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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

566.0. "How many shadow sets you try?" by OSOSPS::HIRAIWA (Yoshitaka Hiraiwa/SPS) Tue May 06 1997 03:23

Hi, 

Looking at the SPD for V6.1 Volume Shadowing supports a maximum of 130 shadow
sets. My customer has exceeded 130 shadowsets for some time now.

I'd like to know how many shadow sets other customers have or had in past
on VMS/VAX V6.1?

Please let me know!

Thanks for any help
Yoshitaka Hiraiwa/SPS/MCS/DEC-J

T.R	Title	User	Personal Name	Date	Lines
566.1	304 over here	OPCO::TSG_PLL	Live and Sweaty	`Tue May 06 1997 04:21`	7
	My customer had 304 shadowsets under V6.1 Mostly they were single member shadowsets, less than 30 were two member shadowsets. This, of course, guarantees nothing but it may help you to sleep easier at night. Cheers Paul
566.2	good sleep	OSOSPS::HIRAIWA	Yoshitaka Hiraiwa/SPS	`Wed May 07 1997 07:17`	15
	Thank you for quick reply, Paul! >My customer had 304 shadowsets under V6.1 My customer has two clusters. One has 169 shadowsets, other has 155 shadowsets. Mostly they are two member shadowsets. >This, of course, guarantees nothing but it may help you to sleep >easier at night. Yes, this gurantees nothing indeed, but I have a good sleep. Thanks Yoshitaka
566.3		EVMS::MORONEY	vi vi vi - Editor of the Beast	`Wed May 07 1997 12:59`	5
	I believe the supported limit for V7.1 is now 200 sets. There isn't any hard limit other than the max. unit number of 9999 as long as you have enough nonpaged pool, license units (if applicable) and, of course, disk drives.
566.4	for a better sleep	OSOSPS::HIRAIWA	Yoshitaka Hiraiwa/SPS	`Thu May 08 1997 01:10`	32
	Thank you for reply! >I believe the supported limit for V7.1 is now 200 sets. Reading from V7.1 SPD, multimember shadowsets is 500 sets. Single shadowsets is unlimited. >There isn't any hard limit other than the max. unit number of 9999 as long as >you have enough nonpaged pool, license units (if applicable) and, of course, >disk drives. NPAGEDYN is 135000000 and my customer has unlimited license and over 800 disks on each cluster. Is there any consideration? Thanks Yoshitaka P.S. Volume Shadowing for OpenVMS, Version 7.1 SPD 27.29.14 Configuration Limits Volume Shadowing for OpenVMS supports a maximum of 500 disks in multimember (2- or 3-member) shadow sets on a single OpenVMS Cluster. An unlimited number of single-member shadow sets is allowed on the same OpenVMS Cluster. These limits are independent of controller and device type.
566.5	500 disks, not 500 sets?	WIBBIN::NOYCE	Pulling weeds, pickin' stones	`Thu May 08 1997 08:59`	8
	> Reading from V7.1 SPD, multimember shadowsets is 500 sets. Single shadowsets > is unlimited. > Volume Shadowing for OpenVMS supports a maximum of 500 disks in > multimember (2- or 3-member) shadow sets on a single OpenVMS Cluster.... I read this to say you can have 250 2-member sets, or 166 3-member sets, or anything in between.
566.6	I'm sorry.	OSOSPS::HIRAIWA	Yoshitaka Hiraiwa/SPS	`Thu May 08 1997 22:23`	13
	>> Volume Shadowing for OpenVMS supports a maximum of 500 disks in >> ^^^^^ >I read this to say you can have 250 2-member sets, or 166 3-member sets, >or anything in between. Yes, you're right! From V6.2 SPD, SPD uses disks, not sets. Thanks Yoshitaka