EMC VMAX-3 series systems were launced almost an year back, and more and more customers are going for VMAX-3 now. From an administration perspective there are few differences with VMAX-3 from the previous VMAX series.
You may read the architectural differences in my previous posts on VMAX-3 series. Let’s discuss some of the most important things to be taken into consideration while creating new devices with the new product series..
No Thick devices:
VMAX-3 series does not support thick devices. All devices are thin devices and space will only be allocated when the system start writing data into it. And the thin device extent is 128KB (improved granularity from 768KB in previous models).
No Meta :
VMAX-3 series does not support meta device creation. With the maximum size of single device support in TBs (240GB is the max size of a single device in VMAX 2nd gen), there’s no need of a meta creation.. 🙂
As meta is not supported, auto meta feature also is not available with VMAX-3 series. You will find N/A for the auto meta feature in symcfg list -v output instead of enabled/disabled.
Increased track size :
VMAX-3 now have a track size of 128KB. It is now doubled from 64KB (1 track = 64KB with the previous generation of VMAX systems) and hence a Cylinder in VMAX-3 is 1920 KB (With VMAX series it was 960KB). This is very much important to remember this during device creations.
More in coming posts… Your thoughts in comments. Thanks.