era_invalidate(8)

okay bestie, let's talk about era_invalidate(8) 🎀✨ it's a System Manager's Manual page, and it's literally the tool you want when you need to know what changed since a certain era 💅

💖 NAME 💖

era_invalidate - Provide a list of blocks that have changed since a particular era. It's giving "show me what's been touched lately" energy 🦋

🌸 SYNOPSIS 🌸

era_invalidate [options] {device|file}

✨ DESCRIPTION ✨

okay so era_invalidate pokes through era metadata and lists the blocks that may have changed since a given era 👀 "may" is doing a lot of work there, so keep that in mind 🙈

⚠️ bestie, this tool cannot be run on live metadata unless you use the --metadata-snap option. Don't skip this one 💀

🎀 OPTIONS 🎀

• -h, --help — shows you the help text and then exits 🧚
• -V, --version — prints the version info and then exits 🌈
• -o {output file} — sends the output to a file instead of stdout 📝
• --metadata-snapshot — uses the metadata snapshot instead of the current superblock 📸
• --written-since {era nr} — lists the blocks written since the era you give it 🦋

🍓 EXAMPLE 🍓

ngl this example is so cute 🥹 it lists the blocks that may have been written since the beginning of era 13 on the metadata device /dev/vg/metadata:

$ era_invalidate --written-since 13 /dev/vg/metadata

and fyi, the device may not be actively used by the target while this is running 👀

💅 DIAGNOSTICS 💅

era_invalidate returns an exit code of 0 for success or 1 for error (eg, metadata corruption) 😭 so if you see a 1, go check your metadata, periodt 💜

🧚 SEE ALSO 🧚

era_check(8), era_dump(8), era_restore(8) 🫶

👑 AUTHOR 👑

Joe Thornber <ejt@redhat.com> 💖

And that's the tea, bestie 🌸 Device Mapper Tools, System Manager's Manual, era_invalidate(8). Go be a main character with your metadata ✨💅🎀