VERITAS Storage Foundation 4.1 Cross-Platform Data Sharing Administrator's Guide

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30 VERITAS Storage Foundation CDS Administrator’s Guide
Using vxvol to Set a DRL Map Length
You can use vxvol only if the volume is stopped (that is, the DRL is inactive).
# vxvol -g dgTestSol2 set logmap_len=512 drlvol
The vxvol set command does not change the existing DRL map size.
Note When specifying a loglen attribute, specifying a value less than the minimum required
(twice the disk group alignment value) results in an error message.
The value of loglen is constrained by size of the logging subdisk.
The value of logmap_len is constrained by the log length.
If both logmap_len and loglen are specified, then, if logmap_len is greater than
loglen/2, vxvol fails with an error message, and you then have to either increase loglen to a
sufficiently large value or decrease logmap_len to a sufficiently small value.
The value of logmap_len is in units of bytes, and the value of loglen is in units of blocks.
logmap_len cannot exceed the number of bytes in the on-disk map. The number of bytes in the
on-disk map can be calculated as follows:
[ROUND_DOWN(loglen/nmaps) - VOLDRL_HEADER_SIZE]
where nmaps is 2 for a private disk group or 33 for a shared disk group, ROUND_DOWN()
represents rounding down to a log map alignment boundary, and the value of
VOLDRL_HEADER_SIZE is 24.
Displaying Information
This section describes:
◆ Displaying Traditional DRL Map Size and Log Size
◆ Displaying the Disk Group Alignment
◆ Displaying Volume Log Map Values
◆ Listing Offset and Length Information
◆ Listing CDS Disk Groups
◆ Listing Disks
◆ Displaying Device Quotas for CDS Disk Groups