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Conference vaxaxp::vmsnotes

Title:	VAX and Alpha VMS
Notice:	This is a new VMSnotes, please read note 2.1
Moderator:	VAXAXP::BERNARDO

Created:	Wed Jan 22 1997
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	703
Total number of notes:	3722

568.0. "Mixed HSOF versions" by DECPRG::ZVONAR () Tue May 06 1997 12:05

Hello,

please, could somebody tell me if the next configuration is supported under 
Alpha OpenVMS 6.2 or if exists some restriction or potential problems:

1. Different HSOF version on two different HSJ42 (one pair of HSJ in HSJ42 has 
the same version, of course). All HSJ are connected to one starcoupler.

2. OpenVMS volume shadowing between HSJ42 with different HSOF version.

Our customer needs to use on some HSJ42 HSOF 3.1 and on the other HSOF 2.7.

Thanks in advance,
Karel

T.R	Title	User	Personal Name	Date	Lines
568.1	Matching geometry on VMS?	VMSSPT::DIFABIO	MOVL #OPINION,EXE$GL_BLAKHOLE	`Tue May 06 1997 19:19`	5
	Provided the 'units' have the same geometry (cylinder, track, sector) and maximum # of blocks then shadowing the unit's will work. Again, the key is matching geometry. Mark d.
568.2	Check SPDs, Check With HSOF Engineering...	XDELTA::HOFFMAN	Steve, OpenVMS Engineering	`Wed May 07 1997 10:27`	21
	The answer in .1 is correct for OpenVMS host-based volume shadowing. Check with the HSOF folks for controller-based shadowing (mirroring) as well, as certain controllers can controller-shadow (mirror) disks of different geometries -- the "smallest dimensions" of the component disks are used to "synthesize" the final disk geometry. Depending on the geometry algorithm used in the HSJxx controller for a particular mirrorset (and there are apparently several algorithms around), software such as the OpenVMS host-based volume shadowing might -- or might not -- shadow the drive. And in general, it is better to have the same (or compatible�) releases of the HSOF software in use across all controllers. (I'd tend to look at using the HSOF V5.1 and V3.1 releases, at SPDs 60.68.xx (HSJ V5.1), 60.69.xx (HSD V5.1), and 47.26.xx (HSJ V3.1)...) -- �Check with the HSOF folks for their recommendations here.