CODEWITHSUNDEEP
scsi
HEKTO
HEKTO

Reputation: 4191

COMPARE AND WRITE on umapped block?

The COMPARE AND WRITE command description in the SBC-4 doesn't say anything about the case when the range of logical blocks to be replaced contains unmapped blocks.

What's the common practice to deal with this case on the target side? Should a target assume that the verification step is always successful in the case when an initiator asks to replace unmapped blocks with something meaningful?

Upvotes: 1

Views: 589

Answers (1)

Baruch Even
Baruch Even

Reputation: 2646

When a block is unmapped it is equal to all zeroes. You should perform all your commands that read or compare data with this block as it was just zeroes.

Upvotes: 1

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