280 gb filesystem

[jkc924]

Hello all,

New stuff..We are moving to san storage and I need to create 1 logical volume, 1 filesystem size of 280gb. Also one logical volume, one filesystem 10 gb in size. Never created anything this large before. It is for a database. Can anyone give me assistance on parameters to use to create the 280 gb filesystem?

Thanks in advance,
Judy

 

[screwloose]

I would create the filesystem with an nbpi of 32768 and use a fragment size of 2048 or 4096 which will allow a max size of 1073741824 (512-byte blocks). Another thing to consider is the volume group and number of physical volumes associated with this database. A “regular” VG can contain 32 PV’s so you might want to consider making it a “BIG” volume group with the –B flag.

Below is a chart for jfs sizing:
Nbpi fragment size in bytes max size (512-byte blocks)
512 512,1024,2048,4096 16777216
1024 512,1024,2048,4096 33554432
2048 512,1024,2048,4096 67108864
4096 512,1024,2048,4096 134217728
8192 512,1024,2048,4096 268435456
16384 512 268435456
16384 1024,2048,4096 536870912
32768 512 268435456
32768 1024 536870912
32768 2048,4096 1073741824
65536,131072 512 268435456
65536,131072 1024 536870912
65536,131072 2048 10737441824
65536,131072 4096 2147483648

 

[DSMARWAY]

Hi,

How much space willthe SAN allocate to the OS ? i.e. how many LUNS will you have and how big each LUN be ?

It depends whether you want to have several LUNS i.e. disks
or one big LUN . You need to find out if you have one big LUN how will the SAN cope with disk requests or is it recommended to have the 280gb split into smaller chunks.

From this you can then create your filesystem, if you are on AIX 5 > then create jfs2 filesystem , volume group PP size you set for your VOLUME GROUP

HTH