From 9499a7d2939449f1daeaab222b4349709d9973a6 Mon Sep 17 00:00:00 2001 From: MikeG451 Date: Tue, 31 Jan 2017 17:48:03 +0000 Subject: [PATCH] Max partitions/disks in Operational considerations Arch Design Guide misworded Revise Scaling Object Storage section of Operational considerations in OpenStack Architecture Design Guide. Guide uses disks where it should say partitions and reword incorrect sentence. Change-Id: Ida78a215ad44da65dc254f5f7f39554f1b8b9dbd Closes-bug: #1513469 --- .../source/storage-focus-operational-considerations.rst | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/doc/arch-design/source/storage-focus-operational-considerations.rst b/doc/arch-design/source/storage-focus-operational-considerations.rst index 6affd09318..a687d80838 100644 --- a/doc/arch-design/source/storage-focus-operational-considerations.rst +++ b/doc/arch-design/source/storage-focus-operational-considerations.rst @@ -218,15 +218,15 @@ careful planning and consideration. In the design phase, it is important to determine the maximum partition power required by the Object Storage service, which determines the maximum number of partitions which can exist. Object Storage distributes data among all available storage, but -a partition cannot span more than one disk, so the maximum number of -partitions can only be as high as the number of disks. +a partition cannot span more than one disk, although a disk can have +multiple partitions. For example, a system that starts with a single disk and a partition power of 3 can have 8 (2^3) partitions. Adding a second disk means that each has 4 partitions. The one-disk-per-partition limit means that this -system can never have more than 8 disks, limiting its scalability. +system can never have more than 8 partitions, limiting its scalability. However, a system that starts with a single disk and a partition power -of 10 can have up to 1024 (2^10) disks. +of 10 can have up to 1024 (2^10) partitions. As you add back-end storage capacity to the system, the partition maps redistribute data amongst the storage nodes. In some cases, this