Tips

ZFS is one of my favorite file systems. I use it at home on my nas server (running FreeBSD) as well as my Fedora 32 desktop. Today, I’m going to show you (and my future self) how to replace a (faulty) disk in a Zpool. The server I’ll be working on is nas2 and the pool is tank. List the status of the current pool. Password: root@nas2:~ # zpool status tank pool: tank state: DEGRADED status: One or more devices could not be opened. Sufficient replicas exist for the pool to continue functioning in a degraded state. action: Attach the missing device and online it using 'zpool online'. see: http://illumos.org/msg/ZFS-8000-2Q scan: resilvered 472K in 0 days 00:00:02 with 0 errors on Sun Aug 23 16:17:21 2020 config: NAME STATE READ WRITE CKSUM tank DEGRADED 0 0 0 mirror-0 DEGRADED 0 0 0 diskid/DISK-Z4Z46MXG ONLINE 0 0 0 620907994788427922 UNAVAIL 0 0 0 was /dev/diskid/DISK-Z1E4ZCM2 mirror-1 ONLINE 0 0 0 diskid/DISK-Z1E5PFCH ONLINE 0 0 0 diskid/DISK-Z4Z46XQP ONLINE 0 0 0 errors: No known data errors From the above output, we can see that one of the disk in mirro-0 vdev was missing. (In fact, it has been removed prior to the system rebooted. I also inserted a new disk to the system.) ...

Just a few a days ago, I wrote a blog post about Pairing Bluetooth Mouse on Command Line on a Fedora laptop. So why do I need to write another post about doing the same thing on Gentoo? Well, as it turned out, I need a bit more than just turning on the bluetooth service and pairing the mouse. My Gentoo’s installation is very minimal, and I think this gives me an excuse to document on how I’d solve or get this working on Gentoo. ...

One of my virtual machines runs out of disk space in the root (/) partition, and I want to remove the /home partition and using this free space to resize the root partition. Nowadays, for any serious systems, I’d use LVM with XFS on top. However, for this test VM, I have a virtual disk with 4 partitions without LVM. Managing partition on LVM is much easier than working the disk partition directly. I can’t remember the last time I had to do this, so here is something to remind my future-self if I need this information again. Hey, if you’re reading this now, this might be useful to you too. ...

Ever since I’ve switched from Gnome to DWM on my main laptop, I have to perform most things on command line now. I know, right? :P Anyway, I need to pair a bluetooth mouse, Logi MX Anywhere 2S, with this Fedora laptop. I had a similar post a while back about connecting Bose QC35 to Fedora 29. So this is quite similar to that post. First, ensure that bluetooth.service is running: ...

On Fedora or CentOS, on way to find out what package providing a file we can use yum whatprovides [FILENAME] or dnf whatprovides [FILENAME] on a DNF-aware system. # dnf whatprovides tmux Last metadata expiration check: 2:33:06 ago on Wed 09 Sep 2020 09:45:07 PM AEST. tmux-3.0a-2.fc32.x86_64 : A terminal multiplexer Repo : @System Matched from: Provide : tmux = 3.0a-2.fc32 tmux-3.0a-2.fc32.x86_64 : A terminal multiplexer Repo : fedora Matched from: Provide : tmux = 3.0a-2.fc32 I really need this similar tool on Gentoo, and it looks like the emerge command doesn’t have this function built it. Fortunately, there is a utility called e-file (provided by pfl package) which kinda provides this whatprovides option as in yum and dnf. ...