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Product: Storage Foundation Guides | |
Manual: Storage Foundation 4.1 Cross-Platform Data Sharing Administrator's Guide |
Alignment ValuesThe disk group block alignment has two values: 1 block or 8k (8 kilobytes). Alignment Value 1![]() All disk group versions before version 110 must have a alignment value of 1. Disk groups have an alignment value of 1 after upgrading from pre-version 110 to version 110 or later. Encapsulated disks, which require disk cylinder alignment, have an alignment value of 1. Non-CDS disk groups version 110 and later can have either a value of 1 block or 8k. Alignment Value 8KNon-CDS disk groups version 110 and later can have either a value of 1 block or 8k. All CDS disk groups have an alignment value of 8k. The alignment for all newly initialized disk groups in VxVM 4.0 or a later release is 8k. This value (which is used when creating the disk group) cannot be changed. However, the disk group alignment can be subsequently changed (refer to Changing the Alignment of a Non-CDS Disk Group). ![]() Dirty Region Log (DRL) AlignmentThe location and size of each map within a Dirty Region Log (DRL) must not violate the disk group alignment for the disk group (containing the volume to which the DRL is associated). This means that the region size and alignment of each DRL map must be a multiple of the disk group alignment, which for CDS disk groups is 8K. (Features utilizing the region size can impose additional minimums and size increments over and above this restriction, but cannot violate it.) In a version 110 disk group, a traditional DRL volume must have:
In a version 110 disk group, a version 20 DCO volume must have:
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Product: Storage Foundation Guides | |
Manual: Storage Foundation 4.1 Cross-Platform Data Sharing Administrator's Guide | |
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