Tandberg Data SLR140 Internal Grey 6720678400 Benutzerhandbuch
Produktcode
6720678400
SLR140 Features
D:\SLR140 Features for Reliability and
Performance.doc
Performance.doc
Page 3 of 13
Printed: 30.03.04
15:17
White papers or www.imation.com/smallbusiness for backup planning and
implementation guidance.
Like for insurance it is when an incident occurs you can see if the insurance was worth paying for.
Being able to recover from the incident or being able to restore the data after data loss is the whole and
single reason for the insurance and for the backup.
Being able to recover from the incident or being able to restore the data after data loss is the whole and
single reason for the insurance and for the backup.
For a backup device it is essential that data can be restored at any time – on the original device or on a
similar device. A mechanical device like a hard disk drive or a tape drive will break at one time. Disk
drives are much more in use than a tape drive, and disk drives are thus more likely to break if
everything else is similar in regards to mechanical parts. Even a RAID 5 system is not fully fault
tolerant. The more mechanical parts and the more moving mechanical parts, the more likely it is that a
failure will occur earlier. Especially this is true if the mechanical parts have a direct with the media.
similar device. A mechanical device like a hard disk drive or a tape drive will break at one time. Disk
drives are much more in use than a tape drive, and disk drives are thus more likely to break if
everything else is similar in regards to mechanical parts. Even a RAID 5 system is not fully fault
tolerant. The more mechanical parts and the more moving mechanical parts, the more likely it is that a
failure will occur earlier. Especially this is true if the mechanical parts have a direct with the media.
There are several techniques on how to write data to, and read data from a magnetic tape media. The
linear technique is the one using less mechanical and moving mechanical parts that can influence
reading and writing, and thus linear is regarded as the most reliable technique. The linear technique is
used on most higher capacity tape drives for backup like DLT, LTO, Magstar and SLR.
linear technique is the one using less mechanical and moving mechanical parts that can influence
reading and writing, and thus linear is regarded as the most reliable technique. The linear technique is
used on most higher capacity tape drives for backup like DLT, LTO, Magstar and SLR.
Linear technique means writing data on a longitude track in the whole length of the tape media. Only
at the end of the media the write/read head is moved to another position and to a new track.
The Tandberg SLR (Scalable Linear Recording) product is the tape drive – within linear technology -
that has the fewest moving mechanical parts – the head, and the capstan motor in addition to the
cartridge load/eject mechanism which all technologies have. The read/write head is moved to another
position/track at the end or beginning of the tape media whilst the capstan motor drives the tape media
in forward and reverse directions. For the SLR technology, the media is always inside the cartridge,
and all media wear components are inside that cartridge. This again means higher quality as most of
the wear parts of the backup system are replaced when the media is changed.
that has the fewest moving mechanical parts – the head, and the capstan motor in addition to the
cartridge load/eject mechanism which all technologies have. The read/write head is moved to another
position/track at the end or beginning of the tape media whilst the capstan motor drives the tape media
in forward and reverse directions. For the SLR technology, the media is always inside the cartridge,
and all media wear components are inside that cartridge. This again means higher quality as most of
the wear parts of the backup system are replaced when the media is changed.
4. Importance of High Performance
Time available for backup
For more and more companies, the time window for backup is shrinking while the amount of data is
increasing. For some server platforms, the time window for backup is down to one hour or even less.
To cope with such requirements one needs not only a fast tape drive, but also a tape drive that can
adopt to the speed of the data coming to the tape drive. Also the data path from the hard disk to be
backed up to the tape drive is essential. A 100Mbit-network connection line only can support about 4
to 5 Mbytes/sec of data transfer in total for all devices connected. This means only 14 to 18 gigabytes
per hour shared between all devices communicating on this network. Thus a direct connection of the
backup tape drive to the host/server where the hard disk is installed is the best solution. For such a
direct connection using a Ultra 2 SCSI interface, the possible burst transfer rate of the bus is 80
Mbytes/sec – or 288 gigabytes per hour. Then the speed of the backup is limited to the maximum
speed of the tape drive, and how well the tape drive can buffer, compress, and process different types
of data.
increasing. For some server platforms, the time window for backup is down to one hour or even less.
To cope with such requirements one needs not only a fast tape drive, but also a tape drive that can
adopt to the speed of the data coming to the tape drive. Also the data path from the hard disk to be
backed up to the tape drive is essential. A 100Mbit-network connection line only can support about 4
to 5 Mbytes/sec of data transfer in total for all devices connected. This means only 14 to 18 gigabytes
per hour shared between all devices communicating on this network. Thus a direct connection of the
backup tape drive to the host/server where the hard disk is installed is the best solution. For such a
direct connection using a Ultra 2 SCSI interface, the possible burst transfer rate of the bus is 80
Mbytes/sec – or 288 gigabytes per hour. Then the speed of the backup is limited to the maximum
speed of the tape drive, and how well the tape drive can buffer, compress, and process different types
of data.
Direction of recording
Change track = move head
Change tape direction
Change tape direction