Here i would like to share small piece of information about dtrace. I have used dtrace to find which process are making more system calls (i.e kernel usage). DTrace is very useful d to get the amount of memory, CPU time, filesystem and network resources used by the active processes. It can also provide much more fine-grained […]
Solaris 10
Solaris OS and veritas patching procedure with VCS
We have seen many post about Solaris 10 OS patching using Liveupgrade method.Here we are going to see traditional OS patching where your root filesystem is UFS.The setup which i took is some what complex one. Here the global zone is part of veritas cluster and couple of zones are controlled by VCS and one zone is non-cluster.Here the root […]
Preventing zone core files on Global zone -Solaris
Coredump is memory dump of program or application and its generates when application crashes or terminated abnormally.This coredump is very useful to find root cause of application crashes.But sometimes it will create a problem by filling the root filesystem if /var/core is part of root filesystem and again all the local zones core files will be dump in global zone’s […]
Solaris 10- OS patching using Live-upgrade
Solaris OS patching has been moved far away from the traditional methods from Solaris 10 on-wards.We no need to bring down the server to single user mode if you are using live upgrade method during pathing and before choosing live upgrade ,make sure you are using ZFS as a root filesystem.For you information,from Solaris 11 onward,ZFS will be the default root filesystem. In other-words, […]
DF command shows incorrect usage in VXFS
I have observed “df -h”command will show that veritas filesystems is used so and so space, but actually if you go to that mount point and calculate disk space using “du -sh” there will be nothing. In few cases, when df command will not show the correct usage of the filesystems. Also,if the filesystem created […]
Oracle Solaris – UFS to ZFS Migration Using Live upgrade (root FS)
How to migrate the Solaris root filesystem from UFS/SVM to ZFS on Oracle Solaris 10 ?. From Solaris 10 on-wards ZFS filesystem supports root FS. If you are already having the root filesystem in UFS, you can easily convert it using Live upgrade with minimal downtime. The actual down time is just a single reboot. […]
Solaris ZONE + Liveupgrade compatibility model –Solaris 10
Using ZFS as root filesystems on global zone and local zone is huge advantage for OS patching. ZFS is very flexible with Liveupgrade, so that rollback action is very simple. It’s Just reboot. Here we will see what type of zone+zfs configuration will support in Solaris 10 for Liveupgrade. If you are planning to use […]
Oracle server-Virtualization Technologies
OS Virtualization is a hot topic in the IT market.All the operating system developers and OEM are keep on introducing new virtualization technologies day by day. Have you ever asked why is it so import in infrastructure management ? Operating system virtualization very important to reduce the hardware cost and isolates the applications from server. In older days ,if you want to port the […]
Solaris 10’s Resource Management:Controlling process using projects
in older days we use to set the kernel tuneable parameters through /etc/system in Solaris Boxes.But from Solaris 10 on-wards,we set those parameters using resource control mechanism.The rctladm command allows you to make runtime interrogations of and modifications to the resource controls facility, with global scope. The prctl command allows you to make runtime interrogations of and modifications to the resource controls facility, with […]
Solaris 10’s Resource Management and Shell Limit(ulimit)
Solaris 10’s Resource Management One of the best known features in Solaris is Resource management. This mechanism allows controlling resource for each and every process which is big advantage in system administration.System precious resources like CPU & memory also can be controlled by using projects and newtask feature. Resource Management:A resource controls are identified by […]