HP StorageWorks 1000i HP StorageWorks 1000i Virtual Library System User Guide - Page 17

Retention, planning

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Emulation The VLS1000i can emulate: • a standalone tape drive, with a 1:1 relationship between cartridges and drives • a library, with multiple cartridges and 1 or more drives Both emulations are based on LTO-2 drive technology. When you use emulation, the disk drives on the VLS appear to your backup software as LTO-2 tape cartridges, which simplifies the setup process while simultaneously providing data compression and the attributes of backing up data to disk. NOTE: Data compression can be used, but it reduces the data transfer speed significantly. Retention planning Retention planning and sizing go hand in hand. How long do you need to keep data on disk? How many full backups do you want to keep on disk? How many incremental backups? How do you want to optimize retention times of the VLS? Retention policies help you recycle virtual media. Bear the following considerations in mind as you plan retention policies: • If the data's useful life is too short to warrant backup to tape, you might choose to keep it on disk. • Once the retention period expires, the virtual media is automatically recycled (remember that you never remove tapes from a virtual library so you want the backup application to keep re-using the same virtual tapes based on their retention recycling periods). • In your backup application you should set the tape expiration dates (that is, when the tape is marked as worn out) high because virtual media does not wear out. • Backup-job retention time is for virtual media. • Copy-job retention time is for physical media. • When copying through the backup application, the virtual and physical pieces of media are tracked separately and the retention times should be considered and set individually. HP StorageWorks 1000i Virtual Library System 17

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Emulation
The
VLS1000i
can
emulate:
•
a
standalone
tape
drive,
with
a
1:1
relationship
between
cartridges
and
drives
•
a
library,
with
multiple
cartridges
and
1
or
more
drives
Both
emulations
are
based
on
LTO-2
drive
technology.
When
you
use
emulation,
the
disk
drives
on
the
VLS
appear
to
your
backup
software
as
LTO-2
tape
cartridges,
which
simpli
fi
es
the
setup
process
while
simultaneously
providing
data
compression
and
the
attributes
of
backing
up
data
to
disk.
NOTE:
Data
compression
can
be
used,
but
it
reduces
the
data
transfer
speed
signi
fi
cantly.
Retention
planning
Retention
planning
and
sizing
go
hand
in
hand.
How
long
do
you
need
to
keep
data
on
disk?
How
many
full
backups
do
you
want
to
keep
on
disk?
How
many
incremental
backups?
How
do
you
want
to
optimize
retention
times
of
the
VLS?
Retention
policies
help
you
recycle
virtual
media.
Bear
the
following
considerations
in
mind
as
you
plan
retention
policies:
•
If
the
data’s
useful
life
is
too
short
to
warrant
backup
to
tape,
you
might
choose
to
keep
it
on
disk.
•
Once
the
retention
period
expires,
the
virtual
media
is
automatically
recycled
(remember
that
you
never
remove
tapes
from
a
virtual
library
so
you
want
the
backup
application
to
keep
re-using
the
same
virtual
tapes
based
on
their
retention
recycling
periods).
•
In
your
backup
application
you
should
set
the
tape
expiration
dates
(that
is,
when
the
tape
is
marked
as
worn
out)
high
because
virtual
media
does
not
wear
out.
•
Backup-job
retention
time
is
for
virtual
media.
•
Copy-job
retention
time
is
for
physical
media.
•
When
copying
through
the
backup
application,
the
virtual
and
physical
pieces
of
media
are
tracked
separately
and
the
retention
times
should
be
considered
and
set
individually.
HP
StorageWorks
1000i
Virtual
Library
System
17