Yosemite "problem resizing Core Storage" upgrade error?

The Same....:(

MacBook Pro 2,3Ghz Intel Core i5

8GB 1600Mhz DDR3

Festplattenkapazität : noch über 200GB frei...

I also have the exact same problem...27inch mac.

I have the same problem with MacBook Pro (Early 2011) with HDD & SSD as Fusion Drive.

I think the problem is the recovery partion, it is not here?!

fjd:~ fjd$ diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *240.1 GB disk0

1: EFI 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 *640.1 GB disk1

1: EFI EFI 209.7 MB disk1s1

2: Apple_CoreStorage 639.3 GB disk1s2

3: Apple_Boot Boot OS X 650.0 MB disk1s3

/dev/disk2

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS FusionDrive *871.9 GB disk2

Logical Volume on disk0s2, disk1s2

11DFE616-72CD-46BC-A3F5-5E2F533F6CB7

Unlocked Encrypted Fusion Drive

I have exactly the same with iMac late 2012 (2.9GHz Core i5 8GB 1600mhz ddr3).

Gave up, don't wanna waste more time. Mavericks works fine for me anyway.

Lucky you,aaaaa87 - I tried but no such luck for me: it hangs on the '18 minutes' message and then the usual.

Anyone else?

The problem is the Fusion Drive.

After some experimentation it was found that the installer of Yosemite is not able to delete the recovery partition of Mavericks correctly. It remains after installation of Yosemite and disturbs the other processes. The self-created Fusion Drive is thus useless for further use under Yosemite and also fails to return to Mavericks.

So ...

Yosemite bootable on USB stick or SD card copy (instructions in the network).

Of Stick or SD card boot - but not install anything. Now stand including the terminal and disk utility available without an operating system to be loaded. This constellation is important for subsequent work on the Fusion Drive.

Calling terminal.

Fusion Drive on the command line first unravel again in SSD and magnetic disk (instructions in the network).

Deleting both drives separately by disk utility and format. It may only have a single partition each remain left, everything else must be completely gone.

Create new Fusion Drive on the command line of the terminal by SSD and magnetic disk are joined again (instructions in the network).

Start installation of Yosemite on the new Fusion Drive.

The installation starts now relatively fast and is completed in no longer than 30 min. - As with all previous versions also. In general, the time required is a good indication that everything runs as it should.

The return migration of 1.5 TB of data via Time Machine should be via USB 2.0 through in 2-3 hours, then everything is okay.

Reboot and lo and behold - all fast and fresh.

This should also work with a factory Fusion Drive.

Thank you Rammstein1977, this looks very complete and detailed. Hope it works for those who can work at this level.

But, sorry, for an average user like myself not do-able. I have never even heard of Fusion Drive.

So I wait till Apple solves this for me and meanwhile stick with Mavericks.

http://de.wikipedia.org/wiki/Fusion_Drive

Fusion Drive is a technology developed by Apple Computer Engineering, with a SSD and a mechanical hard drive be connected to a logical drive. [1]

Description and function [Edit]

Fusion Drive called Apple a technique in which an SSD and a mechanical hard disk are transparently connected to a logical drive. The user sees the combination as a single drive. [2] With Fusion Drive is also in large storage volume can be benefited at a moderate price of the speed of the SSD.

Fusion Drive connects not only two physical drives into one logical, but still used in addition to a technology that tiering is called. When tiering, in German as "staggering", data on frequently accessed, the fastest drive (SSD here) saved, the other to the slower, here on the mechanical drive. What data is stored where, the operating system decides on the basis of a thorough analysis of the data access itself and can not be influenced by the user. Optionally coated the operating system in the background to data. The operating system itself is always on the SSD. [3] [4] tiering is used in mainframe computers for some time, with Fusion Drive this technology now comes for the first time in a personal computer for use.

Fusion Drive must not be confused with conventional hybrid drives. While in the latter case the SSD part only serves as a data buffer and all data is ultimately always stored on the mechanical disk in Fusion Drive SSD is a full-fledged part of the logical drive (except a small part of 4 GB [3], which also serves as a buffer).

Fusion Drive is since November 2012 integrated with all new Macs with SSD and mechanical hard drive. [5] The first corresponding Macs were equipped with a 128 GB SSD and a 1 TB or 3 TB of mechanical hard disk. [6] Currently (April 2013 ), Apple provides no utility available with which Fusion Drive install on older Macs could. But this can be done via the terminal, this requirement is OS X 10.8 Lion Mountain. [7]

I had the same problem on my 21.5 inch iMac and this solution worked perfectly. Not sure what the issue was but downloading the installer (both downloaded today) fixed it.

I do not understand . What have you downloaded ?