Buffer size, Specifying the data to backup, Compression level – Storix Software SBAdmin TSM Edition Users Guide User Manual
Page 33
Note that after assigning a profile to a backup job, you may customize the profile further for the specific job.
Therefore, it is required that only one backup profile exists. Refer to
for more
information.
Use
at any time to display a description or instructions for a particular option. Most options are
described in detail in the help information and are therefore not shown here. There are a few special
considerations:
Buffer Size
The buffer size represents the amount of data to accumulate in memory before writing that “buffer” to the
backup device. In actuality, SBAdmin uses many buffers for best performance, but the amount of data
written to any device at one time is set using the
Buffer Size option.
Using a buffer size larger than the physical device can handle will result in an I/O error writing to the device,
which generally varies by operating system or device driver. The default of 128K is adequate for most
devices without exceeding their hardware limit. However, for best performance, especially when using high-
speed tape drives, disk drives and RAID devices, you can increase this number. A value of 512 or 1024 is
often best.
Note that, while not excessive, a larger buffer size will cause SBAdmin to use more memory during a
backup. Also, if you use a large buffer size, you may see a backup slow down if the system is unable to
write a large buffer to the device fast enough, or if there is limited memory on the system. For this reason,
it’s best to experiment with different buffer sizes until you find the best backup performance for your device.
Specifying the Data to Backup
The description of the first field in the
General Options section will differ based on the backup type you
selected for this profile. In this field, you may enter the data to backup. This information is not required at
this time and may be filled in when configuring the backup job later. Because TSM Edition only supports
“full system” backup types, the type of data in this field will be either volume groups (Linux/AIX) or ZFS
pools (Solaris). You may also enter “
all” to include all volume groups or ZFS pools. You may also enter a
list of options to exclude. For example, to include all volume groups EXCEPT the “tempvg” volume group,
type:
all –tempvg
If you want to exclude all volume groups and ZFS pools you may leave this option blank. Leaving this
option blank does have different effect depending on the type of client the backup is performed on. On an
AIX system, leaving this option blank will still include the
rootvg volume group (required on a base system).
It will also include all volume group definitions of currently defined volume groups but will not backup the
data within the excluded volume groups. On a Linux system, leaving this option blank will exclude all LVM
data including their definitions and data. Likewise, leaving the field empty on a Solaris system will exclude
all filesystems and volumes contained in ZFS pools.
If any items within the data list do not apply to a client, the item will simply be
ignored. For example, using a data list containing the volume group “VolGroup00”, a
client without a VolGroup00 volume group will simply skip this volume group.
Compression Level
As noted in the Configure Servers section, there are two methods of compression which may be applied to
backup data – TSM and SBAdmin compression. By default, no SBAdmin compression will be used (this
field will be set to “None”).
A selection of “yes” simply indicates that TSM will compress backup data on the client before sending to the
server. It is important to not, however, that SBAdmin provides its own compression options (see
). If you choose to use SBAdmin compression, then no TSM compression will
be used regardless of your selection here. If you want to use TSM compression, you should select “yes” in
Storix System Backup Administrator
33
Version 8.2 TSM Edition User Guide