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Mountain Lion installation on home built Fusion Drive
Authored by: tiptongrange on Nov 07, '12 10:34:35PM

I did this on a 2010 MacBook Pro that has a 340GB hard drive and a 120GB SSD. However, in the last command of Part 1 that begins with: diskutil cs createVolume..., I used 100% as the last argument instead of 500g. This ensures that the entire drives are used. I then did a fresh install of Mountain Lion, but this method won't create a recovery partition. The command 'diskutil list' gives this:


gbh-mbp-3:~ gbh$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *120.0 GB disk0
1: EFI 209.7 MB disk0s1
2: Apple_CoreStorage 119.7 GB disk0s2
3: Apple_Boot Boot OS X 134.2 MB disk0s3
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *320.1 GB disk1
1: EFI 209.7 MB disk1s1
2: Apple_CoreStorage 319.2 GB disk1s2
3: Apple_Boot Boot OS X 650.0 MB disk1s3
/dev/disk2
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS MBP FusionDrive *436.5 GB disk2


The partitions named 'Apple_Boot Boot OS X' don't show under System Preferences > Startup Disk, but FusionDrive does show. However, if I hold the Option key when booting, two hard disk icons labeled FusionDrive show as an option to boot from. When I select each, they both boot from the SSD. So, I'm guessing that the two icons represent the two Apple_Boot Boot OS X partitions, and that they are linked to the logical volume startup, which is located on the SSD--even if the partition on the HDD is selected.



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Mountain Lion installation on home built Fusion Drive
Authored by: finnp on Nov 17, '12 01:13:20PM

Same here, two hard disks with same name when booting with option key. I used 100% as you and installed from an USB stick.
The drive seem to function OK,-but not as blazing fast as I've seen in other tests. After MT install I used migration assistant to get my old account from a Superduper clone, no problems there.
Imac late 2009 2GB HD, samsung 830 256GB in optical bay



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