Core Storage
Core Storage is a volume manager for OS X that was introduced by Apple to OS X Lion. Core Storage is a layer between the disk partition and the file system.[1]
Core Storage is the basis for Apple's Fusion Drive technology,[2] which presents several partitions on multiple drives as a single logical volume. It does this by using Tiered storage, whereby it keeps the most frequently used blocks on the first storage device in the pool, which is by default, an SSD.
Note however that Apple's current implementation is not intended for the traditional roles that LVMs were/are used for. For example, as of now (2014), the pool cannot be expanded as the storage grows, practically LVM's reason d'etre. Also in 10.7, the pool can comprise only a single drive. Core Storage also doesn't support thin provisioning, different RAID levels or resiliency. However, like in Linux, but unlike in Windows, the LVM can be used as the root filesystem, a significant advantage for home users who prefer to have a single volume for the OS and storage.
See also
References
- ^ "OS X Mountain Lion: Core Technologies Overview" (PDF). Apple Inc. June 2012. Retrieved 2013-09-11.
{{cite web}}: Cite has empty unknown parameter:|coauthors=(help) - ^ http://macs.about.com/od/diyguidesprojects/ss/Setting-Up-A-Fusion-Drive-On-Your-Current-Mac_2.htm
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