How to add new swap in solaris 10 on fly unixarena. Reserving swap just exhausts the disk based swap area for no reason and should not be doing this at all. Here is the procedure we followed to modify the kernel parameters on solaris 10 oracle 10. Just run something like vmstat 10 10 during reference and peak periods 10 samples every 10 seconds and post the output. Adding more swap space system administration guide. This used to be a common practice, but it is now considered a bit antisocial, since it makes it impossible for an adminstrator to deal. Adding or changing swap space in an oracle solaris zfs. To create a permanet swap are you need to add in the etc vfstab file. How can i calculate my total size of swap space in solaris. Swap space issue in solaris solutions experts exchange. Swapoff only disables swap for the currently running system, to make it permanent you should combine it with removing the relevant entry from etcfstab. If i need to increase swap space in a particular zone, i need to add swap to the entire system. Jul 11, 2012 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.
On rare occasions, there might be a need to increase your systems swap space via a local files on your filesystem. How do i see virtual memory statistics including used and total swap space. Now you should modify the partition table and extend your main filesystem if you want to reclaim the unused space. Planning for swap space oracle solaris administration. Filesystem kbytes used avail capacity mounted on devdskc0t0d0s0 6196110 5612522 521627 92% devices 0 0 0 0% devices ctfs 0 0 0 0% systemcontract proc 0 0 0 0% proc mnttab 0 0 0 0% etcmnttab swap 2305496 1064 2304432 1%.
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. Why youre monitoring solaris virtual memory wrong logicmonitor. For example, large applications such as computeraided design simulators, database management products, transaction monitors, and geologic analysis systems can consume as much as 200 mb of swap space. The value of usage of swap in both the cases is different, in zfs list command the value of swap usage is 1. Be careful, swap space is handled differently between linux and solaris. I built a stock solaris 10 vm in the lab a few weeks ago. 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. However, this should only be done for a temporary situation. How much swap space to add for oracle database on linux.
As i am new to to this solaris can anybody help me out. Removing a swap file from use system administration. Delete a swap file from the current swap configuration. Swap space adding and removing in solaris 10 blogger. For oracle 11g database, the following is the recommendation from oracle in terms of how much space space you should add. Or, if the swap space is on a separate slice and you are sure you will not need it again, make a. Not enough space solaris 10 by default places tmp on swap. Adding swap space on a solaris system oracle solaris.
Solaris swap space and virtual memory softpanorama. Solaris 10 os patching using liveupgrade unixarena. See the previous sections to determine if your system or applications need additional swap space. The best super all in one clear cache, buffers and swap file in one go. Some of the servers does not have the top command and i do not have access to run zone level commands either like zonecfg. This time however i cannot delete or move files on this disk. Recover the disk space so that you can use it for something else.
As you probably know, the solaris operating system uses the badly worded swap space to designate the virtual swap space of a unix process, which is to differentiate from the physical swap space which represents the disk or file swap device. Adding or changing swap space in an oracle solaris zfs root environment. I used swap l and swap s, but i am thinking that, i am getting some wrong result. This can lead to trouble, run out of physical ram, and new processes may not start. Sparc based systems maintain one partition table on each disk. 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. This is good for speed, but not so good on a general purpose box where some applications may fill up tmp. Ufsunix file system is the default file system for solaris. I do not have the top command available and neither prstat nor swap seem to be able to provide information about how much swap space a given process is using. Verify your swap space with swap l and check adding swap space on solaris. I tried to boot from a live gparted cd, but i kept getting an error, so i ran gparted in ubuntu. Bu solaris has a very elegant idea of linking swap space and tmp. Playing with swap monitoring and increasing swap space using. Interesting use case of solaris swap space blogo thnet.
I had an interesting discussion with 2 colleagues about the possible interest of putting the swap space of a system on a ssd. The swap thing in particular is a bit frustrating, because ultimately id like to be able to remove a failing drive from a freenas system and replace it without a reboot, but the existence of swap on the drive may mean that the system is headed for a panic, or userland bits are headed towards their doom, when those pages cannot be swapped back in. How to add swap space in an oracle solaris zfs root environment. This is straight out of the man pages, but i had a hard time finding it the first time that i needed it. Oracle db on solaris utilizing swap memory when free ram. Procedure how to remove unneeded swap space oracle docs. The directory is a directory in which you have permission to add swap space. It also gives instructions on installing the required operating systems patches.
The book covers a range of oracle solaris system administration topics related to. Use a hard drive partition for additional swap space. Addremove swap space in a zfs environment syscookbook. The swap command provides a method of adding, deteting and monitoring the swap areas used by the kernel. In other words tmp in solaris is memory based filesystem and files in it disappear on reboot. Sometimes due to applications,system may in to memory bottle neck.
If you have unneeded swap space, you can remove it. That means that it is important for solaris administrators to understand the features of the solaris swap. Jul 03, 2012 solaris os patching has been moved far away from the traditional methods from solaris 10 onwards. Now that our swap partition is formatted, we need to enable the swap space so run swapon command to enable it. How to remove unneeded swap space in ufs root environment. It applies to solaris 10, but it deals with adding swap space to a zfs disk and should be valid for solaris 11. So if you have a hard drive that is larger then 2 gb, you need to partition the drive into multiple 2 gb slices. Releasing the swap space solaris unix and linux forums. Unlike earlier releases of solaris, most of the system parameters needed to run oracle are already set properly, so the only one you need is the maximum shared memory parameter. The following section describes how to add or change swap space in a zfs root environment.
The most important factors in determining swap space size are the requirements of the systems software applications. However the other times that this has occured i have been able to move files to another disk to make enough space to allow the disk to operate and hence delete other files to make space. As a workaround,we will add additional swap space to avoid the system hungpanic. Here is an example on how to set up a 100mb swap file and then delete it. Right click swap partition in gparted and selected swapoff. Edit the etcvfstab file and delete the entry for the swap file. Im having a tough time understanding swap space on solaris 10. Solaris unix supports various command to get the information about. These two factors often give rise to confusion and misinterpretation of the data, especially when queried via snmp.
You can find only total swap memory available on the solaris server. Now setup this newly created partition as swap area using the mkswap command as shown below. Solaris os patching has been moved far away from the traditional methods from solaris 10 onwards. Apr 10, 2008 add another drive and set it up as swap space. I installed solaris 10 on a sun blade last month, and have used sun update manager to patch my system regularly. Solaris does not require any swap space to be configured at all. As covered in adjusting the sizes of your zfs swap and dump devices, first add another swap volume. 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. 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. On solaris, you can, on the fly, remove swap devices with the swap d command or add them with the swap a command. Oct 26, 2012 but the value of swap used in through swap l is around 0. If you fill tmp, you essentially reduce the amount of available swap to 0. On my solaris testing machine swap1 file was already created which is currently in used.
Swapping or more precisely paging must be much faster with an ssd. The swap space allocation goes through three different stages. For you information,from solaris 11 onward,zfs will be the default root filesystem. Removing a swap file from use system administration guide. Between 2049 mb and 8192 mb equal to the size of ram. You get lovely fork errors on the shell, and interesting. 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. Let us assume that this partition is called devsdc1. Apr 25, 2020 swap space can be a dedicated swap partition recommended, a swap file, or a combination of swap partitions and swap files. To determine the amount of swap space installed on your system, enter the following command. Topics are described for both sparc and x86 based systems, where appropriate. In one of our solaris sparc v9 box, we are facing issues related to swap space.
Virtual memory today consists of the sum total of physical ram and swap space on disk. How to delete files on a zfs filesystem that is 100% full. These two factors often give rise to confusion and misinterpretation of the. If i consider the gain in latency that an ssd brings versus a capacity disk in the region of 100x the solution seems obvious. The oracle solaris 11 host we are using solaris111 has the following file systemrelated components. All transitioning between ram and swap is handled by the solaris os itself. On modern hardware with 32gb memory or more swap space is rarely used for its primary purpose. To remove the added disk from swap space use the following command. Follow the steps below to add swap space to a solaris system, this example is taken from a solaris 10 system. Swap space problem on solaris 10 652656 aug 26, 2008 5. To learn details about the solaris swap space, please read. It is reserving swap on an operating system where swap and ram are combined into one virtual memory pool. Adding or changing swap space in an oracle solaris zfs root environment next.
If you are running oracle database on your environment, and having some performance issues because of memory, you may have to look at the swap space configured on your system. Verify the newly added swap space using the command below. Linux disk partitioning fdisk, parted this article discusses the disc partitioning utilities available linux, with specific reference to the information needed for the rhcsa ex200 and rhce ex300 certification exams remember, the exams are handson, so it doesnt matter which method you use to achieve the result, so long as the end product is correct. Or even better, how can i list all running processes sorted by swap space usage.
For information on mounting a file system, see mounting and unmounting oracle solaris file systems. Playing with swap monitoring and increasing swap space. Once thats done, swap should be disabled and not come back on the next boot. Note that the available swap space in the output of swap s command includes the amount of free physical memory. Alternatively to vmstat, you might prefer to run sar g 5 5 in any case, server2 seems to lack ram according to top output. After adding the fifth zone to it to host a nis domain, it started suffering out of memory errors like the following. We no need to bring down the server to single user mode if you are using live upgrade method during pathing and b efore choosing live upgrade,make sure you are using zfs as a root filesystem. As a result, when finally a working unity system was achieved, i had the original swap partition 4gb, plus 5 new 2. Appendices list the product packages, the required patches, and the. Adding swap space on a solaris system oracle solaris studio. To figure out if your servers are lacking ram, a useful metric would be the sr column in the vmstat command output.
Home solaris 10 how to add new swap in solaris 10 on fly. It is recommended that the size of your swap space should be equal to twice your computers ram, or 32 mb, whichever amount is larger, but no more than 2048 mb or 2 gb because the modern computer has ram more than 4096. Or, if the swap space is on a separate slice and you are sure you will not need it again, make a new file system and mount the file system. May 18, 2017 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. This myth is clearly a case of users who have been around since the solaris 4. Swap area changes made from the command line are not permanent and are lost after reboot.
Now that we know how to monitor the swap space, its time to learn to add space and delete disk space that is allocated to the swap area. The book covers a range of oracle solaris system administration topics related to managing. 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. Our custom applications are using swap space even though.
Sep 19, 2012 the swap thing in particular is a bit frustrating, because ultimately id like to be able to remove a failing drive from a freenas system and replace it without a reboot, but the existence of swap on the drive may mean that the system is headed for a panic, or userland bits are headed towards their doom, when those pages cannot be swapped back in. The swap filename is the name of the swap file you are creating. This means that when the program terminates, the os will automatically delete the file. If you have an additional hard disk, or space available in an existing disk, create a partition using fdisk command. The value of swap is expressed in kilobytes k, megabytes m, or gigabytes g.
1400 482 947 477 767 1481 710 1062 720 1017 253 247 778 691 1140 879 1497 8 956 21 712 1317 1506 803 836 1208 96 440 225 916 80 1265 582 486 820 967 1065 746 1082 1342