Which Remote Access Cards are supported by RHEV.

May 27, 2010 at 1:59 pm (Uncategorized) (, , , )

Here is a handy matrix I found, that shows which Remote Access Card interfaces are supported by RHEL and RHEV

http://kbase.redhat.com/faq/docs/DOC-30003

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Trying to configure Power Management on RHEV?

May 27, 2010 at 1:58 pm (Uncategorized) (, )

Are you trying to configure Power Management on Red Hat Enterprise Virtualization? Does the test keep failing?

Leave the Port menu box empty. The port box is only used with IBM Blade Center.
Here is the KB article that describes this:
http://kbase.redhat.com/faq/docs/DOC-23648

Another KB matrix on fencing:

http://kbase.redhat.com/faq/docs/DOC-30004

Tip:

When using drac6 RAC interface, select: ipmilan.

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Help iSCSI initiator commands for linux.

May 27, 2010 at 1:53 pm (linux, TechTips, Uncategorized) ()

I’ve been doing a lot of work lately with Red Hat Enterprise Virtualization.  The hosts that I am using are currently connecting to the SAN using iSCSI.  However, in the future they will be connecting with Fiber Channel instead.

I find myself having to remember how to use the iSCSI initiator a lot.  Here are some quick notes on how to do the most common tasks.

Discover available targets from a discovery portal

iscsiadm -m discovery -t sendtargets -p ipaddress

Log into a specific target

iscsiadm -m node -T targetname -p ipaddress -l

Log out of a specific target

iscsiadm -m node -T targetname -p ipaddress -u

Display information about a target

iscsiadm -m node -T targetname -p ipaddress

Display statistics about a target

iscsiadm -m node -s -T targetname -p ipaddress

Remove the portal address to receive information or statistics about all targets.

Display list of all current sessions logged in

iscsiadm -m session

View iSCSI database regarding discovery

iscsiadm -m discovery -o show

View iSCSI database regarding targets to log into

iscsiadm -m node -o show

View iSCSI database regarding sessions logged into

iscsiadm -m session -o show

View if the targets are multipathed (MPIO)

multipath -ll

If it is multipathed, you will see output like below (this is an example of two LUNs, both multipathed).  Note that this show the MPIO mode is round-robin:

36000d77100000b117de986015d5d5746 dm-7 FALCON,IPSTOR DISK
[size=20G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
 \_ 12:0:0:0 sdb 8:16  [active][ready]
 \_ 13:0:0:0 sdd 8:48  [active][ready]
36000d771000002767de9860330139e10 dm-8 FALCON,IPSTOR DISK
[size=200G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
 \_ 12:0:0:1 sdc 8:32  [active][ready]
 \_ 13:0:0:1 sde 8:64  [active][ready]

Here is a very helpful article that covers similar commands, etc.
http://kbase.redhat.com/faq/docs/DOC-6388

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