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Operating Systems AIX LPAR freezes after switching of storage (lpar is mirrored) Post 302503470 by markiemark on Thursday 10th of March 2011 04:10:30 PM
Old 03-10-2011
LPAR freezes after switching of storage (lpar is mirrored)

Hi all,

I have the following configuration

2 ds3524 storage disk systems located over 2 locations
2 P720 server located over 2 locations

DS3524 are connected to san switch.
Each vio server has 1 fc adapter attached to a san switch.

per p720 server 2 virtual io servers. Vio 1 has 1 lun from 1 ds3524, Vio 2 has 1 lun from the other ds3524
On the lpar we use LVM mirroring.

The problem:

When we halt 1 DS3524 the lpar freezes for about 30 seconds and then is again available.
Is this normal behaviour? When i shutdown 1 vio server , everything on the lpar is ok , no freeze.

Any ideas ?

thx MarkieMark
 

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TGT-ADMIN(8)						      TGT Configuration Tool						      TGT-ADMIN(8)

NAME
tgt-admin - Linux SCSI Target Configuration Tool. SYNOPSIS
tgt-admin -[OPTION]... DESCRIPTION
tgt-admin is a utility which allows a persistent configuration of targets and luns. It uses tgtadm commands to create, delete and show targets. OPTIONS
-e, --execute read /etc/tgt/targets.conf and execute tgtadm commands. if target already exists it will be deleted and a new instance will be created with the new parameters instead. -d, --delete delete all the targets -s, --show show all the targets -f, --force don't exit on tgtadm errors -p, --pretend only print tgtadm options -v, --verbose increase verbosity (no effect in "pretend" mode) -c, --conf <conf_file> specify an alternative configuration file instead of /etc/tgt/target.conf, which is the default. -h, --help display a list of available options and exits CONFIGURATION FILE SYNTAX
The defualt configuration file is: /etc/tgt/target.conf. It defines all the targets and their properties. The configuration file is in XML format and uses tags. Configuration file contains several target blocks, where each block contains tar- get's proerties such as storage devices, initator ACL and authorization information. You can include other config files using: include /etc/tgt/xen/*.conf. There are 2 types of storage devices: backing-store - defines a virtual device on the target. direct-store - defines a direct mapped device with the same properties as the physical device (such as VENDOR_ID , SERIAL_NUM, etc.) initiator-address - allows connections only from the specify IP address. defaults to ALL if no "initiator-address" is specified incominguser - define iscsi incoming authentication setting. if no "incominguser" is specified, it is not used. outgoinguser - define iscsi outgoing authentication setting. if no "outgoinguser" is specified, it is not used. example for a configuration file: <target iqn.2007-04.com.example:san.monitoring> backing-store /dev/san/monitoring # if no "incominguser" is specified, it is not used incominguser backup secretpass12 # defaults to ALL if no "initiator-address" is specified initiator-address 192.168.1.2 </target> <target iqn.2007-02.com.example:san.xen1> backing-store /dev/san/xen1-disk1 # LUN1 direct-store /dev/san/xen1-disk2 # LUN2 initiator-address 192.168.1.2 # Allowed IP initiator-address 192.168.5.6 # Allowed IP incominguser user1 secretpass12 incominguser user2 secretpass23 outgoinguser userA secretpassA </target> <target iqn.2007-02.com.example:san.xen2> backing-store /dev/san/xen2 </target> <target iqn.2007-06.com.example:san.vmware1> backing-store /dev/san/vmware1 </target> FILES
/etc/tgt/target.conf Configuration file for tgt-admin. SEE ALSO
tgtadm(8) REPORTING BUGS
Report bugs to <stgt-devel@lists.berlios.de> TGT Configuration Tool 2008-07-21 TGT-ADMIN(8)
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