Changes, Tivoli, Storage – IBM TIVOLI SC32-0129-00 User Manual
Page 16: Manager, Version, Release, 2—january, 2—june
Minimum
I/O
to
Volumes
Associated
with
FILE
Device
Class
In
Tivoli
Storage
Manager
Version
5.3,
the
minimum
I/O
to
a
volume
associated
with
a
FILE
device
class
is
256
KB,
regardless
how
much
data
is
being
written
to
the
volume.
For
example,
if
you
are
backing
up
one
500-byte
object,
it
will
take
256
KB
of
I/O
to
store
it
on
the
volume.
In
terms
of
performance,
the
size
of
the
I/O
for
a
volume
associated
with
a
FILE
device
class
has
the
greatest
impact
when
backing
up
or
archiving
a
large
number
of
small
objects
(for
example,
small
files
or
small
directories).
To
reduce
the
potential
for
performance
degradation,
you
can
increase
the
size
of
aggregates
created
by
the
server.
(An
aggregate
is
an
object
that
contains
multiple
logical
files
that
are
backed
up
or
archived
from
a
client
in
a
single
transaction.)
To
increase
the
size
of
aggregates,
increase
the
value
of
the
TXNGROUPMAX
option
in
the
server
options
file
(dsmserv.opt)
or
increase
the
value
of
the
TXNGROUPMAX
parameter
on
the
REGISTER
NODE
or
UPDATE
NODE
server
commands.
In
addition
to
increasing
the
TXNGROUPMAX
value,
you
might
also
need
to
increase
the
values
for
the
following
options:
v
The
client
option
TXNBYTELIMIT
in
the
client
options
file
(dsm.opt)
v
The
server
options
MOVEBATCHSIZE
and
MOVESIZETHRESH
For
details
about
the
server
options
and
commands,
refer
to
the
Administrator’s
Reference.
For
details
about
the
client
option
TXNBYTELIMIT,
refer
to
the
Backup-Archive
Clients
Installation
and
User’s
Guide.
Note:
For
certain
tasks
(for
example,
using
content-management
products,
using
the
DIRMC
client
option
to
store
directory
information,
or
migrating
very
small
files
using
the
hierarchical
space
management
(HSM)
client),
you
can
minimize
wasted
space
on
storage
volumes
in
a
FILE-type
storage
pool
by
specifying
the
NONBLOCK
data
format
when
defining
the
storage
pool.
In
most
situations,
however,
the
NATIVE
format
is
preferred.
Changes
for
IBM
Tivoli
Storage
Manager
Version
5
Release
2—January
2004
The
following
changes
have
been
made
to
the
product
for
this
edition:
General
Updates
Updates
based
on
the
input
of
users
have
been
made
throughout
the
book.
A
new
section
for
automating
the
storage
agent
startup
has
also
been
added.
See
for
more
information.
Changes
for
IBM
Tivoli
Storage
Manager
Version
5
Release
2—June
2003
The
following
changes
have
been
made
to
the
product
for
this
edition:
LAN-free
for
z/OS
Tivoli
Storage
Manager
now
supports
LAN-free
data
movement
in
storage
area
network
(SAN)
environments
on
the
z/OS
®
and
OS/390
®
operating
systems.
The
z/OS
or
OS/390
server
acts
as
the
data
manager
for
a
client
that
uses
a
storage
agent
See
for
an
xiv
IBM
Tivoli
Storage
Manager
for
SAN
for
AIX:
Storage
Agent
User’s
Guide
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