If a request returns an error and the failover driver decides to retry the request, the current time is compared with the original timestamp information. These restrictions may be acceptable for small configurations but most larger SAN configurations would be severely constrained. When both paths to the storage are enabled, we have a very unreliable cluster. This book contains many real life examples derived from the author’s experience as a Linux system and network administrator, trainer and consultant. For example, there is a very useful IBM Red Book on the DCS that illustrates the initial installation and configuration of dm-multipath, and the specifics of the multipath. Received the Illegal Command error from the storage array. Disk resources if a physical volume has been created on the provided block device using the pvcreate command.

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Different update levels of Linux included and did not include these scsi device handlers during the kernel build, depending on the version. Unsupported Host Adapter Model: To download the RDAC driver, go to:.

Re: [dm-devel] RHEL5 and RDAC/Multipath

Verify the content of the modprobe. Prints the maximum number of targets that can be handled by that host. The following values are possible:. This means that no other non-rdac style storage that is multipath capable can be used. I would multipqth three tips.

The separately installable rdac DRIVER you mention predates the availability of the now-standard in-box dm-multipath functionality. Multilath have now closely reread the DS Storage Manager At least dmmp and kpartx are installed from rpms of the same name on both CentOS and XenServer, which enables me to check installed versions, and on CentOS they are both version 0.


Prints the version of the RDAC driver currently running on the system.

The lsdev utility provides a map of your array LUNs to their Linux block devices. The revised module and radc names are shown in bold text. Use a utility, such as devlabelto create user-defined device names that will map devices based on a unique identifier. Please note that I have tried just using the above multipath. On Linux shutdown, once multipath is shutdown, Linux looses awareness of which paths are active or passive.

Novell are currently looking at the latest batch of log files and going to provide a recommendation, so may multipafh up ditching RDAC.

Using multipath storage devices

The time now is If you prefer to use nsddevices, and live within its limitations, the basic RDAC driver requires little or no additonal processing nultipath be directly used by nsddevices. To use the mppUtil utility, type this command and press enter. What if I change the size of the LUN on the storage array? MPP driver package has been successfully installed on your system. Introduction reac Linux – A Hands on Guide This guide was created as an overview of the Linux Operating System, geared ib new users as an exploration tour and getting started guide, with exercises at the end of each chapter.


Upvote if you found this answer helpful or interesting. Asked by abo dsl. If another path does not exist, a failover takes place. This book contains many real life examples derived from the author’s experience as a Linux system and network administrator, trainer and consultant.

For a driver update, if the system already has a previous entry for RDAC, the system administrator must modify the existing RDAC entry in the boot loader multipqth file. Change the module and initrd names as follows:.

Error trying to determine state of volume. After the server is rebooted, log in and verify the driver stack is properly loaded using the lsmod command. AgFileSystem resources can be automated for example, network file systems.

Sun StorageTek RDAC Multipath Failover Driver for Linux OS

The two are talking different languages and that’s why it’s not working as you’d expect. Open failed on multipayh bus node.

This process continues until the ArrayIoWaitTime limit is reached. When you use nsddevices, the resulting list of NSDs is less-than-optimally ordered.