Resolved Error: The requested change in size is too small

[fellipeh]

Hi,

I'll try to shrink my Fusion Drive, using on topic I found here in MacRumors, I'll try this:

diskutil cs resizeStack D89FC684-BC9E-481B-BA27-AECBB3B3974A 189D7950-175A-4900-8AE7-1C300D24A3C3 873.2G jhfs+ Media 120G
[/code']

My diskutils cs list :

[code]
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group BFD6B1B0-99B4-4FA4-8979-8F1A6A1958A1
    =========================================================
    Name:         fellipeh
    Status:       Online
    Size:         876988317696 B (877.0 GB)
    Free Space:   0 B (0 B)
    |
    +-< Physical Volume 53E977BD-5282-4073-AA3E-E09D897E774B
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk0s2
    |   Status:   Online
    |   Size:     127691702272 B (127.7 GB)
    |
    +-< Physical Volume 189D7950-175A-4900-8AE7-1C300D24A3C3
    |   ----------------------------------------------------
    |   Index:    1
    |   Disk:     disk1s2
    |   Status:   Online
    |   Size:     749296615424 B (749.3 GB)
    |
    +-> Logical Volume Family 7E382C72-3869-4C5A-8865-DC24E3601E69
        ----------------------------------------------------------
        Encryption Status:       Unlocked
        Encryption Type:         None
        Conversion Status:       NoConversion
        Conversion Direction:    -none-
        Has Encrypted Extents:   No
        Fully Secure:            No
        Passphrase Required:     No
        |
        +-> Logical Volume D89FC684-BC9E-481B-BA27-AECBB3B3974A
            ---------------------------------------------------
            Disk:               disk2
            Status:             Online
            Size (Total):       873238216704 B (873.2 GB)
            Size (Converted):   -none-
            Revertible:         No
            LV Name:            Macintosh HD
            Volume Name:        Macintosh HD
            Content Hint:       Apple_HFS

but, when I'll try the command, this error appears:

Started CoreStorage operation
Checking prerequisites for resizing Logical-Physical volume stack
Error: -69742: The requested change in size is too small

How can I shrink my HDD space used by FusionDrive?

Thanks!

 

[sarthak]

Are you on an iMac or Mac Pro or are you using an SSD in Optical Bay + HDD in Sata on a MacBook Pro?

 

[fellipeh]

Are you on an iMac or Mac Pro or are you using an SSD in Optical Bay + HDD in Sata on a MacBook Pro?

I'm on MacBook Pro8,1 and using SSd in original HD place, and original HD in Optical Bay.

 

[sarthak]

I'm on MacBook Pro8,1 and using SSd in original HD place, and original HD in Optical Bay.

You should try these commands, you did not specify a size that's why it gave you an error. They take a while to complete and it may seem the machine has frozen but it's still working.

This will reduce the size of the fusion drive by 256GB.
In simple terms "disk utility" "storage service" "action is to resize volume" "Specified disk is the ID for the fusion drive" "the new size of the fusion drive, in this case 617gb which is 256gb less than before"

diskutil corestorage resizeVolume D89FC684-BC9E-481B-BA27-AECBB3B3974A 617g

This will reduce the size of the HDD space allocated by 256GB.
In simple terms "disk utility" "storage service" "action is to resize the disk" "specified disk ID is for the 750gb HDD" "the new size of the HDD will be 493gb, which is 256gb less than before"

diskutil corestorage resizeDisk 189D7950-175A-4900-8AE7-1C300D24A3C3 493g

This will reduce size of the fusion drive by 256gb and then reduce the hard drive size by 256gb. That means you will have 256gb of unallocated space which you can use for Boot Camp or anything else you want. Feel free to adjust the sizes by what you want.

 

[fellipeh]

Thanks mseth,

But, when I try to use:
diskutil corestorage resizeDisk 189D7950-175A-4900-8AE7-1C300D24A3C3 493g

this error appears:

Error: -69720: There is not enough free space in the Core Storage Logical Volume Group for this operation

here is my new diskutil cs list after the first command:

CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group BFD6B1B0-99B4-4FA4-8979-8F1A6A1958A1
    =========================================================
    Name:         fellipeh
    Status:       Online
    Size:         876988317696 B (877.0 GB)
    Free Space:   96211804160 B (96.2 GB)
    |
    +-< Physical Volume 53E977BD-5282-4073-AA3E-E09D897E774B
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk1s2
    |   Status:   Online
    |   Size:     127691702272 B (127.7 GB)
    |
    +-< Physical Volume 189D7950-175A-4900-8AE7-1C300D24A3C3
    |   ----------------------------------------------------
    |   Index:    1
    |   Disk:     disk0s2
    |   Status:   Online
    |   Size:     749296615424 B (749.3 GB)
    |
    +-> Logical Volume Family 7E382C72-3869-4C5A-8865-DC24E3601E69
        ----------------------------------------------------------
        Encryption Status:       Unlocked
        Encryption Type:         None
        Conversion Status:       NoConversion
        Conversion Direction:    -none-
        Has Encrypted Extents:   No
        Fully Secure:            No
        Passphrase Required:     No
        |
        +-> Logical Volume D89FC684-BC9E-481B-BA27-AECBB3B3974A
            ---------------------------------------------------
            Disk:               disk2
            Status:             Online
            Size (Total):       772999999488 B (773.0 GB)
            Size (Converted):   -none-
            Revertible:         No
            LV Name:            Macintosh HD
            Volume Name:        Macintosh HD
            Content Hint:       Apple_HFS

 

[fellipeh]

Sorry... my mistake.. I made error in my calc!
works fine with correct number in space..

Thanks!