HP VMA-series Memory Arrays Manual do Utilizador descarregar pdf (Página 177)

Network-Layer Performance Testing

HP-AM456-9002A Rev 01

VMA-series Memory Array Installation and Service Guide

177

• Random reads at 4kB block size:(-R) (-b 4096)

•Sustained random writes at 4kB block size: (-R) (-w1)(-r0) (-b 4096)

• Random reads and writes at mix & the expected block size (given the

application and file system): (-R) (-w1)(-r1) (-b)

Each of these tests should be run using asynchronous I/O settings (-A) and a

range (-t) of thread counts (for example, 1- 64).

The baselines established using

perf_test may enable you to identify

performance issues at the operating system-layer, file system-layer, or database-

layer of the Memory Array system.

Testing Read Bandwidth

By default, the

perf_test accesses the first Memory Array device using a

single thread for a repeated 4kB read of sector 0.

The following example shows a command that uses the (

-s), (-R), (-b), (-d), and

(

-p) options to check the read bandwidth of the Memory Array.

The example shows that the read bandwidth is roughly 1.2 GB/s, which is what

you might expect on a PCIe bus with the payload set to the lowest setting of 128-

bytes.

Testing Write Bandwidth

To check the write bandwidth, use the

-w and -r options to define the ratio of

writes to reads at 1:0. This ratio enables you to determine the random percent

of 1/Os that are writes.

# perf_test -s 384 -R -t4 -b 16384 -d5 -p /dev/rdsk/vtms2v1

Running with options:

threads = 4

block_size = 16384

memory size = 393216 MB

memory start addr = 0 MB

write:read ratio = 0:1

random mode = 1

duration = 5 secs

path = /dev/rdsk/vtms2v1

MB = 1000000 bytes

Time (sec) Read BW Write BW Total BW Read IOPS Write IOPS Total IOPS

1 1259.292 MB/s 0.000 MB/s 1259.292 MB/s 76861 0 76861

2 1258.271 MB/s 0.000 MB/s 1258.271 MB/s 76798 0 76798

3 1259.717 MB/s 0.000 MB/s 1259.717 MB/s 76887 0 76887

4 1258.863 MB/s 0.000 MB/s 1258.863 MB/s 76834 0 76834

5 1258.300 MB/s 0.000 MB/s 1258.300 MB/s 76800 0 76800

Average 1258.889 MB/s 0.000 MB/s 1258.889 MB/s 76836 0 76836

1 2 ... 172 173 174 175 176 177 178 179 180 181 182 ... 299 300

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