Charlie Chiang's blog

In Minimal Alpine Linux on a 1 GB Btrfs Root Disk I wrote down the recipe I use to build a tiny Alpine instance: boot the ISO in a VM, run setup-alpine with disk=none, partition by hand, setup-disk -m sys /mnt, reboot, then qemu-img convert the disk.

I like audio analyzers.

I ordered an OVHcloud Kimsufi KS-5 dedicated server for 19.90 USD/month.

I sometimes need a tiny cloud instance that only forwards traffic.

I recently tried to build QEMU on macOS and make the result portable enough that it could still run after uninstalling the Homebrew packages used during the build, or I can move the whole QEMU directory to another machine.

背景 最近老家重建，家里需要重新布置无线网络。

To install ZeroTier, one would typically allow port 9993/UDP on their firewall.

Introduction Most schools and universities in China have a limited number of GPU servers (often only one or two, or even none).

启用 SSH 没SSH就别想着用Terminal了，赶紧去开了。

If you want see the test results directly, please jump to the Test the unlocked performance section.

Stripe Size When you create an hardware RAID array, you must encountered the term stripe size.

Background Consider a small lab, students need to use GPU for their projects.

Background One particular issue that I encountered when I tried to install some software using Homebrew on my Mac is that Homebrew deprecates support for older macOS versions just like Apple do.

Background We want to test some sandbox application on our new cluster.

Background The RDMA NIC names (InfiniBand HCAs in this case) of our nodes are inconsistent.

So I decided to test NFS over RDMA somehow.

10G ConnectX-4 Lx NICs can be flashed to 25G with the right firmware.

We have a 200Gbps InfiniBand network among about 100 nodes, connected using NVIDIA ConnectX-7 NICs (HDR200) to a NVIDIA MQM9700 switch.

Note Note that this blog currently acts as a reference for me.

前言 由于最近接入了 10Gbps 网络，发现在 PT 做种时，传输速度并没有达到预期的速度，于是优化了一波。

Recent Update: One month later, after we opened our issue #10264, it turns out that the gVisor developers are also aware of tha lacking of documentation about the systemd-cgroup option.

Introduction Re-encoded BD anime series are my go-to when watching animes.

Outline: Know ZFS filesystem and Docker’s zfs storage driver How Docker’s zfs driver works and Why it is slow Why we can’t directly use overlayfs on ZFS Why overlayfs don’t accept remote filesystems Why ZFS is identified as a remote filesystem How to actu…