From 23761c310273288d1dd2151d3aa468e31cca7965 Mon Sep 17 00:00:00 2001
From: "Pedro hates github.com"
 <39959198+pedro-nonfree@users.noreply.github.com>
Date: Wed, 15 Apr 2020 15:11:36 +0200
Subject: [PATCH] warnings on purge local media

---
 Synapse-database-maintenance-tools.md | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Synapse-database-maintenance-tools.md b/Synapse-database-maintenance-tools.md
index e44f905..7e84f29 100644
--- a/Synapse-database-maintenance-tools.md
+++ b/Synapse-database-maintenance-tools.md
@@ -4,11 +4,15 @@ List of useful tools and scripts for maintenance Synapse database:
 The purge remote media API allows server admins to purge old cached remote media.
 
 #### Purge local media 
-There is no purge API for local media because you may be the only one with a copy. If you are sure you want to delete local media you could use something like the following to delete media that hasn't been accessed in a while.
+
+There is no purge API for local media because you may be the only one with a copy. If you are sure you want to delete local media you could use something like the following to delete media that hasn't been accessed in a while. **Warning 1, check noatime flag**: You also have to double-check that the filesystem where synapse's media store don't have [noatime flag](https://unix.stackexchange.com/questions/219015/how-to-disable-access-time-settings-in-debian-linux/219017#219017). Check it with `mount`, `noatime` is something that is usually enabled by default to reduce read-write operations in the filesystem for a feature is not so demanded. **Warning 2, what contents**, the next command applies to `local_content  local_thumbnails  remote_content  remote_thumbnail` (that are the subdirectories of media directory), remote content should use [Purge History API](https://github.com/matrix-org/synapse/blob/master/docs/admin_api/purge_history_api.rst), and maybe you want to delete just the `local_content` ?
 
 `find /path/to/synapse/media_store -atime +365 -delete`
+
 This will delete media that hasn't been accessed in 365 days.
 
+*I think this section is missing some coherence with the database structure*
+
 ## [Purge History API](https://github.com/matrix-org/synapse/blob/master/docs/admin_api/purge_history_api.rst)
 The purge history API allows server admins to purge historic events from their database, reclaiming disk space.