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Operating Systems AIX AIX 5.3 MPIO vs RDAC on DS4000 range Post 302244831 by shockneck on Wednesday 8th of October 2008 04:55:49 PM
Old 10-08-2008
Quote:
Originally Posted by dig1tal
[...] we are running sddpcm on ds4700/ds4300 behind the svc. it works quite well and we've noticed considerable performance gains in I/O. [...] before the svc, we were using rdac with active/passive on the ds4000.
Interesting setup but still no load-balancing. Do you use other san storage beside the DS4K or what else is the reason for using SVC?
 

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SG_RDAC(8)							     SG3_UTILS								SG_RDAC(8)

NAME
sg_rdac - display or modify SCSI RDAC Redundant Controller mode page SYNOPSIS
sg_rdac [-a] [-f=LUN] [-v] [-V] DEVICE DESCRIPTION
sg_rdac displays or modifies the RDAC controller settings via the Redundant Controller mode page (0x2C). When modifying the settings it allows to transfer the ownership of individual drives to the controller the command was received on. OPTIONS
-a Transfer all (visible) devices -f=LUN Transfer the device identified by LUN. This command will only work if the controller supports 'Dual Active Mode' (aka active/active mode). -v be verbose -V print version string then exit EXIT STATUS
The exit status of sg_rdac is 0 when it is successful. Otherwise see the sg3_utils(8) man page. AUTHOR
Written by Hannes Reinecke <hare at suse dot com>, based on sg_emc_trespass. REPORTING BUGS
Report bugs to <dgilbert at interlog dot com>. COPYRIGHT
Copyright (C) 2006-2012 Hannes Reinecke, Douglas Gilbert. This software is distributed under the GPL version 2. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR- POSE. sg3_utils-1.35 November 2012 SG_RDAC(8)
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