/testfs may grow to 1 TB

there is a way to cheat:
def v filepool /test2fs/file0000
def v filepool /test2fs/file0001
...
so using a script you can manually define more volumes outside the
devclass-defined directory. their sizes are as defined in the devclass.

another approach might be hierarchy of filepools:
 def devclass fileclass1 devtype=file maxcap=64g dir=/test1fs
 def stgpool filepool1 fileclass1 pooltype=primary maxscratch=100
 def devclass fileclass2 devtype=file maxcap=64g dir=/test2fs
 def stgpool filepool2 fileclass2 pooltype=primary maxscratch=100
 upd stg filepool1 next=filepool2
 def devclass fileclass3 devtype=file maxcap=64g dir=/test3fs
 def stgpool filepool3 fileclass3 pooltype=primary maxscratch=100
 upd stg filepool2 next=filepool3
...

You have to take into account that the latter is unusual and during the
years there were some nasty APARs for hierarchies of more than two storage
pools (DISKPOOL -> TAPEPOOL).

Zlatko Krastev
IT Consultant






Eliza Lau <lau AT VTCAT.CC.VT DOT EDU>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
20.09.2004 20:52
Please respond to "ADSM: Dist Stor Manager"

        To:     ADSM-L AT VM.MARIST DOT EDU
        cc:     (bcc: ADSM-L/ACIT)
        Subject:        Re: D2D on AIX


Mark,

Where do you define this
I use this command to define a diskpool:
 def devclass fileclass devtype=file maxcap=64g dir=/testfs
 def stgpool filepool fileclass pooltype=primary maxscratch=100

/testfs is a JFS2 filesystem.  How big can /testfs grow to?  The documents
say 1TB.
When volumes are created in the stgpool filepool, it creates a volume of
64G,
which is the max value you can specify.  Where do you define the 500GB you
said.

Eliza


>
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On
> Behalf Of Eliza Lau
> >Our 3494 with 3590K tapes in 3 frames is getting full.
> >Instead of adding another frame or upgrading to 3590H or 3592
> >tapes we are looking into setting up a bunch of cheap ATA
> >disks as primary storage.
> >
> >The FILE devclass defines a directory as its destination and
> >JFS2 has a max file system size of 1TB.  Does it mean the
> >largest stgpool I can define is 1TB?
>
> No. What it means is that the largest single volume in your diskpool can
> be 1TB. You could have, say, 30 volumes @ 500GB per volume, making a
> total storage pool size of 15TB. Every two volumes would be in their own
> filesystem.
>
> If you're using a disk farm as your primary storage pool, fault
> tolerance is strongly recommended. RAID0 and RAID1+0 would be more
> expensive; RAID5 might make more sense, as long as you were using a
> proper monitoring system (properly set up) to watch the health of your
> disks. Are you using CACHE=YES in your proposed disk solution?
>
> --
> Mark Stapleton (stapleton AT berbee DOT com)
> Berbee Information Networks
>
>