RBD-REPLAY-MANY(8)

💅 rbd-replay-many — the group chat manual page 💅

okay so bestie, this is rbd-replay-many, and it lives in section 8 of the manual (that's the sysadmin/daemon zone, iykyk). It replays a rados block device (RBD) workload on several clients at once, and honestly? it's giving ✨parallel theatre kid✨ energy. Let's get into it.

---

🌸 NAME 🌸

rbd-replay-many — replay a rados block device (RBD) workload on several clients 💖

---

✨ SYNOPSIS ✨

rbd-replay-many [ options ] --original-image name host1 [ host2 [ ... ] ] -- rbd_replay_args

like, options, then the original image name, then a whole lil roster of hosts, then --, then the args you're passing through to rbd_replay. The -- is the vibe check between the two worlds, don't skip it 🫶

---

🦋 DESCRIPTION 🦋

So rbd-replay-many is a utility for replaying a rados block device (RBD) workload on several clients. All the clients use the same workload, but — plot twist — they replay against separate images. That's literally just matching normal use of librbd, where each original client is a VM with its own image. no cap. 🎀

⚠️ Heads up bestie: configuration and replay files are not automatically copied to clients. You gotta do that yourself. Also, replay images must already exist — this tool does not spawn them for you, it's not a miracle worker, it's a replayer. 💀

---

💅 OPTIONS 💅

• --original-image name — Specifies the name (and snap) of the originally traced image. This is necessary for correct name mapping, so like, don't skip it, fr fr. 🌟
• --image-prefix prefix — Prefix of image names to replay against. If you do --image-prefix=foo, clients will replay against foo-0, foo-1, etc. Defaults to the original image name. ✨
• --exec program — Path to the rbd-replay executable. 📍
• --delay seconds — Delay between starting each client. Defaults to 0. (go off, impatient queen) ⏱️

---

🌈 EXAMPLES 🌈

Okay so, typical usage:

rbd-replay-many host-0 host-1 --original-image=image -- -c ceph.conf replay.bin

and this results in the following commands being executed:

ssh host-0 'rbd-replay' --map-image 'image=image-0' -c ceph.conf replay.bin
ssh host-1 'rbd-replay' --map-image 'image=image-1' -c ceph.conf replay.bin

see the mapping?? image → image-0 on host-0, image → image-1 on host-1. it's giving main character energy on every host simultaneously. 🔥

---

👑 AVAILABILITY 👑

rbd-replay-many is part of Ceph, a massively scalable, open-source, distributed storage system. Please refer to the Ceph documentation at <https://docs.ceph.com> for more information. go read it, bestie, it's iconic. 💜

---

🧚 SEE ALSO 🧚

• rbd-replay(8)
• rbd(8)

---

📜 Copyright 📜

2010-2014, Inktank Storage, Inc. and contributors. Licensed under Creative Commons Attribution Share Alike 3.0 (CC-BY-SA-3.0). ✍️

---

aaaand that's the whole page babes 🍓 this one's from dev, dated Oct 06, 2026, and honestly? she ate. periodt. 💅✨🦋