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Install device-mapper-multipath: yum install device-mapper-multipath Check udev package: rpm -q udev Load Multipath: #modprobe dm_multipath #lsmod grep multi dm_multipath 21577 0 dm_mod 56537 13 dm_multipath,dm_snapshot,dm_zero,dm_mirror

Install: package needed: 1) yum install php-mbstring (unicode lib) Process to migrate the live site: Configure the new servers to reverse-proxy Drupal requests to the old servers Switch DNS from the old load balancer to the new one. Put the site in read-only mode just long enough to transfer the database Do a final database load on the new DB server

On Linux : iostat (IO status) vmstat (Memory) mpstat (CPU) mpstat -P ALL (all cores CPU) top sar Top 10 CPU uage: ps -eo pcpu,pid,user,args sort -k 1 -r head 10 or ps -eo pcpu,pid,user,args sort -r -k1 less who is using the CPU ps -e -o pcpu,cpu,nice,state,cputime,args –sort pcpu sed ‘/^ 0.0 /d’ check CPU: cat /proc/cpuinfo less /proc/interrupts ls /sys/devices/system/cpu

1> Rename the zone (not rename the server name) a> shutdown the zone : # zoneadm -z halt b> Change the configuration: # cd /etc/zones # mv .xml .xml # vi .xml # cd /export/zones # mv c> Boot the zone: # zoneadm -z boot 2> Change the server name: (two ways to do it) a> during the zone up b> during the zone down # cd /export/zones/ /root # vi /etc/hosts # vi /etc/nodename # vi /etc/hostname. more info: http://www.softpanorama.org/Solaris/Virtualization/zones.shtml

How to create Solaris Zone 1> Created a Zone Home directory mkdir -p /export/zones/ 2> Change premission chmod 700 /export/zones/ 3> Configure the the Zone zonecfg -z (in our case, we call the zone_name as sunrmg zonecfg:sunrmg> create zonecfg:sunrmg> set zonepath=/export/home/sunrmg zonecfg:sunrmg> add net zonecfg:sunrmg:net> set address=xxx.xxx.xxx.xxx zonecfg:sunrmg:net> set physical=ce0 zonecfg:sunrmg:net> end zonecfg:sunrmg> set autoboot=true (The above information is sufficient to configure a basic zone, with most software shared from the global zone. Other options could have been used, for example to inherit parts of the Global zone's file system, mount directories (e.g. /software) from the Global zone, restrict the zone's resources (e.g. CPU, memory)) zonecfg:sunrmg> info zonepath: /export/zones/sunrmg autoboot: true pool: inherit-pkg-dir: dir: /lib inherit-pkg-dir: dir: /platform inherit-pkg-dir: dir: /sbin inherit-pkg-dir: dir: /usr ne...

Understanding your (Red Hat Enterprise Linux) daemons by Len DiMaggio A Unix daemon is a program that runs in the “background,” enabling you to do other work in the “foreground,” and is independent of control from a terminal. Daemons can either be started by a process, such as a system startup script, where there is no controlling terminal, or by a user at a terminal without “tying up” that terminal as the daemon runs . But which daemons can you safely play with? Which should you leave running? An introduction to daemons The real-world (i.e., non-computer) definition of “daemon” is either a spirit (an evil one) or an inner or private voice. It’s interesting to note that each of the real-world definitions actually does apply to Unix daemon programs. Like mythological daemons, Unix daemon programs skulk around unseen in the background just as a daemon would. And daemons act like an inner voice in that they can run continuously and, like a conscience, can always be accessed. The word “dae...

Solaris 10 does support FB SAN; but not on SCSI. To enable it, edit the /kernel/drv/fp.conf file. mpxio-disable="no"; Below is an example of a host which has two fibre channel controllers (c4 and c5) connected to the sam SAN, and both see the same target LUNs, of which there are four: cfgadm -al -o show_SCSI_LUN So, the aforementioned scsi_vhci driver sees that LUN 6000393000015463,0 is presented by two controllers. It will then make a new disk device using that device’s WWN, LUN, and other information to construct a globally-unique ID (GUID) device name and then create device entries under /dev/dsk and /dev/rdsk to represent a multipathed view: You might notice the new controller, c6. This is a “virtual” controller implemented by scsi_vhci since making such virtual disk devices under a real physical controller would be a broken idea since, technically, there is no such physical device. Remember, this is a meta device.