Fusion Drive - How do I add back a partition

[milomak]

I experienced a power failure when I was in Bootcamp. When I rebooted againI noticed I could not boot into Bootcamp. But I could access the Bootcamp partition in in Finder and be able to work on files.

So when I went to Disk Utility, I noticed that it states the size of the Fusion Drive as being just bigger than macOS install and completely disregards the Bootcamp partition

Spoiler

diskutil cs list

CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group DD388015-1FFF-4831-9CF2-9CD8367E2742
    =========================================================
    Name:         iMac
    Status:       Online
    Size:         826852675584 B (826.9 GB)
    Free Space:   749568 B (749.6 KB)
    |
    +-< Physical Volume 1CA5E61B-C026-4CF8-8AF4-B7DF7F5F22D2
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk1s2
    |   Status:   Online
    |   Size:     120338849792 B (120.3 GB)
    |
    +-< Physical Volume 8E14E744-451B-416F-A1BB-381DAE3E02EA
    |   ----------------------------------------------------
    |   Index:    1
    |   Disk:     disk0s2
    |   Status:   Online
    |   Size:     706513825792 B (706.5 GB)
    |
    +-> Logical Volume Family 1D47764C-26B0-4C36-93A7-323A023C19A6
        ----------------------------------------------------------
        Encryption Type:         None
        |
        +-> Logical Volume 94350E47-4BD3-48A2-B9DC-454AACAF0083
            ---------------------------------------------------
            Disk:                  disk2
            Status:                Online
            Size (Total):          821000273920 B (821.0 GB)
            Revertible:            No
            LV Name:               Macintosh HD
            Volume Name:           Macintosh HD
            Content Hint:          Apple_HFS
            LVG Type:              Fusion, Sparse

$ diskutil list

/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *2.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage iMac                    706.5 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
   4:       Microsoft Basic Data BOOTCAMP                1.3 TB     disk0s4

/dev/disk1 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *121.3 GB   disk1
   1:                        EFI EFI                     209.7 MB   disk1s1
   2:          Apple_CoreStorage iMac                    120.3 GB   disk1s2
   3:                 Apple_Boot Boot OS X               134.2 MB   disk1s3
   4:                  Apple_HFS Boot OS X               134.2 MB   disk1s4
   5:           Linux Filesystem boot                    73.4 MB    disk1s5
   6:           Linux Filesystem                         440.4 MB   disk1s6

/dev/disk2 (internal, virtual):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           +821.0 GB   disk2
                                 Logical Volume on disk1s2, disk0s2
                                 94350E47-4BD3-48A2-B9DC-454AACAF0083
                                 Unencrypted Fusion Drive

What command do I need to issue to add the Bootcamp partition back into Fusion Drive?

 

[chscag]

Let me see if I have the disks and sizes straight:

It appears that your Fusion drive (2 TB) consists of a 120 GB SSD plus a HHD of approx 1.8 TB fused together to equal 2 TB.

What might have happened when you experienced the power loss is that the EFI is now corrupt and no longer recognizes the Boot Camp partition. I read of another similiar thread in a different forum than ours where the OP asked Apple for help. They told him to reinstall macOS from Recovery and that would solve the problem. Sounds simple but it did work for that person. Reinstalling from Recovery will not overwrite your data nor destroy the Boot Camp Partition. However, I strongly recommend that you backup both your macOS partition and Boot Camp partition before reinstalling.

Some advice: Buy a good UPS and use it.

 

[milomak]

thanks. let me look in that

 

[milomak]

Let me see if I have the disks and sizes straight:

It appears that your Fusion drive (2 TB) consists of a 120 GB SSD plus a HHD of approx 1.8 TB fused together to equal 2 TB.

What might have happened when you experienced the power loss is that the EFI is now corrupt and no longer recognizes the Boot Camp partition. I read of another similiar thread in a different forum than ours where the OP asked Apple for help. They told him to reinstall macOS from Recovery and that would solve the problem. Sounds simple but it did work for that person. Reinstalling from Recovery will not overwrite your data nor destroy the Boot Camp Partition. However, I strongly recommend that you backup both your macOS partition and Boot Camp partition before reinstalling.

Some advice: Buy a good UPS and use it.

thanks tried the reinstall from macOS Recovery but same issue persists

I also notice that the Bootcamp partition has Type: Unknown

The Macintosh HD partition has Type: CoreStorage Logical Volume

So it seems to me that I need something that will make the Bootcamp partition be seen as a Logical Volume in the Fusion Drive

If anyone is running Bootcamp, could you post your diskutil cs list and diskutil list please

 

[milomak]

This is the solution
https://apple.stackexchange.com/questions/308729/recover-bootcamp-efi-folder-fix-boot-entries

Anyway,the most important thing I was able to boot my BOOTCAMP/Windows partition after it was gone/lost/disappeared from the boot options

 

[chscag]

Looks like you had to do some more work. Anyway, glad you resolved it and thanks for posting the link which should help others.

 

[milomak]

It seems though diskutil (maybe by default?) doesn't pick up the BOOTCAMP partition as part of the logical drive