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Archive for November, 2012

Xen 4.2.0 and DRBD

by on Nov.21, 2012, under Software

Now that Xen has deprecated the xm command and xend daemon, libxl is the way to go. However, libxl didn’t support external scripts for your block devices (like block-drbd) before version 4.2.0. Seems like that issue has been resolved, or at least as far as I care for now. However, with these changes I found that the block-drbd script (at least up until DRBD 8.4.2) still doesn’t work properly.

To save you some time debugging this shit, the problem is that the new xl stack forces the device type to be ‘phy‘ when a script is used. In the older versions xm/xend would report ‘drbd‘ to the block-drbd script as device type. Knowing this the fix for now is simple:

--- block-drbd.org 2012-11-21 12:35:08.338180920 +0100
+++ block-drbd 2012-11-21 12:35:33.278642801 +0100
@@ -248,6 +248,8 @@
fi

case $t in
+ phy)
+ ;&
drbd)
drbd_resource=$p
drbd_role="$(/sbin/drbdadm role $drbd_resource)"
@@ -276,6 +278,8 @@

remove)
case $t in
+ phy)
+ ;&
drbd)
p=$(xenstore_read "$XENBUS_PATH/params")
drbd_resource=$p

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Xen 4.2.0 on Slackware64 14.0

by on Nov.20, 2012, under Software

Yay a new Xen version. Well, it’s not that new, but I’m upgrading to it today. And while we’re at it, Jeremy got his pvops kernel almost to version 3.1.0 (it’s at rc9 today, good enough for me atm).
So what’s new in this latest Xen version? First of all it has finally ditched the xm command for good. Well, it’s still there, but it’s really deprecated now because it has been replaced by xl. For a nice overview of what has been improved since Xen 4.0, they have a nice list over here.
One cool thing in the later Xen releases (that is: 4.0 and up) is the integration of Remus. We’ll test that out later. (continue reading…)

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