You can find bazillion sites explaining Linux LVM, however, I am preparing for my next article, about partition resize for the advanced user, and LVM deep understanding is required, so I have decided to explain some of the internals of LVM for the advanced user. This explains the how it is built more than the…
After major investigations around, I came to the conclusion that a full guide describing the procedure required for online disk resize on Linux (especially – expanding disks). I have created a guide for RHEL5/6/7/8 (works the same for Centos or OEL or ScientificLinux – RHEL-based Linux systems) which takes into account the following four scenarios:…
I am working on an article which will describe the procedures required to extend LUN on Linux storage clients, with and without use of multipath (device-mapper-multipath) and with and without partitioning (I tend to partition storage disks, even when this is not exactly required). Also – it will deal with migration from MBR to GPT…
First, let me state that this is not a desirable action. It can be done, because, as root, there are so many things which are considered “bad practice” you can still do – this is part of what’s ‘root’ is all about – you know what your system needs, and you know how to do…
I have had a system with Oracle ASM diskgroup from which I needed some space. The idea was to release some disk space, reduce the size of existing partitions, add a new partition and use it – all online(!) This is a grocery list of tasks to do, with some explanation integrated into it. Overview…
Modern Kernel specification (can be seen here) defined the initial ramdisk (initrd or initramfs, depends on who you ask) to allow stacking of compressed or uncompressed CPIO archives. It means, in fact, that you can extend your current initramfs by appending a cpio.gz (or cpio) file at the end, containing the additions or changes to…
