Hi, I have an MSA whose capacity is almost full, but i cant understand what the unallocated means, considering my uncommitted space is 0. KIndly clarify.
I got this explanation from a forum, but still cant understand the unallocated and allocated being more than the total of pool B
- For virtual storage: (With virtual you create a bunch of disks as a pool and all LUNs inside use all available disks on their LUN specific RAID level (just like the EVA / P6000 disk array did) - so as an example even a 2 disk mirror may use 10 disks - so it is much faster and the I/O does not hit only 2 disks while other disks are idle - more reliability, more performance.)
Allocated space is the amount of space that the data written to the pools takes.
• Unallocated space is space that is designated for a pool but has not yet been allocated by a volume within that pool.
• Uncommitted space is the overall space minus the allocated and unallocated space.
- For linear storage: ("linear" is the old style used by the G1 to G3 model already. You create a vdisk on a number of disks, let's say 5 disks for a RAID5 and create LUNs within. Then another vdisk ... and so on. The vdisks already set the RAID level for all LUNs inside.)
Allocated space is the space designated for all volumes. (When a linear volume is created, space equivalent to the
volume size is reserved for it. This is not the case for virtual volumes.)
• Unallocated space is the difference between the overall and allocated space.