From aed1bd10f559fd5428bc1c259d324aa78a2de511 Mon Sep 17 00:00:00 2001 From: Ward Vandewege Date: Wed, 20 Jan 2016 11:25:20 -0500 Subject: [PATCH] Doc improvement: explain in more detail what the -serialize argument to keepstore does. closes #8248 --- doc/install/install-keepstore.html.textile.liquid | 2 ++ 1 file changed, 2 insertions(+) diff --git a/doc/install/install-keepstore.html.textile.liquid b/doc/install/install-keepstore.html.textile.liquid index efeff65b83..f5e8193cd6 100644 --- a/doc/install/install-keepstore.html.textile.liquid +++ b/doc/install/install-keepstore.html.textile.liquid @@ -116,6 +116,8 @@ The @-max-buffers@ argument limits keepstore's memory usage. It should be set su If you want access control on your Keepstore server(s), you must specify the @-enforce-permissions@ flag and provide a signing key. The @-blob-signing-key-file@ argument should be a file containing a long random alphanumeric string with no internal line breaks (it is also possible to use a socket or FIFO: keepstore reads it only once, at startup). This key must be the same as the @blob_signing_key@ configured in the "API server's":install-api-server.html configuration file, @/etc/arvados/api/application.yml@. +The @-serialize=true@ (default: @false@) argument limits keepstore to one reader/writer process per storage partition. This avoids trashing by allowing the storage device underneath the storage partition to do read/write operations sequentially. Enabling @-serialize@ can improve Keepstore performance if the storage partitions map 1:1 to physical disks that are dedicated to Keepstore, particularly so for mechanical disks. In some cloud environments, enabling @-serialize@ has also also proven to be beneficial for performance, but YMMV. If your storage partition(s) are backed by network or RAID storage that can handle many simultaneous reader/writer processes without trashing, you probably do not want to set @-serialize@. + h3. Set up additional servers Repeat the above sections to prepare volumes and bring up supervised services on each Keepstore server you are setting up. -- 2.39.5