I encountered an intriguing issue recently after replacing my motherboard. Some block devices underwent a change in their order, causing /dev/sda to appear as /dev/sdy due to a modification in the PCI-e enumeration. This change, though seemingly insignificant, led to an unexpected consequence. Since the disk was subject to a specific mdadm filter, its altered…
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…
I have always liked IBM DS series management suite. I have claimed once that your first storage (and with it – your way of thinking about storage abstraction, I assume) is your favorite storage. I have been using the Storage Manager 9 for years now, even before it was 9 (I think that it was…
Linux works perfectly well with multiple storage links using dm-multipath. Not only that, but HP has released their own spawn of dm-multipath, which is optimized (or so claimed, but, anyhow, well configured) to work with EVA and MSA storage devices. This is great, however, what do you do when mapping volume snapshots through dm-multipath? For…
When a company is about to relocate to a new floor or a new building, that is the time when the little piles of dirt swept under the rug come back to hunt you. In several companies I have been to, I have stressed the need of an ordered environment. This is valid to networking…
