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Mike Fedyk Below are the 4 most recent journal entries recorded in the "Mike Fedyk" journal:
July 3rd, 2007
02:47 pm

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No program "pvscan" found for your current version of LVM
That's what I get when I run pvscan right after installing the lvm2 package.  It doesn't make sure the lvm kernel modules are loaded before reporting this error.

This command fixes the problem:
/etc/init.d/lvm start
I need to report a bug...

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May 17th, 2007
12:26 pm

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Centos5 LVM disk stats bug filed upstream
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=240476

No response on the list so far, so I'm filing a bug upstream.

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10:06 am

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Vmware server and LVM
I wanted to store my VMs on LVM with each partition on a separate Logical Volume (LV) and the MBR stored in the vmx file.  It looks like I can do this with Xen, but vmware doesn't even allow you to select LVM devices.  I tried putting in a full path, but it just says "Unable to determine the bus type of device /dev/mapper/VolGroup00-base_guest".  This is on a Centos4 host.  Boo vmware.

The nice thing about putting this on LVM is that each LVM LV is treated as a separate drive by the disk accounting subsystem in Linux so that you can see how much activity each VM is generating.  I guess I'll just have to monitor each VM independently... :-/

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May 15th, 2007
06:06 pm

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Linux Disk accounting with LVM Snapshots
I was reading a lot of data from one LVM logical volume and wanted to watch the disk statistics with iostat today. To my surprise, I was seeing the same activity on two logical volumes (LV) and the physical disk containing the two.

A little investigation showed that one LV was a snapshot of the other, and I was reading from one of the snapshots.

While I understand that the two LVs share some common Logical Extents (LE), I believe it is a bug that the disk statistics show activity on both logical volumes.

Should I report this in the centos bugzilla or on upstream's bts?

Thanks,

Mike Fedyk

http://lists.centos.org/pipermail/centos/2007-May/081227.html

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