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Message Posted: Thu, 20 Feb 2003 @ 09:38:40 GMT

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Subj:   Re: MAX Disk capacity Per AMP
From:   Dennis Calkins


The Limit isn't really based upon disk size it is based upon the number of CI's (cylinder indexes) and therefore the number of cylinders an amp can support.

Prior to 4.0.1 the file system could only support a maximum of 60,000 cylinders per amp.

If the system was SYSINITED in v2r2 and has never been resysinit in v2r3 or v2r4 you are still running with a very small cylinder size of 1488 sectors per cylinder. (744k )

if you multiply that by 60,000 you get about 43 GIG max.

If you sysinited in v2r3 or v2r4 the cylinder size was bigger or 3872 sectors per cylinder. (1936k )

if you multiply that by 60,000 you get about 112 GIG max.

in 4.0.1 we raised the number of cylinders the file system supported 10 fold to 600,000.

This means we can now support 430 GIG or 1120 GIG (yes that is 1.12 Terabytes) per amp depending on the setting of the sectors per cylinder.

You can check the sectors per cylinder by

Teradata for UNIX --- /usr/ntos/bin/vconfig -x vc | egrep blks_per_cyl

Teradata For windows -- vconfig -x | findstr blks_per_cyl

There may be other restrictions which limit the amount of disk per amp, like reasonable amount of disk per node, but the Teradata File system is no longer one of them.


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