Interesting Linux VM Crash Pattern
I’ve just begun to pull together some interesting data on a series of Linux VM crashes I’ve seen. I don’t have a resolution yet, but some interesting patterns have emerged.
A CentOS 4.x or 5.x guest will crash with a message similar to the following on its console:
[<f883b299>] .text.lock.scsi_error+0x19/0x34 [scsi_mod]
[<f88c19ce>] mptscsih_io_done+0x5ee/0x608 [mptscsi] (…)
RIP [<ffffffff8014c562>] list_del+0x48/0x71 RSP <ffffffff80425d00> <0>Kernel Panic - not syncing: Fatal exception
A hard reset (i.e. pressing the reset button on the VM’s console) is required to reboot the guest.
VMware’s Comparison of Storage Protocol Performance
VMware has just released a paper entitled Comparison of Storage Protocol Performance (seen at Scale the Mind and blog.scottlowe.org); maybe this will help deflate some of the too-often repeated speculation that NFS is too slow for VMware ESX.