How to allocate 200 GB lun in DMX3&4

1) Do you need to create new symdevices ? Maybe system has existing "un-used" devices that could be used to build your meta device. To list un-used devices:

symdev list -sid 123 -noport

if you must build new devices, the syntax is pretty simple, create a file that contains similar line:

create dev count=256,size=18414,emulation=FBA,config=RAID-5,data_member_count=7,disk_group=0;

in the example i am creating 256 devices, they are ~17G in size (GB = Cylinders * 15 * 128 * 512 divided by 1024 * 1024 * 1024), emulation FBA (for open systems), RAID-5 7+1 configuration.  Run symconfigure

symconfigure -sid 123 -f commit

2) To build meta devices you will need to find (build) devices that are of the same configuration (emulation, size, protection).

form meta from dev 14E9, config=striped, stripe_size=1920;

add dev 14EA to meta 14E9;

add dev 14EB to meta 14E9;

add dev 14EC to meta 14E9;

add dev 14ED to meta 14E9;

symconfigure -sid 123 -f commit

in this example i am building a meta with 5 members, it can be a striped meta or a concatenated meta.

3)

◆ Concatenated metavolumes — Organize addresses for the first byte of data at the

beginning of the first volume, and continue sequentially to the end of the volume.

Data is written sequentially, beginning with the first byte.

◆ Striped metavolumes — Organize addresses sequentially, by using addresses that

are interleaved between hypervolumes.

Data striping benefits configurations with random reads by avoiding stacking

multiple reads on a single spindle and director. Data striping creates a large

metavolume, but balances the I/O activity between the drives and the Symmetrix

system directors.