One of the issues that I have run into in the past when working with iscsi disks occurs when a host (initiator) is unable to logout gracefully from an iscsi disk when attempting to shutdown or reboot a host. Note that this is a known issue and is documented here and here. I have not read completely through the RHEL 6 Bugzilla to see if the issue has been resolved, however I can tell you that I have seen this issue in RHEL 6.2.
reboot
Poor Man’s eSATA Drive Hot Swap without AHCI or Hotplug Support Under Linux
Unfortunately, hot-swapping an eSATA drive is a bit more complicated than hot swapping a USB drive.
First off, your BIOS needs to support AHCI (click here for more info on AHCI), and your SATA controller also needs to support it as well. Secondly your OS, needs to specifically support hot plug, and in the case of Windows 7, it wont boot if you change to AHCI after the OS has been installed.
Patching ESXi 4.1 via the Linux RCLI
Great Balls of Frustration... could the documentation be anymore confusing and convoluted regarding the process of patching an ESX server via the Linux remote cli.
No, I am not running windows, and no I am not on the local ESX console, and no I am not running the Vmware Management Appliance, and most of all, no I do not want outdated instructions from 2008. I just want to download some patches to my local linux destop and patch my ESX servers. Specifically I want to install the latest and greatest Qlogic drivers to troubleshoot a SAN connectivity issue that I will probably blog about at a later date.
Anyway here is how I did what I needed to do without resorting to using a windows box.
Add a New Disk/Lun to RHEL5/CentOS5 without Rebooting
Anyway the command below causes a rescan of the scsi bus which is what you need to do for your server to detect a newly added disk. I find myself doing this on virtual machines all the time. Oh and for the love of all that is holy, please create your new disk a logical volume, and dont be lazy and just format the disk and stick a filesystem on it.