EMC Vmax Disk composition, fast policy (important)

The first is the process,

Different kinds of disks (Sata,fc,flah)->disk group->raid->data volume->thin Pool->tdev and Bcvdev (LUNs)

Then look at:

1) Different kinds of disks called disk, which is visible to the physical hard disk, see:

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Con 112 92 represents the number of disk, flag I for disk internal to the arrary, F for FC disk, E and speed is 0 for the EFD type disk, which is often said to have no robotic arm of the solid-state drive, EntERPrise Flash Drive (EFD), also known as Solid State Drive (SSD).

2) These different hard disks form disk group, and Disk group is a member of disk.

3) Each disk after the raid will form the data volume and Two-mirror GK disk, these are real storage data use, data volume can be considered as part of the physical disk, size smaller than disk, such as:

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You can see that the 279140MB has 4 RAID5 volume.

4) Data volume will be composed of Pool,pool members are volume.

5) 13.5GB Tdev and Bcvdev (LUNs) separated from the pool.

The above is the process from disk to LUN formation **********************************

About Fast policy:

Fast policy is an algorithm that is bound on the SG, which functions:

1) The I/O between monitor and host, calculate response time, if I/O is not very frequent, will move the data to the SATA disk, the contrary will be moved to the FC or Flash disk, the mobile process is not visible on the operation side, For example, the LUNs in the SG for a host are 0000 and 1111, and the LUNs are 0000 and 1111 after the move, but the data volume to the other disk.

The LUN is just a pointer, and the mapping relationship that points to the data, LUN, and data volume in disk is the real reflection of where the data is.

EMC Vmax Disk composition, fast policy (important)