738368 512-Byte-Units)
Volume Free Space: Not applicable (no file system)
Device Block Size: 512 Bytes
Read-Only Media: No
Read-Only Volume: Not applicable (no file system)
Ejectable: Yes
Whole: Yes
Internal: No
OS 9 Drivers: No
Low Level Format: Not supported
With great promise, I purchased DiskWarrior 5 which won't even look at the drive because it's not mounted.
Then I tried Stellar Volume Optimizer which claims to repair busted volumes, but it won't touch it either because it says the logical volume is encrypted (even though DiskUtility suggests it isn't).
What's next? Is there a way to forcibly change the partition type back to HFS+ journaled? My suspicion is that it's just the partition type that's misleading everything else.
