cache_repair(8)

✨ cache_repair(8) ✨

💖 NAME 💖

okay so cache_repair is the tool that repairs cache binary metadata 🩹 It takes metadata from one device or file and writes the fixed version to another device or file. Bestie, it's giving data rescue 🔥

🎀 SYNOPSIS 🎀

cache_repair [options] -i {device|file} -o {device|file}

🦋 DESCRIPTION 🦋

okay so cache_repair reads binary cache metadata that was made by the matching device-mapper target 📖 It reads from one device or file, repairs it, and then writes it to another device or file. If you write it to a metadata device, the device-mapper target can process it afterwards ✨ The way that this just works, no cap 💅

⚠️ bestie, this tool cannot be run on live metadata. Do NOT try it on metadata that's actively in use 💀

🌸 OPTIONS 🌸

• -h, --help — pulls up the help text and then exits 🙈
• -V, --version — shows you the version info and then exits 🧚
• -i, --input {device|file} — the input file or device that holds the binary metadata 📥
• -o, --output {device|file} — the output file or device where the repaired binary metadata goes 📤

okay this part is important so listen up 👑 If the output is a file, it has to be preallocated and big enough to hold the metadata 🫶

🍓 EXAMPLE 🍓

Okay so this one reads the binary cache metadata from the file metadata, repairs it, and writes it to the logical volume /dev/vg/metadata so the device-mapper target can pick it up for further processing. It's giving main character energy 🎬

$ cache_repair -i metadata -o /dev/vg/metadata

🌈 DIAGNOSTICS 🌈

cache_repair returns an exit code of 0 for success or 1 for error. So 0 means slay and 1 means something went sideways 😭

🔮 SEE ALSO 🔮

cache_dump(8), cache_check(8), cache_restore(8) — these are your bestie tools, go check them out 🫶

👩‍💻 AUTHOR 👩‍💻

Joe Thornber <ejt@redhat.com>, Heinz Mauelshagen <HeinzM@RedHat.com> — the legends who made this happen 💜

🧚 Sign-off: this is from the System Manager's Manual, Device Mapper Tools section, for cache_repair(8). Iykyk, and now you know 💖✨