# Reclaim Ceph Capacity Through CephFS Transcoding

DevFeed: [Reclaim Ceph Capacity Through CephFS Transcoding](<https://devfeed.tech/articles/reclaim-ceph-capacity-through-cephfs-transcoding-12331.md>)

Original publisher: [Read original article](<https://ceph.io/en/news/blog/2026/cephfs-transcoding-ftw/>)

Author: Anthony D'Atri

Published: 2026-07-01T00:00:00Z

Content type: article

Language: en

Sources: [Ceph Blog](<https://devfeed.tech/sources/ceph-blog.md>)

Topics: [Transcodings](<https://devfeed.tech/topics/transcodings.md>), [Software](<https://devfeed.tech/topics/software.md>), [data](<https://devfeed.tech/topics/data.md>)

Tags: [2026](<https://devfeed.tech/tags/2026.md>), [4k](<https://devfeed.tech/tags/4k.md>), [article](<https://devfeed.tech/tags/article.md>), [blog-post](<https://devfeed.tech/tags/blog-post.md>), [ceph](<https://devfeed.tech/tags/ceph.md>), [cephfs](<https://devfeed.tech/tags/cephfs.md>), [dram](<https://devfeed.tech/tags/dram.md>), [efficiency](<https://devfeed.tech/tags/efficiency.md>), [en-article](<https://devfeed.tech/tags/en-article.md>), [en-blog-post](<https://devfeed.tech/tags/en-blog-post.md>), [enterprise](<https://devfeed.tech/tags/enterprise.md>), [enterprise-storage](<https://devfeed.tech/tags/enterprise-storage.md>), [filesystem](<https://devfeed.tech/tags/filesystem.md>), [fujitsu](<https://devfeed.tech/tags/fujitsu.md>), [git](<https://devfeed.tech/tags/git.md>), [hardware](<https://devfeed.tech/tags/hardware.md>), [performance](<https://devfeed.tech/tags/performance.md>), [software](<https://devfeed.tech/tags/software.md>), [space](<https://devfeed.tech/tags/space.md>), [storage](<https://devfeed.tech/tags/storage.md>), [tentacle](<https://devfeed.tech/tags/tentacle.md>)

## AI overview

This article addresses rising storage demands and hardware costs by discussing CephFS capacity efficiency. It describes replicated pools, Erasure Coding, and Fast EC in Ceph Tentacle, while the title identifies CephFS transcoding as the article's focus.

## Source excerpt

Data expands to fill available storage (and beyond)! ¶ It used to be that enterprise storage meant 6RU rackmount Fujitsu 2351 Eagles, each holding a mind-boggling 380 MiB of data: enough for a whole company! Today that 380 MiB can't even hold a 4k pickleball video. Enterprises, educational instutitions, and really just about anyone these days demand storage capacities that start on the order of hundreds of tebibytes and rapidly grow to pebibytes. As this article is written in the spring of 2026, the memory market, which includes DRAM, SSDs, and legacy HDDs, has experienced a dramatic escalation of pricing. It is not uncommon to be quoted a price four times what the same hardware cost a year ago, and there are signs that it is going to get worse before it gets better. What's a poor ammonite to do?? Cephers find themselves between the Charybdis of quotes approaching Disaster Area's hypermathematics and the Scylla of hungry users armed with torches and git forks. Git forks, pitchforks. Get it? Sigh. Tough room. Anyway... Short of nuking the site from orbit, how do we make everyone happy, or at worst mildly discontented? Efficiency! CephFS ¶ CephFS is a popular, highly available and scalable software-defined POSIX-style distributed filesystem that can easily store tens of pebibytes of precious data. Or, alternately, cat videos. Ceph deployments often begin small, with replicated pools for perceived performance needs. As the cluster grows to more nodes and more data, it may become feasible and desirable to switch to Erasure Coding (EC) to make more efficient use of raw capacity. An EC pool thus can require substantially less raw storage for a given amount of user data, or store gobs more user data on a given amount of raw capacity This EC overhead table presents efficiency (space amplification) factors for a spectrum of EC profiles. Replicated pools usually maintain three copies of data, so for comparison they manifest an overhead factor of 3.0. EC 4+2 or 6+3 presents a