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Operating Systems HP-UX What is the difference between DRD and Root Mirror Disk using LVM mirror ? Post 302755769 by vbe on Monday 14th of January 2013 10:02:50 AM
Old 01-14-2013
You cannot really compare...
LVM mirroring (MirrorDisk/UX) is using permanently 2 disks, so if any of the two fail you have your system still running...
DRD, is a cloning utility letting you be ableto clone your root disk and modify the clone... you can boot from...
The diference is if your root disk fails, your system will crash... but yes you reboot on the clone after, but in mirror/UX there is no non planified downtime and if you are using hot swap disks, there is no downtime at all...
Now if you are testing updates you see the difference: in mirror/UX you cannot come to a previous situation since both disks are affected unless you brake the mirror...
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advfsd(8)						      System Manager's Manual							 advfsd(8)

NAME
advfsd - Starts the AdvFS graphical user interface (GUI) daemon SYNOPSIS
/usr/sbin/advfsd DESCRIPTION
The AdvFS daemon, advfsd, is a process required by the AdvFS GUI (dtadvfs). The advfsd daemon issues commands and obtains system information on behalf of the AdvFS GUI. The /usr/var/advfs/daemon/socket/hosts.allow file contains a list of all hosts on which the advfsd daemon will allow the AdvFS GUI to run. This file can be edited to add or remove hosts. Each host name must be on a separate line. For example: host1 host3 host27 The /usr/var/advfs/daemon/socket/gui.passwd file, if it exists, is used by advfsd to force a dtadvfs user to enter a unique password when attempting to connect to the host. The first line of this file is the unique password required by the GUI. For example: guipassword For security reasons, do not use the password of the root user or any other user; make up a unique name and do not encrypt it. The advfsd daemon allows Simple Network Management Protocol (SNMP) clients such as NetView or Performance Manager (PM) to request AdvFS file system information. SNMP clients cannot issue system configuration commands to the advfsd daemon. The advfsd daemon is automatically started at boot time. Under normal conditions, this daemon does not need to be run manually. If you do not want to have the daemon started at boot time, move the /sbin/rc3.d/s53advfsd file from its default location to another directory and run it from that directory. Whenever you want to run the daemon at boot time, move the s53advfsd file back to the /sbin/rc3.d directory. The daemon (called an agent in the dtadvfs GUI interface) employs a file, /usr/var/advfs/daemon/disks.ignore, in which you can place the names of disks that the daemon will ignore when it gathers information about disks on the system. If you use the disks.ignore file, you can improve the performance of the dtadvfs GUI. Each line in the disks.ignore file contains the name of a disk (with no directory partition letter) to be ignored by the daemon. For example, to cause the disks /dev/disk/dsk3d and /dev/disk/dsk2g to be ignored, enter the following names on separate lines in the file: dsk2 dsk3 You cannot ignore an LSM volume by including the LSM volume name in the disks.ignore file; you must list the disks from which the LSM vol- ume is built. To ignore a complete disk group, you must list all the disks in it. Because all partitions on the listed disks will be ignored, unexpected results may occur if a disk has partitions belonging to more than one disk group. The disks.ignore file is processed each time the disks are checked. This means that if a disk fails or becomes unavailable, you can add the disk name to the disks.ignore file and the daemon will ignore it. Once the disk is available, remove the entry from the file. There is no need to stop the daemon. For more information, see the GUI interface reference page , dtadvfs(8). RESTRICTIONS
Only one advfsd daemon can be running on a system at a given time. If a second advfsd daemon attempts to start, it will fail. You must be the root user to use this utility and you must register the Advanced File System Utilities license. FILES
The script that starts the advfsd daemon at boot time. The advfsd message catalog. The SNMP data files. The sh scripts used by the dae- mon to execute commands. The advfsd daemon executable. The advfsd daemon message log file. Remove or copy this log to another location periodically to prevent the log from becoming too large. The security file that lists all hosts with permission to connect to the advfsd daemon with the AdvFS GUI (dtadvfs). The advfsd password file. The file that lists all disks for the advfsd daemon to ignore when col- lecting statistics about resources. SEE ALSO
advfs(4), dtadvfs(8) advfsd(8)
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