Dell NetWorker 19.9 Administration Guide

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Supported WORM and DLTWORM tape drives

NetWorker supports write-once, read-many (WORM) tape drives and media. It is able to recognize the WORM abilities of tape drives and the presence of WORM media in those drives. It also supports the creation of DLTWORM (formerly DLTIce) tapes in drives that are DLTWORM capable.

The following table describes the WORM devices that are supported by the NetWorker software. For a complete listing of supported devices, refer to the NetWorker Hardware Compatibility Guide.

Table 1. WORM supported devices
Device	Description
HP LTO Ultrium 3 and higher	Unique to HP Ultrium-3 and higher: Inquiry VPD page 0xb0, byte 4 bit 0 indicates WORM capable Read attribute # 0x0408 bit 7 to indicate WORM media present
Quantum SDLT600, DLT-S4, and DLT-V4 (SCSI and SATA)	Any drive with product inquiry data of “DLT” tape drive that reports WORM capability the way these drives do (“Quantum” not required in the vendor inquiry data): Inquiry data VPD page 0xc0, byte 2, bit 0 to indicate WORM capable Read attribute # 0x0408 bit 7 to indicate WORM media present
Sony AIT-2, AIT-3, AIT-4, and SAIT	Any drive with “Sony” in the vendor inquiry data that reports WORM capability like these drives do: Mode sense page 0x31, byte 5 bit 0 indicates WORM capable Mode sense byte 4 bit 6 indicates WORM tape present
IBM 3592	Unique to IBM 03592: Mode sense page 0x24, byte 7 bit 4 indicates WORM capable Mode sense page 0x23, byte 20 bit 4 indicates WORM tape present
STK 9840A/B/C, 9940B, T10000	Any drive with STK as the vendor data that reports WORM capability like these: Standard inquiry data byte 55 bit 2 indicates WORM capable Request sense data byte 24 bit 1 indicates WORM tape present
IBM LTO Ultrium 3 and higher, and Quantum LTO Ultrium 3 and higher	These drives use the SCSI-3 method to report WORM capabilities, so there is not a match against any of the inquiry data. Any drive that does not match the inquiry data patterns listed above will have the SCSI-3 method applied to them: Inquiry data VPD page 0xb0, byte 4, bit 0 indicates WORM capable Mode sense page 0x1d, byte 2 bit 0 indicates WORM tape present Byte 4, bits 0,1: label restrictions include - 00 indicates no overwriting allowed - 01 indicates some labels can be overwritten Byte 5, bits 0,1: filemark overwrite restrictions - 0x02: any filemark at EOD can be overwritten except for the one closest to the beginning of the tape - 0x03: any filemark at EOD can be overwritten

The WORM and DLTWORM attributes determine whether or not the NetWorker software will back up to a write once-read many (WORM) tape. You can apply these tape attributes to any pool.

NOTE:Various Quantum drive models (SDLT600, DLT-S4, and DLT-V4) have the ability to create WORM tapes from ordinary blank DLT tapes supported by that particular drive. You cannot recycle an existing NetWorker tape to create a DLTWORM volume without first having bulk-erased the tape. When the DLTWORM attribute is set, labeling one of these drives into a WORM pool causes the Quantum drive to make the current tape a WORM tape.

Savegroups that belong to pools that have either the WORM or DLTWORM attribute set, are considered to be WORM savegroups.