From: Matthew Sakai <msakai@redhat.com>
To: dm-devel@lists.linux.dev
Cc: Matthew Sakai <msakai@redhat.com>
Subject: [PATCH] dm vdo doc: document metadata size
Date: Thu, 7 Mar 2024 17:42:08 -0500 [thread overview]
Message-ID: <9a8f119dfffac40f416dee63cbbb9778ed8e4a26.1709851277.git.msakai@redhat.com> (raw)
Signed-off-by: Matthew Sakai <msakai@redhat.com>
---
Documentation/admin-guide/device-mapper/vdo.rst | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/Documentation/admin-guide/device-mapper/vdo.rst b/Documentation/admin-guide/device-mapper/vdo.rst
index a3572582ead8..7e1ecafdf91e 100644
--- a/Documentation/admin-guide/device-mapper/vdo.rst
+++ b/Documentation/admin-guide/device-mapper/vdo.rst
@@ -34,6 +34,17 @@ The repo also contains additional userspace tools which can be used to
inspect a vdo target's on-disk metadata. Fortunately, these tools are
rarely needed except by dm-vdo developers.
+Metadata requirements
+=====================
+
+Each vdo volume reserves 3GB of space for metadata, or more depending on
+its configuration. It is helpful to check that the space saved by
+deduplication and compression is not cancelled out by the metadata
+requirements. An estimation of the space saved for a specific dataset can
+be computed with the vdo estimator tool, which is available at:
+
+https://github.com/dm-vdo/vdoestimator/
+
Target interface
================
--
2.42.0
reply other threads:[~2024-03-07 22:42 UTC|newest]
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