Sponsored Content
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...
This User Gave Thanks to vbe For This Post:
 

9 More Discussions You Might Find Interesting

1. Solaris

ZFS Mirror versus Hardware Mirror

I've looked a little but haven't found a solid answer, assuming there is one. What's better, hardware mirroring or ZFS mirroring? Common practice for us was to use the raid controllers on the Sun x86 servers. Now we've been using ZFS mirroring since U6. Any performance difference? Any other... (3 Replies)
Discussion started by: Lespaul20
3 Replies

2. Solaris

OBP - root / mirror disk syntax

Hi all Can someone explain to me the different syntax regarding how root / mirror disks are represented. I never truely understand the namely / device tress etc. Let me give you an example. On one my my servers, the root and mirror drives are :- A domain on a sunfire 6800 :- ... (6 Replies)
Discussion started by: sbk1972
6 Replies

3. Solaris

Mirror the root disk

Hi all I wish to mirror for the root disk, but last time i do, make the server cannot boot up. :p So this time, hope you guys can assist me on it. =) At the last code, is the step i wish to do. Please help to check and correct me if got any wrong. root@leo # format </dev/null Searching for... (17 Replies)
Discussion started by: SmartAntz
17 Replies

4. Linux

LVM - break mirror taking out orignal copy

Hi Guys, I have a mirrored LVM volume, and wish to break the mirror leaving only copy1 (effectively removing copy 0). Here's the config: # lvs -a -o +devices lvdata vg01 mwi-ao 2.19T lvdata_mlog 100.00 lvdata_mimage_0(0),lvdata_mimage_1(0) vg01... (0 Replies)
Discussion started by: badoshi
0 Replies

5. UNIX for Advanced & Expert Users

LVM mirror creation problem

I apologize is this isn't an appropriate post for the 'advanced' UNIX, so please let me know if I should post this under UNIX for dummies, but here's my problem in a nutshell: I having problems creating a mirrored logical volume. I have created two new physical volumes ... (2 Replies)
Discussion started by: simonrodan
2 Replies

6. AIX

Script Checking LVM Mirror not Working

Hi, I need to know who can I create an script in order to check server mirror in AIX. I got this script !/usr/bin/ksh # # Check if a VG is mirrored. # # lsattr -El <lvname> -a strictness -a copies # If copies=2 and scrictness=y, then VG is mirrored # # LVs are retrieved via 'lsvg -l... (5 Replies)
Discussion started by: fede_mont
5 Replies

7. HP-UX

Patch PHKL_31216 and PHCO_30698 HP-UX 11.11 for replace a LVM mirror boot disk

Hi, I have old server hp rp 3440 hp-ux 11.11. One mirrored disk is faulty. I need spesial patch PHKL_31216 and PHCO_30698, which give to correctly remove disk. Unfortunately I don't have access to hp support site. Please help me find it patch. regards,Andre (0 Replies)
Discussion started by: andre9
0 Replies

8. Linux

Centos 7.2 Convert single LVM to RAID Mirror Reinstall BootLoader

Hello, I am trying to convert a single-drive Centos 7.2 installation with LVM into a two-disk mdadm mirror with mrrored LVM. I was able to follow the excellent instructions at: http://www.dgoradia.com/creating-a-raid1-mirrored-on-an-existing-centos-on-lvm/and did create a two-disk mirror... (1 Reply)
Discussion started by: Clovis_Sangrail
1 Replies

9. Solaris

Mirror root disk - V490

Got a V490 with one existing root disk. Other disk slot was never populated. Want to ensure we've got disk mirroring. Currently vfstab mounts the physical disk - no mirroring set up. Whats best way to achieve this without losing current disk? (1 Reply)
Discussion started by: psychocandy
1 Replies
reboot(8)						      System Manager's Manual							 reboot(8)

NAME
reboot - Restarts the machine SYNOPSIS
/usr/sbin/reboot [-dlnq] DESCRIPTION
When the system is running and multiple users are logged in, use the shutdown -r command to perform a reboot operation. If no users are logged in, use the reboot command. The reboot command normally stops all running processes, syncs the disks, logs the reboot, and writes a shutdown entry in the login accounting file, /var/adm/wtmp. The reboot command uses the sync call to synchronize the disks, and to perform other shutdown activities such as resynchronizing the hard- ware time-of-day clock. After these activities, the system reboots. By default, the system starts and the file systems are automatically checked. If the start-up activities are successful, the system comes up in the default run-level. You must have root privileges to use this command. Using the -n flag can result in file system damage. FLAGS
Generates a crash dump of the system before halting it. Can be used with any of the other flags. Does not log the reboot using syslog Does not sync the disks or log the reboot using syslog Performs a quick reboot without first shutting down running processes; does not log the reboot using syslog EXAMPLES
To enable the default reboot action, enter: reboot This command causes the system to stop all running processes, sync the disks, log the shutdown, and perform other routine shutdown and reboot activities. To shut down the system without logging the reboot, enter: reboot -l This command shuts down the system and performs all shutdown and reboot activities, except logging the shutdown. To reboot the system abruptly, enter: reboot -q This command reboots the system abruptly without shutting down running processes. FILES
Specifies the command path Specifies the login accounting file Specifies the path of the syslog daemon RELATED INFORMATION
Commands: fsck(8), halt(8), init(8), savecore(8) shutdown(8), syslogd(8) Functions: reboot(2), sync(2), syslog(3) delim off reboot(8)
All times are GMT -4. The time now is 04:50 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy