Then, close the Host Port Information window. Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. Sounds like a zoning problem possibly. Place the HBA into the Active state by typing the following command: Thanks in advance Al RE: In order to get it working, I had to install the rdac and use the. In my case, dm

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I do know that I have had similar problems on a DS, DS, and a DS where the pathing was correct, however not enough paths were presented.

Collecting system data In preparation for the hot swap procedure, complete the following steps to collect data from the system: Create new PV for dm-5, but not using dm-5 itself. Click Here to join Tek-Tips and talk with other members!

So, any interruption to one of the access path does not affect storage access from the host.

Multipath storage with Xen and DS4800

While virtualization, which reduces server count by increasing utilization efficiency and lowering operating costs, is an excellent solution to the problem of overwhelming demand, it can also add a burden to system availability since more applications are now running in each box.

Using the Storage Manager manually redistribute volumes to preferred paths. Ok, good luck figuring it out. After creating partitions and filesystems on the virtual disks, I get this from within test The guest OS doesn’t need any special driver to have multipath access to the backend rcac.


You are commenting using your Twitter account. We use cookies to ensure that we give you the best experience on our website. In preparation for the hot swap procedure, complete the following steps to collect data from the system:. Figure 1 shows the Xen architecture.

DS4800/RHEL5 multipathing trouble

Verify that disks stay on preferred path by using one or both of the following methods: For each dar that you identified in step 2, type the following command: My solution was to switch to Hyper-V which fixed the issue quite nicely.

The output is similar to the following example: Give it a size and check the option Allocate entire virtual disk now. The Tek-Tips staff will check this out and take appropriate action. For each DS storage subsystem that is affected by the hot swap, complete the following steps to map the worldwide port name WWPN of the HBA to the storage subsystem:.

Each port rdxc connected to a different SAN switch. Correct the problem before continuing. Because the IBM SAN storage servers were designed for multipath access, you don’t need to do anything special to make a logical drive accessible from multiple paths.

Switching From RDAC To MPIO For DSXX00 SAN Array – blog’o thnet

After OS installation, shut down and restart test1, and you should see the two added disks with fdisk -l. Red Flag This Post Please let us know here why this post is inappropriate. For the second guest, I want to map image files in Dom0 as virtual disks to the guest.


In the Enterprise Management window, verify that the storage subsystem s are Optimal. Replace the HBA by following the smit instructions.

To see the new disks, you can run fdisk -l and optionally use fdisk to create partition on them. Do not continue this procedure if two dac s are not reported for each dar. Sorry I couldn’t be of more help. Remember, the multipath driver does not replace the HBA driver: CODE When you upgrade firmware, you must upgrade all client package components to the same release level. It looks like there is a descrepency between the preferred path on the SAN side and the preferred path on the ESX side.

If this occurs, do not continue this procedure until you correct the problem, Loss of data availability can occur.