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Conference ssag::ask_ssag

Title:	Ask the Storage Architecture Group
Notice:	Check out our web page at http://www-starch.shr.dec.com
Moderator:	SSAG::TERZAN

Created:	Wed Oct 15 1986
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	6756
Total number of notes:	25276

6435.0. "Long Shadow Copy times" by WOTVAX::SPREADBURY () Fri Feb 28 1997 05:16

    
    
    
    My customer has 2 x KZPSC RAID controllers in his AlphaServer 4100
    system running VMS 6.2-1H3.
    
    He is using RAID 0 on the controllers and host based shadowing
    between controllers.
    
    During a shadow copy (system not in use) he is seeing very low
    controller I/O loading, very low disk I/O loading and only 4%
    CPU usage, yet the copy for a single RZ29 takes up to 6 hours
    during which time he is vunerable to complete system failure through
    the loss of another drive.
    
    Does anyone have any thoughts about why this is and how we might
    look at improving this
    
    Peter Spreadbury

T.R	Title	User	Personal Name	Date	Lines
6435.1	try comet search on CTI_SRC961214001065	KEIKI::WHITE	MIN(2�,FWIW)	`Fri Feb 28 1997 19:59`	5
	IPMT as there is a new SYS$DRDRIVER.EXE that will fix this problem but is not generally available yet. Bill