diglloyd Mac Performance Guide
ThunderBay 4 - The Speed To Create. The Capacity To Dream.
Mac Pro “Sweet Spot”
Mac Pro Reviews by diglloyd

MacMini and Fusion Drive Setup

Update on the update: see the Nov 8 discussion.

...

UPDATE: extensive attempts to force Fusion “migration” have met with disappointment. This is on a 2012 MacMini with the “special” Disk Utility using an internal 240GB SSD + 1TB hard drive, reads forced many times on a small subset of files — attempted as both a non-boot drive and as a boot drive. No-go. Stated simply: this dog don’t hunt. [sic] Well, maybe Apple’s preconfigured solution works, but I am dubious it has more than trivial value for any serious work, and at the cost of much more complexity.

Separate SSD and HDD volumes are a much smarter move anyway: lower complexity, and using the appropriate device appropriately will always result in better performance. A “catch up” optimization-long-after-it-matters strategy is a handicapped substitute for a well architected system. Fine for dilettante systems reading email and playing games, but real work has other demands.

Peak system performance comes from the long-standing optimization rule: 10% of the code takes 90% of the time. So optimize that and stop playing games with crappy $250 two-tier approximations— that $250 will buy an OWC 240GB SSD, so why pay Apple for a maybe-it-sorta-helps solution?

Even if Fusion migration works (somehow, someday, sometime), it won’t help my usual workflow, which is job-based stuff— the Fusion stuff will always be several steps behind— never optimal.

To make a long story short: Fusion migration does not seem to work with a 3rd party SSD.

Fusion volume consisting of 240GB SSD and 1TB HDD in 2012 MacMini (Not the bug in free space)
Disk Utility version used

...

A fusion drive has apparently been created properly using a 1TB hard drive and an OWC 240GB Mercury Extreme Pro 6G SSD, in a 2012 Mac Mini (MacMini6,2), on loan from OWC.

 

 

Testing in progress, report to follow. Command line geek stuff further below.

Fusion volume consisting of 240GB SSD and 1TB HDD in 2012 MacMini (Not the bug in free space)
Fusion volume consisting of 240GB SSD and 1TB HDD in 2012 MacMini6,2
(Not the bug in free space)

Extreme caution advised— Disk Utility destroyed the contents of both internal volumes simply by rebooting onto an external drive (both internal drives were working perfectly prior, no issue existed with either, and I repeated this behavior twice). Well, I was going to do this anyway, so no big deal anyway, but wow.

Disk Utility apparently detected a previous Core Storage setup on the hard drive, and took that as a damaged Fusion setup, and proceeded to offer to “fix” both drives— by erasing them in their entirety, destroying all data on both. The first time it hung, the 2nd time it succeeded in automatically creating a “fused” volume from the SSD and HDD, saving me the trouble of doing so on the command line.

Fusion volume consisting of 240GB SSD and 1TB HDD in 2012 MacMini (Not the bug in free space)
When the cure is worse than the disease: no problem exists. Total data loss (erasure) with “Fix”.

For geeks:

MPGmini:~ admin$ diskutil list
/dev/disk0
#:                       TYPE NAME                    SIZE       IDENTIFIER
0:      GUID_partition_scheme                        *240.1 GB   disk0
1:                        EFI                         209.7 MB   disk0s1
2:          Apple_CoreStorage                         239.7 GB   disk0s2
3:                 Apple_Boot Boot OS X               134.2 MB   disk0s3
/dev/disk1
#:                       TYPE NAME                    SIZE       IDENTIFIER
0:      GUID_partition_scheme                        *1.0 TB     disk1
1:                        EFI                         209.7 MB   disk1s1
2:          Apple_CoreStorage                         999.9 GB   disk1s2
3:                 Apple_Boot Boot OS X               134.2 MB   disk1s3
/dev/disk2
#:                       TYPE NAME                    SIZE       IDENTIFIER
0:      GUID_partition_scheme                        *240.1 GB   disk2
1:                        EFI                         209.7 MB   disk2s1
2:                  Apple_HFS BootB240                239.1 GB   disk2s2
3:                 Apple_Boot Recovery HD             784.2 MB   disk2s3
/dev/disk3
#:                       TYPE NAME                    SIZE       IDENTIFIER
0:                  Apple_HFS fusion                 *1.2 TB     disk3
MPGmini:~ admin$ diskutil info disk1
Device Identifier:        disk1
Device Node:              /dev/disk1
Part of Whole:            disk1
Device / Media Name:      APPLE HDD HTS541010A9E662 Media
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:                 SATA
SMART Status:             Verified
Total Size:               1.0 TB (1000204886016 Bytes) (exactly 1953525168 512-Byte-Blocks)
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:                No
Whole:                    Yes
Internal:                 Yes
Solid State:              No
OS 9 Drivers:             No
Low Level Format:         Not supported
Device Location:          "Lower"
MPGmini:~ admin$ diskutil info disk2
Device Identifier:        disk2
Device Node:              /dev/disk2
Part of Whole:            disk2
Device / Media Name:      OWC Elite Pro mini C Media
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:                 USB
SMART Status:             Not Supported
Total Size:               240.1 GB (240057409536 Bytes) (exactly 468862128 512-Byte-Blocks)
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
MPGmini:~ admin$ diskutil info disk3
Device Identifier:        disk3
Device Node:              /dev/disk3
Part of Whole:            disk3
Device / Media Name:      Internal Drive
Volume Name:              fusion
Escaped with Unicode:     fusion
Mounted:                  Yes
Mount Point:              /Volumes/fusion
Escaped with Unicode:     /Volumes/fusion
File System Personality:  Journaled HFS+
Type (Bundle):            hfs
Name (User Visible):      Mac OS Extended (Journaled)
Journal:                  Journal size 98304 KB at offset 0x23d4000
Owners:                   Enabled
Content (IOContent):      Apple_HFS
OS Can Be Installed:      Yes
Media Type:               Generic
Protocol:                 SATA
SMART Status:             Not Supported
Volume UUID:              9B7715FA-4374-3CFE-ADEC-C85D87C70001
Total Size:               1.2 TB (1230707228672 Bytes) (exactly 2403725056 512-Byte-Blocks)
Volume Free Space:        1.2 TB (1229936910336 Bytes) (exactly 2402220528 512-Byte-Blocks)
Device Block Size:        512 Bytes
Read-Only Media:          No
Read-Only Volume:         No
Ejectable:                No
Whole:                    Yes
Internal:                 Yes
Solid State:              Yes
OS 9 Drivers:             No
Low Level Format:         Not supported
Device Location:          "Upper"
MPGmini:~ admin$ diskutil cs list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 4875561E-2071-42FC-A351-3DF030789DA4
=========================================================
Name:         Internal Drive
Size:         1239574347776 B (1.2 TB)
Free Space:   90112 B (90.1 KB)
|
+-< Physical Volume FE0D41CD-C179-4A1F-9964-AE9B5D5029FF
|   ----------------------------------------------------
|   Index:    0
|   Disk:     disk0s2
|   Status:   Online
|   Size:     239713435648 B (239.7 GB)
|
+-< Physical Volume CBCAF784-FEF1-4FCF-9CE5-7E885375BB70
|   ----------------------------------------------------
|   Index:    1
|   Disk:     disk1s2
|   Status:   Online
|   Size:     999860912128 B (999.9 GB)
|
+-> Logical Volume Family 90F50184-71BB-4A7D-9A8B-9E579A4F6701
----------------------------------------------------------
Encryption Status:       Unlocked
Encryption Type:         None
Conversion Status:       NoConversion
Conversion Direction:    -none-
Has Encrypted Extents:   No
Fully Secure:            No
Passphrase Required:     No
|
+-> Logical Volume 52107A00-4072-4104-AB51-E9F0DB7C3FF7
---------------------------------------------------
Disk:               disk3
Status:             Online
Size (Total):       1230707228672 B (1.2 TB)
Size (Converted):   -none-
Revertible:         No
LV Name:            fusion
Volume Name:        fusion
Content Hint:       Apple_HFS
MPGmini:~ admin$ diskutil cs info FE0D41CD-C179-4A1F-9964-AE9B5D5029FF
Core Storage Properties:
Role:                       Physical Volume (PV)
UUID:                       FE0D41CD-C179-4A1F-9964-AE9B5D5029FF
Parent LVG UUID:            4875561E-2071-42FC-A351-3DF030789DA4
Device Identifier:          disk0s2
PV Size:                    239713435648 B
PV Status:                  Online
MPGmini:~ admin$ diskutil cs info CBCAF784-FEF1-4FCF-9CE5-7E885375BB70
Core Storage Properties:
Role:                       Physical Volume (PV)
UUID:                       CBCAF784-FEF1-4FCF-9CE5-7E885375BB70
Parent LVG UUID:            4875561E-2071-42FC-A351-3DF030789DA4
Device Identifier:          disk1s2
PV Size:                    999860912128 B
PV Status:                  Online
MPGmini:~ admin$ diskutil cs info 90F50184-71BB-4A7D-9A8B-9E579A4F6701
Core Storage Properties:
Role:                       Logical Volume Family (LVF)
UUID:                       90F50184-71BB-4A7D-9A8B-9E579A4F6701
Parent LVG UUID:            4875561E-2071-42FC-A351-3DF030789DA4
LVF Encryption Status:      Unlocked
LVF Encryption Type:        None
MPGmini:~ admin$ diskutil cs info 52107A00-4072-4104-AB51-E9F0DB7C3FF7
Core Storage Properties:
Role:                       Logical Volume (LV)
UUID:                       52107A00-4072-4104-AB51-E9F0DB7C3FF7
Parent LVF UUID:            90F50184-71BB-4A7D-9A8B-9E579A4F6701
Parent LVG UUID:            4875561E-2071-42FC-A351-3DF030789DA4
Device Identifier:          disk3
LV Status:                  Online
Conversion Status:          NoConversion
Content Hint:               Apple_HFS
LV Name:                    fusion
Volume Name:                fusion
LV Size:                    1230707228672 B
Cycling

diglloyd.com | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2008-2015 diglloyd Inc, all rights reserved.