Hi Ron ...  This is it  Data Marked Dirty = 25 writes x 128KiB extend x 15 minutes x 60 Seconds = 2,880,000 KiB  A COFW deals in 64 KiB chunks, so the data marked dirty must be divided by 64, to give 45,000 COFWs.  Dividing the 64 KiB by 8 KiB, as you did, is only applicable in the case of sequential writes  (From a Senior EMC )
We have the following scenario:Customer requirements call for a SnapView snapshot to be made of a clone prior to resynchronization. The source LUN is 256 GiB, and performs 500 random reads/s and 25 random writes/s of 8 KiB. The clone will be fractured every 15 minutes, and resynchronized after the snapshot is started. How many COFWs will be performed each time the clone is resynchronized?  So I calculated on this but I seem to go wrong some wherethis is what I have done: 256GB source LUN so the Extend will be 128GBData Marked Dirty = 25 writes x 128KiB extend x 15 minutes x 60 Seconds = 2,880,000 With 8Kib writes it means that you have 64Kib : 8Kib = 8 writes to have a full stripeSo 2,880,000 : 8 = 360,000   COFW  What am I doing wrong ?
How many COFW when a clone re-sync