Linux Agent - Error - Replication Driver Missing

{code}An exception occurred during the request. Replication driver missing; Unable to open driver at '/dev/hcp'; No such device or address.{code}

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You can install a kernel module for your running agent by using the 'r1soft-setup' utility, after ensuring that you have the kernel-devel (Redhat/CentOS) or kernel-headers (Debian/Ubuntu) package installed for your current running kernel. There are 3 common types of Redhat based kernel-devel packages that contain the kernel header and source files needed. (kernel-devel, kernel-xen-devel, kernel-PAE-devel) You must match the proper package to your running kernel type.


To find the current running kernel run:
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uname -r

Example:
[root@CloudLinux6 ~]# uname -r

2.6.32-379.1.1.lve1.1.7.6.el6.x86_64

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To find what kernel and kernel-devel packages you have installed on a Redhat based system you can use an RPM query like this: (note: the kernel and kernel-devel package versions must match exactly in order to build the correct CDP Linux Agent kernel driver module)


{code}rpm -qa | grep kernel

Example: (note the 2nd and last line in this output, the kernel and kernel-devel are the exact same version)
[root@CloudLinux6 ~]# rpm -qa | grep kernel

kernel-2.6.32-320.4.1.lve1.1.4.el6.x86_64
kernel-2.6.32-379.1.1.lve1.1.7.6.el6.x86_64
dracut-kernel-004-284.el6_3.noarch
kernel-firmware-2.6.32-379.1.1.lve1.1.7.6.el6.noarch
kernel-2.6.32-231.17.1.lve0.9.16.x86_64
kernel-devel-2.6.32-320.4.1.lve1.1.4.el6.x86_64
kernel-devel-2.6.32-379.1.1.lve1.1.7.6.el6.x86_64
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To force a custom build using your kernel headers and source files (the '--no-binary' option tells the kernel build server to build a custom kernel driver and not search for a pre-built kernel driver):
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r1soft-setup --get-module --no-binary
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After you have successfully acquired a CDP Agent kernel driver you will need to restart the agent to load the module:
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/etc/init.d/cdp-agent restart
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Then you can check that the module is loaded properly with the lsmod command in Linux. [http://linux.die.net/man/8/lsmod |http://linux.die.net/man/8/lsmod]

Example:
[root@CloudLinux6 ~]# lsmod | grep hcpdriver

hcpdriver             602516  4

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Additional information about the kernel module is located at directory listed below.


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/lib/modules/r1soft

Example:
[root@CloudLinux6 ~]# ll /lib/modules/r1soft/
total 3676
-rw-r--r-- 1 root root 1867622 May 14 11:23 hcpdriver-cki-2.6.32-320.4.1.lve1.1.4.el6.x86_64.ko
-rw-r--r-- 1 root root 1890526 Aug 12 10:01 hcpdriver-cki-2.6.32-379.1.1.lve1.1.7.6.el6.x86_64.ko
lrwxrwxrwx 1 root root      73 Aug 12 10:01 hcpdriver.o -> /lib/modules/r1soft/hcpdriver-cki-2.6.32-379.1.1.lve1.1.7.6.el6.x86_64.ko

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{info:title=Note}Note that the hcpdriver.o file has a symbolic link to the real kernel driver file. This symbolic link allows CDP to call the file without needing to know the name of the real kernel driver file as it will change each time the kernel is upgraded and a new CDP Linux Agent kernel driver is built.
\+Example:+ls \-l /lib/modules/r1soft
total 112
1 root root 114618 2011-09-26 12:58 hcpdriver-cki\-*2.6.38-11-server*.ko
1 root root 53 2011-10-10 10:32 hcpdriver.o \-> /lib/modules/r1soft/hcpdriver-cki-2.6.38-11-server.ko
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You can obtain additional information about the kernel modules such as the version that the module is built for by using the modinfo command in Linux.
[http://linux.die.net/man/8/modinfo]

filename: hcpdriver-cki-2.6.38-11-server.ko
version: 4.1.1 build 13785
license: Proprietary
description: Linux Hot Copy Driver
author: Michael Brumlow
depends:
vermagic: 2.6.38-11-server SMP mod_unload modversions
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