NAME

       volume.config - Traffic Server cache volume configuration file

       The  volume.config  file  enables  you  to  manage  your  cache space more efficiently and
       restrict disk usage by creating cache volumes of  different  sizes.  By  distributing  the
       cache  across  multiple volumes, you can help decrease single-lock pressure when there are
       not many hard drives present. You can further configure these volumes to store  data  from
       certain origin servers and/or domains in the hosting.config file.

FORMAT

       For each volume you want to create, enter a line with the following format:

          volume=volume_number  scheme=protocol_type  size=volume_size

       where  volume_number  is a number between 1 and 255 (the maximum number of volumes is 255)
       and protocol_type is http. Traffic Server supports http for HTTP volume types; volume_size
       is  the  amount  of  cache  space  allocated  to  the  volume.  This value can be either a
       percentage of the total cache space or an absolute value. The absolute  value  must  be  a
       multiple of 128 MB, where 128 MB is the smallest value.  If you specify a percentage, then
       the size is rounded down to the closest multiple of 128 MB.

       Each volume is striped across several disks to achieve parallel I/O. For example: if there
       are  four  disks, then a 1-GB volume will have 256 MB on each disk (assuming each disk has
       enough free space available). If you do not allocate all the disk space in the cache, then
       the  extra disk space is not used. You can use the extra space later to create new volumes
       without deleting and clearing the existing volumes.

EXAMPLES

       The following example partitions the cache across  5  volumes  to  decreasing  single-lock
       pressure for a machine with few drives.:

          volume=1 scheme=http size=20%
          volume=2 scheme=http size=20%
          volume=3 scheme=http size=20%
          volume=4 scheme=http size=20%
          volume=5 scheme=http size=20%

COPYRIGHT

       2020, dev@trafficserver.apache.org