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To Verify Anypoint Private Cloud Disk Device Requirements

This topic provides information about how to verify that you system meets the minimum prerequisites to install and run the Anypoint Platform Private Cloud Edition.

Installing Logical Volume Manager 2 (LVM2)

To install and run Anypoint Platform Private Cloud Edition, you must install and use LVM2. LVM2 is a tool that adds a layer of abstraction between your operating system and the disks/partitions it uses. You must have root access to install LVM2.

Only LVM2 versions 2.02.166-1.el7_3.5 and earlier are supported. Later versions of LVM2 are not supported.

You can install LVM using Yum. Yum is an open-source command-line package-management utility for Linux operating systems using the RPM Package Manager. Using Yum, you can install LVM through the following command:

sudo yum install lvm2

Verifying Disk Performance

To measure disk throughput, use a tool such as hdparm. On CentOS, hdparm can be installed by running

sudo yum install -y hdparm

Testing Disk Throughput

All disks should have at least 300 MB/sec of throughput. Use the following command to verify the throughput of your disk:

sudo hdparm -d <device>

For example:

$ sudo hdparm -t /dev/sdd

/dev/sdd:
Timing buffered disk reads: 4726 MB in  3.00 seconds = 1574.94 MB/sec

You can also measure throughput using the dd tool. dd writes directly to the specified file, even if it is a device. Do not use this tool on a bare devices. Instead, after a device is formatted and mounted, you can write to a file on that device to measure throughput.

$ sudo mount /dev/sdb /var/lib/gravity # must be already formatted!
$ sudo dd if=/dev/zero of=/var/lib/gravity/testfile count=1000 bs=1M
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 0.382535 s, 2.7 GB/s

The dd command provides less accurate information than hdparm, but is available on any operating system and provides the ability to easily verify general disk performance.

Testing Disk IOPS

Depending on your hardware or virtualization provider, you may be able to configure disk IOPS (I/O Operations Per Second). Using a tool like iops, you can verify available IOPS:

$ sudo ./iops --time 2 /dev/xvdb
/dev/xvdb, 107.37 GB, 32 threads:
 512   B blocks: 1893.0 IO/s, 946.5 KiB/s (  7.8 Mbit/s)
   1 KiB blocks: 1354.8 IO/s,   1.3 MiB/s ( 11.1 Mbit/s)
   2 KiB blocks: 1091.8 IO/s,   2.1 MiB/s ( 17.9 Mbit/s)
   4 KiB blocks:  807.1 IO/s,   3.2 MiB/s ( 26.4 Mbit/s)
   8 KiB blocks:  803.7 IO/s,   6.3 MiB/s ( 52.7 Mbit/s)
  16 KiB blocks:  787.4 IO/s,  12.3 MiB/s (103.2 Mbit/s)
  32 KiB blocks:  700.8 IO/s,  21.9 MiB/s (183.7 Mbit/s)
  64 KiB blocks:  590.0 IO/s,  36.9 MiB/s (309.3 Mbit/s)
 128 KiB blocks:  327.6 IO/s,  40.9 MiB/s (343.5 Mbit/s)
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