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Wait until the invalid track count is under 30,000 tracks Symrdf -g dgname query (To query a device Group)

symrdf -g dgname est (This initiates an establish for all the SRDF pairs in the device group).

symrdf -g dgname set mode acp_disk (This will turn on the adaptive copy write pending mode for the device group).

symrdf -g dgname disable (Disables consistency protection for SRDF/A pairs in device group).

Symstat -sid 0000 -g groupname -type MEMIO -i 5 -c 5 How to recover SRDF Link Failure If you want to look at only a device group, use the following command: This command will give the write pending tracks for all devices: DEVICE Poor performance on disks due to high write pending count How to find which devices are causing high write pendings A fan-out rate is often referred to as just the n part of the ratio For example, a 16:1 fan-out is also called a fan-out rate of 16, in this case 16 server ports are sharing a single storage port. Fan-out consolidates a large number of server ports on a fewer number of storage ports. By convention fan-out refers to the number of server ports that share a single storage port. What is the Fan-out ratio for an FA port on a Symmetrix V-Maxįan-out ratio is a measure of the number of hosts that can access a storage port at any given time.This topology allows customers to map multiple host HBA ports onto a single FA port.The term fan-out is used to describe the server:storage ratio, where a graphic representation of a n:1 logical topology looks like a hand-held fan, with the wide end toward n.