HP VMA-series Memory Arrays Manuel d'utilisateur télécharger pdf (Page 225)

AM456-9007B Rev 02 HP VMA SAN Gateway Installation and User Guide 225

vring

The vring utility debugs the internal HP VMA Array I/O request ring at a low

level, and checks for unaligned flash device access.

Look for the transfer sizes under the column labeled

SIZE. If most of the lines

show

4096, full 4kB accesses are being done to the HP VMA Array hardware,

which is optimal. In an unaligned access case, you will see lines alternate between

512 and 3584 for transfer size, since two read-modify-write operations occur for

each 4kB of data.

Syntax

vring [ -p <partition_name> ]

Completed write I/O's

Displays the total I/O write requests to a HP

VMA Array. This is not the individual DMA

descriptors completed, but for each of the user

requested I/Os.

Unaligned host buf

writes

Displays the total I/O write requests to a HP

VMA Array, but only incremented when an

unaligned host address required special buffer

byte copying to service the DMA request.

Flash partial page

writes

Increments when a DMA descriptor for write

is less than a flash page (4kB) in size, which

leads to a hardware read-modify-write

operation.

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HP VMA-series Memory Arrays Manuel d'utilisateur Page 225