USP/USP-V Basic Architecture
Definitons
- DKC - Disk controller, can also hold 128 drives in a USP-V
- DKU - Disk expansion unit, holds 256 drives in a USP-V
- CHA - Channel adapters, cache to host, contain host ports
- DKA - Disk adapters, cache to disk, connec to back end drives
- CSW - Cache switch, controls movement from cache to hosts and drives
This can be represented as follows:
USP-V CSW
CSW + 1D/2P controls CHA0+1 and DKA0+1. If additional CHAs/DKAs are added, an additional CSW is required at 1J/2V
The USP-V is split into Cluster 1 (front) and Cluster 2 (back). These contain 16 or 8 port CHAs. The port numbers are as follows:
CL1 | CL1 | CL2 |
---|---|---|
CHA0 | CHA1 | |
1A 3A | 1E 3E | 2A 4A |
5A 7A | 5E 7E | 6A 8A |
1B 3B | etc | etc |
5B 7B | ||
1C 3C | ||
5C 7C | ||
1D 3D | ||
5D 7D | ||
(odd numbers) | (even numbers) |
A 16 port CHA has 8 processors, CHP00 controls 1A & 5A, CHP01 3A & 7A, etc
Queue depths
USP-V | USP |
---|---|
1024 queued commands per port | 512 |
32 queued commands per LUN | 32 |
So if a SCSI queue depth on a server (sd_max_throttle on Solaris) is set to 32, the maximum recommended LUNs per port will be 32 (32 x 32 = 1024)
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