HP VMA-series Memory Arrays Manual do Utilizador descarregar pdf (Página 159)

Violin Utilities Reference

HP-AM456-9002A Rev 01

VMA-series Memory Array Installation and Service Guide

159

vring

The vring utility debugs the internal Memory 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 Memory 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

Memory 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

Memory 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 Manual do Utilizador Página 159