It applies to solaris 10, but it deals with adding swap space to a zfs disk and should be valid for solaris 11. Topics are described for both sparc and x86 based systems, where appropriate. Now i need to increase the swap space and i cant add a swap file, like was possible under ufs. Go to virtualbox website here to download the binary for your current operating system. Playing with swap monitoring and increasing swap space. Paging is an important part of virtual memory implementations in modern.
When the swap space requirements of the system exceed the current swap space available, you can use the following procedures to add additional swap space to your system. How to add swap space on debian 10 buster devconnected. Appendices list the product packages, the required patches, and the. In computer operating systems, paging is a memory management scheme by which a computer. Adding or changing swap space in an oracle solaris zfs root environment oracle solaris 11. Adding more swap space system administration guide. This is straight out of the man pages, but i had a hard time finding it the first time that i needed it. How to add new swap in solaris 10 on fly july 11, 2012 by lingeswaran r 1 comment rarely we may pushed in a such a situation to add the additional swap space while system is in production. If you have a solaris system that badly needs more swap but you dont have a free swap device available, you can create a file in the file system and add it as additional swap. We have a sparc system which is running on solaris 9 and physical memory size is 16gb. Adding swap space to solaris zone without rebooting adding swap space to solaris zone. To ensure crash dump files are complete, follow the table to determine the swap space size.
On my solaris testing machine swap1 file was already created which is currently in used. In above example, swap l command used to check the existing swap size space, you can use top command as well but using top command you can not find which swap named file are in used. These two factors often give rise to confusion and misinterpretation of the. I had an interesting discussion with 2 colleagues about the possible interest of putting the swap space of a system on a ssd. Below are the examples to add the new swap space and swap file. Oracle db on solaris utilizing swap memory when free ram. The simple answer is to add more swap space, staring with a new disk to host the swap space. The system has ram free, so its barely dipping into swap space, with about 400 meg being used. These commands, described below, enable you to add more swap space without repartitioning a. If i consider the gain in latency that an ssd brings versus a capacity disk in the region of 100x the solution seems obvious. Until a permanent solution is available, a file can be constructed and added to the swap space.
Im having a tough time understanding swap space on solaris 10. How much swap do you allocate for your solaris server. Check automount and make permanent options and click ok button. To make changes permanent add the following line to etcnf. The installer will activate the swap partition as early as possible in. Run the following commands to increase the swap memory of a zone without reboot. Hello, i have given 3 x 1 tb luns to add more swap space in a solaris 11. Swap area changes made from the command line are not permanent and are lost after reboot. As system configurations change and new software packages are installed, you might need to add more swap space. If you are running another unixlike system, you could use it to install ubuntu without using the. It is reserving swap on an operating system where swap and ram are combined into one virtual memory pool.
Portions of the virtual memory are reserved as swap space. The swap command provides a method of adding, deteting and monitoring the swap areas used by the kernel. Swap space adding and removing in solaris 10 blogger. Swap space is used as virtual memory storage areas when the system does not have enough physical memory to handle current processes. Solaris swap space and virtual memory softpanorama. In this case, enlarge the swap space or the device of the crash dump file with the dumpadm1m command. A greater amount of swap space may be required for the memory image, depending on how the system has been used at the time of the system crash. With help to following steps you can add the swap space in ufs of solaris 10 following techniques are recommended to add additional swap space in ufs file system. For database server such as oracle or mysql i suggest you set a swappiness value of 10. See the previous sections to determine if your system or applications need additional swap space. Swap space on solaris should be configured based on expected usage of the machine. Addremove swap space in a zfs environment syscookbook. How to add swap space to solaris zone without reboot.
The memory image is written once in the swap space listed first in the etcvfstab file. One step to temporarily change hostname in solaris10. Follow the steps below to add swap space to a solaris system, this example is taken from a solaris 10 system. The post describes 3 ways to add swap space to linux systems. Reserving swap just exhausts the disk based swap area for no reason and should not be doing this at all. I installed solaris 10 0509 on a machine and i used whatever the default swap space setting when i built the box. Ubuntu linux create and add swap file tutorial nixcraft. To create a permanet swap are you need to add in the etc vfstab file. A rough comparison would be a highwatermark threshold.
Add swap space to solaris 10 posted by robert auch under howto, unix tags. To make a 250mb addition to swap space using the var filesystem, run as root. Devices and file systems above oracle document states that you can expand your swap from rpool. The only caveat is that i am running the 32 bit version of solaris 10, which has a limitation on maximum swap size of 2 gb. The easiest way to add more swap space is to use the mkfile and swap commands to designate a part of an existing ufs or nfs file system as a supplementary swap area. Solaris uses the memory as tmp and swap will be calculated along with physical memory. To determine the amount of swap space installed on your system, enter the following command. Adding or changing swap space in an oracle solaris zfs root environment the following section describes how to add or change swap space in a zfs root environment. Open solaris prstat basically this means that the value includes memory that is currently not accessed yet but is mapped into the address space of a process. The first method to add swap space on debian is to use a dedicated swap file many tutorials are not specifying this detail, but swap files cannot contain any holes at all it means that you should not use the cp command to create your swap file it is also not recommended to use the fallocate commands on file systems that support preallocated files such as. Note that the available swap space in the output of swap s command includes the amount of free physical memory. Sometimes swap space is inadequate, but no free disk slices are available. You can find only total swap memory available on the solaris server. Edit the etcvfstab file to add information describing the swap slice.
The decreased need for physical swap space occurs because the swapfs file system provides virtual swap space addresses rather than real physical swap space addresses in. If this will be a permanent swap area, add to the etcvfstab file an entry for the. Adding swap space to solaris zone without rebooting. All transitioning between ram and swap is handled by the solaris os itself. Such memory may be used in the future, and thus may be swapped out i. It also gives instructions on installing the required operating systems patches. Because of the virtual swap space provided by the swapfs file system in the solaris 10 os, there is less need for physical swap space on systems with a large available memory. Adding or changing swap space in an oracle solaris zfs root.
As a workaround,we will add additional swap space to avoid the system hungpanic. Sometimes you have to add additional swap space when the current swap space is not sufficient. How to find the exact memory and swap usage of solaris server. The book covers a range of oracle solaris system administration topics related to. Adding or changing swap space in an oracle solaris zfs. Get the latest tutorials on sysadmin, linuxunix and open source topics. Sometimes due to applications,system may in to memory bottle neck.
If i need to increase swap space in a particular zone, i need to add swap to the entire system. The value of usage of swap in both the cases is different, in zfs list command the value of swap usage is 1. In oracle solaris 10, the default location for the primary swap space is slice 1 of the boot disk which by defaults starts at cylinder 0. The easiest way to add more swap space is to use the mkfile and swap. Replace with the name which you like to give your server this command will change your servers hostname temporarily. If the memory image is larger than the swap size, the crash dump file cannot be taken. However, there is not enough space in my rpool to do it. Adding swap space on a solaris system oracle solaris. How much swap space is currently used by the system. How to add new swap in solaris 10 on fly unixarena.
I added a 2gb thinprovisioned disk to the esx vm, rebooted it, then ran the following. From the second drive, only 5 gig of the 15 gig is made available to swap, so add the 10 gig from the first drive, 15 gig for swap is allocated. Run the fdisk or parted utility to identify disks with sufficient unused unpartitioned disk space. So if you have a hard drive that is larger then 2 gb, you need to partition the drive into multiple 2 gb slices. As a workaround,we will add additional swap space to avoid the. Guest additions software provide additional capability to a guest virtual. You might have to add swap space to your system if it does not have enough swap space or if recommended by your software application vendor. You can either use a dedicated hard drive partition to add new swap space, or create a swap file on an existing filesystem and use it as swap space. After activating the swap,if you want to make it permanent then make sure you have added entry in vfstab for zfs swap. Note that virtualbox will create a swap partition with the same amount space as base. Between 2049 mb and 8192 mb equal to the size of ram.
Swap space adding and removing in solaris 10 a systems virtual memory is a combination of ram and disk space. My main solaris development system has 16gb of ram, 16gb of swap, and i wish i had more of both but then im dealing with problem sets that are best categorized as freakishly huge. On solaris, you can, on the fly, remove swap devices with the swap d command or add them with the swap a command. The following section describes how to add or change swap space in a zfs.
Home solaris 10 how to add new swap in solaris 10 on fly. As covered in adjusting the sizes of your zfs swap and dump devices, first add another swap volume. We have a sparc system which is running on solaris9 and physical. We have allocated 32gb swap space 2 times of physical memory. We need to use the right commands to figure out the utilization of both. I would like to know what the size of the swap partition on the hard drive is and am concerned that these numbers are including physical memory in their calculations. From this command output, we can see the following. The package creates the nagios usergroup, installs files to usrlocalnagios, creates the solaris service, registers the existing ssl. Swap files can be used when you need to add swap space and do not have a free. If the system crashes, the memory image in the swap space is copied as a crash dump file under the varcrash hostname.
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