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HP-AM456-9002A Rev 01
Completed write I/O's
Unaligned host buf
writes
Flash partial page
writes
vring
The
utility debugs the internal Memory Array I/O request ring at a low
vring
level, and checks for unaligned flash device access.
Look for the transfer sizes under the column labeled
show
, full 4kB accesses are being done to the Memory Array hardware,
4096
which is optimal. In an unaligned access case, you will see lines alternate
between
and
512
3584
occur for each 4kB of data.
Syntax
vring [ -p <partition_name> ]
VMA-series Memory Array Installation and Service Guide
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.
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.
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.
for transfer size, since two read-modify-write operations
Violin Utilities Reference
. If most of the lines
SIZE
159
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