I have encountered several methods of doing stateless RedHat Linux systems. Some of them are over-sophisticated, and it doesn’t work. Some of them are too old, and you either have to fix half the scripts, or give up (which I did, BTW), and after long period of attempts, I have found my simple-yet-working-well-enough solution. It…
Well, this is rather common. Network-free seeding is being performed through using a tape device. What happens if you do not have a tape device? We have the poor-man’s huge TB disks (SATA for the people) connected to simple PC systems, but no tape… We perform network-free seeding into disk. There is a utility called…
I have had some work done lately with NetApp SnapMirror. I have snapped-mirrored some volumes and qtrees and I wanted to monitor their use and behavior over the line. As you can expect, site-to-site replication of data is a fragile thing, especially when done on the level of the storage device, which is agnostic to…
Using iSCSI with dm-multipath is rather common setup. With iSCSI running over Ethernet cables, which are too easy to disconnect (either on purpose or by mistake), being cheap and common technology – multipath becomes a must. If you have multiple network links, this is only expected that you use multipath for your iSCSI configuration. It’s…
XenServer is a wonderful tool. One of the better parts of it is its powerful scripting language, powered by the ‘xe’ command. In order to capture a mass of snapshots, you can either do it manually from the GUI, or scripted. The script supplied below will include shell functions to capture Quiesce snapshots, and it…
A friend of mine made a grieve mistake – partition a disk containing Linux LVM directly on it, without any partition table. Oops. When dealing with multi-Tera sized disks, one gets to encounter limitations not known on smaller scales – the 2TB limitation. Normal partition table can contain only around 2TB mapping, meaning that to…
