Upgrade to High Sierra

When I try to do the High Sierra installation my hard drive is greyed out and the only option is to choose "back", as seen in the screenshot provided.  Macbook Pro is from mid 2012, I'm running Yosemite 10.10.5, start up disk is SSD Raid and has 936 Gb free space on it. Any help would be appreciated.


Screen Shot 2018-02-03 at 10.18.44 PM.png

MacBook Pro (13-inch Mid 2012)
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In my opinion, RAIDs should never be used for a boot or startup drive. They are primarily used for faster data storage. I use one for my backup drive but I use a mirrored RAID for redundancy protection. I recommend making a bootable backup on another drive, removing the RAID setup and cloning the bootable backup to one of the RAID's drive and repurposing the other for added storage or for backup. You could also repurpose the RAID for backup by converting it to a mirrored array.


RAID Basics


For basic definitions and discussion of what a RAID is and the different types of RAIDs see RAIDs.  Additional discussions plus advantages and disadvantages of RAIDs and different RAID arrays see:


RAID Tutorial;

RAID Array and Server: Hardware and Service Comparison.


Hardware or Software RAID?


RAID Hardware Vs RAID Software - What is your best option?


RAID is a method of combining multiple disk drives into a single entity in order to improve the overall performance and reliability of your system. The different options for combining the disks are referred to as RAID levels. There are several different levels of RAID available depending on the needs of your system. One of the options available to you is whether you should use a Hardware RAID solution or a Software RAID solution.


RAID Hardware is always a disk controller to which you can cable up the disk drives. RAID Software is a set of kernel modules coupled together with management utilities that implement RAID in Software and require no additional hardware.


Pros and cons Software RAID is more flexible than Hardware RAID. Software RAID is also considerably less expensive. On the other hand, a Software RAID system requires more CPU cycles and power to run well than a comparable Hardware RAID System. Also, because Software RAID operates on a partition by partition basis where a number of individual disk partitions are grouped together as opposed to Hardware RAID systems which generally group together entire disk drives, Software RAID tends to be slightly more complicated to run. This is because it has more available configurations and options. An added benefit to the slightly more expensive Hardware RAID solution is that many Hardware RAID systems incorporate features that are specialized for optimizing the performance of your system.


For more detailed information on the differences between Software RAID and Hardware RAID, you may want to read: Hardware RAID vs. Software RAID: Which Implementation is Best for my Application?

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