A different mount will not necessarily improve the time to complete the one-time optimization.
An update to software may be required. Contact your software application provider for more details. Customized software, not provided as a standard market product,
may require modification to ensure the software can handle the extended first mount time.
Speed matching
Edit online
To improve system performance, the drive uses a technique that is called speed matching to dynamically adjust its native (uncompressed) data rate to the slower data rate
of a server.
With speed matching, the drive operates at different speeds when it is reading or writing the Ultrium 8 or later cartridge format. Native data rates are shown in the table.
Table 1. Performance parameters
Ultrium Generation Media
Generation 9 media Generation 8 media Generation 7 media
Speed matching data rates (MB/sec)
408
*
365.0
*
306.0
385
*
341.0
*
287.52
366
*
318.0
*
268.56
347
*
306.4 250.66
325
*
273.0 231.86
305
*
249.5 213.06
284 226.0 194.26
263 203.0 175.46
244 180.0 157.67
223 157.5 138.52
203 135.0 120.11
177 112.0 101.46
*
Full height drives only. Maximum native date rate for full height drives is 400 MB/s, and for half height drives is 300 MB/s.
If the server's net (compressed) data rate is between two of the preceding native data rates, the drive calculates the appropriate data rate at which to operate. Speed
matching dramatically reduces backhitch, the condition that occurs when a tape stops, reverses, and restarts motion. A backhitch is usually the result of a mismatch
between the data rates of the server and the drive.
Channel calibration
Edit online
System performance is optimized by channel calibration.
System performance is further optimized by a feature that is called channel calibration, in which the drive automatically customizes each read/write data channel to
compensate for variations in such things as the recording channel 's transfer function, the media, and characteristics of the drive head.
Data cartridge capacity scaling
Edit online
Capacity scaling enables faster random access to data.
The SET CAPACITY SCSI command enables a customer to capacity scale a data cartridge to enable faster random access. As an example, a customer can capacity scale a
data cartridge to 20% of its normal length that improves the average access time by almost a factor of 5. However, it also reduces the native capacity of the tape to 1.2 TB.
Encryption
Edit online
Data encryption is supported by LTO Ultrium 4 and later data cartridges only.
The IBM® LTO tape drive supports host Application Managed Encryption (AME), with T10 encryption methods.
The encryption-enabled drive contains the necessary hardware and firmware to encrypt and decrypt host tape application data. Encryption policy and encryption keys are
provided by the host application. A drive digital certificate is installed at manufacturing time. Each drive receives a unique serial number and certificate. The T10
Application can validate each drive instance by checking the drive's digital certificate.
Application-managed encryption is supported on AIX®, Windows Server, Linux®, and Solaris. Encryption requires current device drivers, available on the website
https://www-945.ibm.com/support/fixcentral.
For details, see the IBM Tape Device Drivers Encryption Support documentation, and the IBM LTO Ultrium Tape Drive SCSI Reference documentation.
To Next Page
Loading...