Invalid tracks
Invalid tracks are tracks that are not synchronized, that is, they are tracks that are
“owed” between the two devices in an SRDF pair.
R11 devices
R11 devices operate as the R1 device for two R2 devices. Links to both R2 devices are
active.
R11 devices are typically used in SRDF/Concurrent solutions where data on the R11
site is mirrored to two secondary (R2) arrays.
The following image shows an R11 device in an SRDF/Concurrent Star solution.
Figure 26 R11 device in concurrent SRDF
Site
A
Source
Site
B
Target
Site
C
Target
R11
R2
R2
R21 devices
R21 devices operate as:
l
R2 devices to hosts connected to array containing the R1 device, and
l
R1 device to hosts connected to the array containing the R2 device.
R21 devices are typically used in cascaded 3-site solutions where:
l
Data on the R1 site is synchronously mirrored to a secondary (R21) site, and then
l
Synchronously mirrored from the secondary (R21) site to a tertiary (R2) site:
Remote replication solutions
118 Product Guide VMAX 100K, VMAX 200K, VMAX 400K with HYPERMAX OS
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