Adding a cache disk after installation

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Configuring the Cache > Adding a cache disk after installation

Adding a cache disk after installation

Help | Content Gateway | Version 7.7.3

To add a cache disk, you need to have:

An unformatted physical disk device (created by OS install). Note the size in bytes.

A raw character device (created with mknod)

Adding the device includes mapping the physical disk to the raw character device.

Most of the examples below show commands for an HP DL360 and its RAID controller. (All disks are RAID 0.)

1.	Set up the raw device and modify the permissions:

mknod /etc/udev/devices/raw c 162 0

chmod 600 /etc/udev/devices/raw

2.	Identify the cache disk physical device name and note the size in bytes (used later):

fdisk -l | grep "^Disk"

Disk /dev/cciss/c0d1: 146.7 GB, 146778685440 bytes

3.	Create a node, change the owner of the node, and map that raw node to a physical disk. Note that the final argument increments by 1 for each disk added:

mknod /etc/udev/devices/raw_c0d1 c 162 1 You can change the device name to the name that is returned from the fdisk -l command.

chown Websense /etc/udev/devices/raw_c0d1 Use the device name you used in the mknod statement.

/usr/bin/raw /etc/udev/devices/raw_c0d1 /dev/cciss/c0d1 Use the device name you used in the mknod statement.

4.	To make the changes effective on reboot, add the same /usr/bin/raw commands to /etc/init.d/content_gateway at line 6:

/usr/bin/raw /etc/udev/devices/raw_c0d1 /dev/cciss/c0d1 Use the device name you used in the mknod statement.

5.	Add the devices to /opt/WCG/config/storage.conf using the raw node and the size in blocks returned by fdisk -l:

/etc/udev/devices/raw_c0d1 146778685440
Use the device name you used in the mknod statement.

6.	Verify that caching is enabled. If the installation didn't set up any cache disks, caching will be disabled:

a.	In Content Manager, go to Configure > Protocols > HTTP and click the Cacheability tab.

b.	Under HTTP Caching, select Enabled.

c.	Click Apply and restart Content Gateway.

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Configuring the Cache > Adding a cache disk after installation