Dell PowerVault TL2000 Manuel d'utilisateur télécharger pdf (Page 35)

MODE SELECT 6 (15h)

The MODE SELECT (6) command provides a means for the host to specify peripheral device parameters

to the media changer. Application clients should issue MODE SENSE prior to each MODE SELECT to

determine supported pages, page lengths, changeable variables and to determine is the page is savable

to NVRAM.

Bit 7 6 5 4 3 2 1 0

Byte

0 Operation Code (15h)

1 LUN PF (1) Reserved SP

2 Reserved

3 Reserved

4 Parameter list length

5 Control

Field descriptions:

PF: A PF bit of one indicates that the MODE SELECT parameters following the header and block

descriptor(s) complies with the SCSI-2 specification. The value must be set to 1.

SP: A Save Pages (SP) bit of zero indicates the media changer shall perform the specified MODE

SELECT operation, and shall not save any pages in nonvolatile ram. An SP bit of one indicates

that the media changer shall perform the specified MODE SELECT operation, and shall save the

current values to a nonvolatile RAM.

When a host has successfully issued the MODE SELECT CDB that changed settings in one of the Mode

pages, the media changer will raise a Unit Attention condition to every other host who has not issued this

CDB. The sense data for these hosts will be set to: Mode Parameters Changed (06/2A/01)

The host provides the parameters through a parameter list to the media changer. The parameter list

consists of the following items:

v Parameter List Header

v Mode Select page(s)

Supported Mode Select pages:

Page

Code

Subpage

Code

Page Name Page

saveable in

NVRAM

Page Description

00h 00h Parity Retry page Yes Provides means to select the maximum number

retries performed on a parity error.

0Ah 01h Control Extension page No Provides a means to read out the capabilities of

the SET TIMESTAMP and REPORT TIMESTAMP

commands.

1Ch 00h Tape Alert page No Provides means to select a specific way to report

a Tape Alert event .

1Dh 00h Element Address

Assignment page

Yes Provides a means to change SCSI element

address assignments and respective element

ranges.

1Eh 00h Transport Geometry

page

No Provides a means to set the specifics about the

Transport Element. (not changeable).

Chapter 3. Supported SCSI Commands 3-21

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 115 116

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Dell PowerVault TL2000 Manuel d'utilisateur Page 35

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