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© 2011 IBM Corporation1 Tape Logical Block Protection (aka Tape Checksum ) Kevin D. Butt SCSI Architect, Data Protection & Retention, IBM T10/SSC Working Group Secretary MS 6TYA, 9000 S. Rita Rd., Tucson, AZ Tel: Fax: (T/L:321) address:
© 2011 IBM Corporation2 Traditional methods used to try to get data protection Drive adds protection information to each logical block –vendor-specific format –Add CRC –Add ECC & other data validation/reconstruction methods –after received at drive during process of storing on media (next slide shows an animated example) Drive reads after write and validates CRC Some applications add unique protection information as part of the data –Allows verification that nothing changed, but only when data is read –Does not provide detection on write –Does not allow for checking at various points during the transfer –No method for the drive to validate the blocks without transferring them to the application. –Sometimes saves to a database of meta-data
© 2011 IBM Corporation3 Application Data Media CRC Engine Application Data Buffer Traditional Protection of Tape Data Application Data Buffer Logical Block Application Back End Device Driver HBA Tape Drive Write SCSI (Fibre Channel/SAS/pSCSI/etc.) Formatter Logical BlockCRCLogical BlockCRC Application Data Buffer Logical Block Read Formatter Media Logical BlockCRCLogical BlockCRC This is an animated slide Application Data Application Front End Application Transport (Ethernet/FICON/ESCON/etc.) Logical Block CRC added in drive CRC removed in drive
© 2011 IBM Corporation4 Tape Logical Block Protection Added to standards (SSC-4) in January 2010 Write path is independent from Read path –Can read w/o CRC and can write with CRC –Can write w/o CRC and can read with CRC –Can write w/o CRC and can read w/o CRC –Can write with CRC and can read with CRC CRC is generated/checked at each end –Tape drive –Application CRC may be checked at any point along the path –HBA –Any system/software that is in the middle
© 2011 IBM Corporation5 Tape Logical Block Protection (cont) On WRITE (example in top half of following animated slide) –CRC is appended to each logical block at the source –CRC is checked at any point desired in the transfer –If corruption occurs, the exact location of problem is known –The logical block with CRC is validated before being committed to media –Data is known on to be on tape in uncorrupted form prior to releasing the source data –CRC is stored with each logical block On READ (example in bottom half of following animated slide) –logical block with the CRC is read and validated –CRC transferred with each logical block –CRC is check at any point desired in the transfer –The CRC is validated and stripped at the destination
© 2011 IBM Corporation6 Application Data Application Data Buffer Media Application Data Buffer Logical block CRC Protected logical block Logical block CRC Protected logical block CRC Engine Tape Logical Block Protection using SSC-4 method Application Back End Device Driver HBA Tape Drive Write SCSI (Fibre Channel/SAS/pSCSI/etc.) Formatter This is an animated slide Application Front End Application Transport (Ethernet/FICON/ESCON/etc.) CRC checked in drive CRC generated & added in application CRC may be checked in HBA CRC may be checked in application back-end CRC Application Data Application Data Buffer Media Application Data Buffer Logical block CRC Protected logical block Logical block CRC Protected logical block CRC Engine Formatter CRC checked in drive Read CRC CRC validated & removed in application CRC may be checked in HBA CRC may be checked in application back-end CRC
© 2011 IBM Corporation7 Logical Block Protection – VERIFY features Uses the VERIFY command defined in SSC-4 Adds new options to: –Check that protection information (i.e., CRC) is the same as currently configured –Used in conjunction with other new options –Check that protection information (i.e., CRC) validates on each logical block from current position for n number of files (i.e., FMKS) –No blocks are transferred over the SCSI interface –Happens at native data rate –Check that protection information (i.e., CRC) validates on each logical block from current position to EOD –No blocks are transferred over the SCSI interface –Happens at native data rate
© 2011 IBM Corporation8 Logical Block Protection – VERIFY to EOD example
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