Computers

http://boisvert.info/computer-hardware.html

Comments

Post a Comment

Popular posts from this blog

Changing the capacity of each VDEV in a ZPOOL without losing data and no downtime with ZFS

Before we start, let's define some acronyms. FreeBSD: Free B erkeley S oftware D istribution ZFS: Z ettabyte F ile S ystem ZPOOL: Z FS POOL DEV: DEV ice VDEV: V irtual DEV ice GEOM: disk GEOM etry BHYVE: B SD HY per V isor ZVOL: Z FS VOL ume *** I have been tinkering with FreeBSD, ZFS, GEOM, BHYVE, and other interesting technologies. *** Let's experiment on how to change the capacity of each VDEV of a ZPOOL without losing data and no downtime with ZFS. To do so, you need a set of disks that are bigger. Example, if the ZPOOL has 2 mirror VDEVs with 2 10GB disks each (total: 4 10GB disks), and you want to upgrade to 20 GB disks, than you need 4 20GB disks for the upgrade. Figure 1: Live upgrade of disks in a ZPOOL ZPOOL tank                           ZPOOL tank     VDEV mirror-0                        VDEV mirror-0         DEV /dev/vtbd1                    DEV /dev/vtbd9         DEV /dev/vtbd2    --->          DEV /dev/vtbd10     VDEV mirror-1
Read more

My Bodyweight Fitness workout routine (October 2020 Update)

 Hello, I bought rings. So my routine changed. I leveled up in two exercises: Regular Push-Ups 3x15 ----> Ring Push-Ups 3x8 Dips 3x12 ----> Ring Dips 3x5 My new complete routine, with the basic hierarchy based on the book  " Overcoming Gravity ": Duration: Takes around 2h30 Frequency: 3 times / week Goals 1 strict pull-up Better wrist mobility  Warm-up Blood flow Deep squats 3x15 Mobility Wrist circles 15x Shoulder circles 15x Positional drills Plank 1x60s Reverse plank 1x60s Left side plank 1x30s Right side plank 1x30s Hollow Hold 1x60s Arch Hold 1x60s Skill work Ring support hold:  3x60s Wall handstand: 3x60s Strength work Pull Ring Eccentric Pull-ups 3x5 Ring Rows 3x8 Leg-Assisted Tuck L-sit 3x60s Push Ring Dips 3x5 Ring Push-Ups 3x8 Leg-Assisted Tuck Planche 3x60s Legs Ring-Assisted Pistols 3x8 Lunges 3x10 Prehabilitation work, Flexibility work Wrist flexibility  
Read more

Adding ZVOL VIRTIO disks to a guest running on a host with the FreeBSD BHYVE hypervisor

On atlantis.domain (my FreeBSD BHYVE hypervisor host), I use these commands: Install FreeBSD on a 10G disk. vm create -s 10G guestname   vm install FreeBSD-12.1-RELEASE-amd64-memstick.img vm console guestname Add 8 30GB zvol-based disks vm add -d disk -t zvol -s 30G guestname vm add -d disk -t zvol -s 30G guestname vm add -d disk -t zvol -s 30G guestname vm add -d disk -t zvol -s 30G guestname vm add -d disk -t zvol -s 30G guestname vm add -d disk -t zvol -s 30G guestname vm add -d disk -t zvol -s 30G guestname vm add -d disk -t zvol -s 30G guestname You will need to do vm poweroff guestname vm start guestname because the guest does not seem to see the 8 30GB without power cycling. (rebooting won't work) *** If you want the boot disk (the one create by "vm create") to be a zvol, you must edit the template: root@atlantis:~ # zfs snapshot tank/vm-bhyve@2020-06-11-2145 root@atlantis:~ # mount -t zfs tank/vm-bhyve@2020-06-11-2145 /tank/vm-bhyve@2020-06-11-2145 r
Read more