Thursday, April 16, 2009

Define a RAW volume to TSM

One of the main advantages of disk pools is the timing of send high loads to your tape drives.
Within TSM, there are three types of disk pools: Random Access Disk Pools (of device class DISK), File Disk Pools (of device class FILE) – files on hard drives that store data sequentially as on tape, and RAW Disk Pools.

The 3 types differ in the use and the performance you can reach. Best performance for large file migrations is found in RAW volumes. Random access disk pools are best for small files. In the middle, we find file disk pools which have the advantage of sequential read and write operations which make it better than random access disk pools.

The size of each volume within a disk pool seems to be very important within TSM. To improve performance, reduce the size of and increase the count of the volumes. Furthermore, and only on random access volumes, a single corrupt volume can be taken varied to offline without halting operations to the entire storage pool.

To define a RAW volume to TSM, follow these steps:

1. Prepare a raw volume using Operating System commands; raw volume ls_name and platform AIX is used here.

2. Define to a storage pool:

def v stgp_name /dev/rls_name [ /code ]

3. Define as a TSM database volume:

def dbv /dev/rls_name

4. Define as a TSM log volume:

def logv /dev/rls_name

For the PDF version of this document, send a blank email, with subject line "Define a RAW volume to TSM", to TSM Assist

1 comment:

  1. I m unable to Define a RAW volume to TSM

    tsm: TSMSRV>def v DISKDATA /dev/rddvol_01
    ANR2404E DEFINE VOLUME: Volume /dev/rddvol_01 is not available.
    ANS8001I Return code 14