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Chapter 10 - Performance Tuning and Troubleshooting
170
system, do so for traditional RAIDs and solid-state drives; that is, 63 sectors per
track.
Two Utilities included in the Violin Utilities package, the
utility, enable you to identify these issues.
vring
This section describes how the Violin Utilities may be used to diagnose 4kB
alignment issues and provides instructions for correcting these problems on
Linux and Windows hosts.
•
Checking Flash 4kB Alignment and Partial Pages
•
Checking Flash 4kB Alignment and Request Ring
•
Addressing 4kB Alignment Issues on Linux Hosts
•
Addressing 4kB Alignment Issues on Windows Hosts
Checking Flash 4kB Alignment and Partial
Pages
The
utility shows the number of read/write I/O requests processed
vpartial
and partial 4kB flash pages.
# vpartial
Violin Memory, Inc.
Version: vtms-linux, <date>
Device:
vtmsa
Index:
0
-- Target Unaligned / Partial Counts --
Completed read I/O's:
Unaligned host buf reads:
Flash partial page reads:
Completed write I/O's:
Unaligned host buf writes: 0
Flash partial page writes: 4535553
For more information on the
Checking Flash 4kB Alignment and Request
Ring
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
VMA-series Memory Array Installation and Service Guide
1995280246
0
10326
1903433508
utility, see
vpartial
vpartial
utility and the
vpartial
on page 170
on page 170
on page 171
on page 171
on page 158.
. If most of the lines
SIZE
HP-AM456-9002A Rev 01
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