Swap space/dump devices for large RAM systems

We are in the process of changing our standards for our server builds and need some input. Currently, we match the swap space on local disk with the size of RAM. I know this isn't necessary for "swap" any more, but we use the swap area as the dump device as well, so we are sure to have enough space there to contain a full memory dump if the server crashes.
Now we have systems coming in with 128 or even 192 GB of ram. They contain only two disks (146GB), which we mirror. Obviously there isn't enough space on these disks for 192GB of swap or a dedicated dump deivce.
We need the ability to capture full dumps when we have a crash, probably with a dedicated dump device. Should we start ordering SCSI disk enclosuers for this purpose? Can we make a SAN volume our dump device?
What is everyone else doing with these larger RAM systems?

Compressed dumps have been supported in UNIX flavors for many years, so you need to dig further into it. It is supported in linux, so I can't imagine why it wouldn't in Solaris. Tru64UNIX, HP-UX, AIX, and others all provide this capability.
True, you can't get internal disks bigger than the 146 on Sparc platforms, but you could attach a "boot array", like a storagetek D240 system, or iScsi or fiber attached storage. The only caveat is whether Solaris, in the throes of a crash, still has the drivers loaded that can address an external disk subsystem. That would have to be investigated with SUN. And these arrays support the new 1TB SATA disk drives. We are deploying 6140 shelves with 16TB per shelf. Simply amazing...

Similar Messages

  • Swap and dedicated dump devices on 192GB RAM servers

    We are in the process of changing our standards for our server builds and need some input. Currently, we match the swap space on local disk with the size of RAM. I know this isn't necessary for "swap" any more, but we use the swap area as the dump device as well, so we are sure to have enough space there to contain a full memory dump if the server crashes.
    Now we have systems coming in with 128 or even 192 GB of ram. They contain only two disks (146GB), which we mirror. Obviously there isn't enough space on these disks for 192GB of swap or a dedicated dump deivce.
    We need the ability to capture full dumps when we have a crash, probably with a dedicated dump device. Should we start ordering SCSI disk enclosuers for this purpose? Can we make a SAN volume our dump device?
    What is everyone else doing with these larger RAM systems?

    dbsanders wrote:
    We are in the process of changing our standards for our server builds and need some input. Currently, we match the swap space on local disk with the size of RAM. I know this isn't necessary for "swap" any more, but we use the swap area as the dump device as well, so we are sure to have enough space there to contain a full memory dump if the server crashes.
    Even if you needed a "full" memory dump (which isn't the default), the image is compressed during the dump, so you still don't need the size of RAM.
    Now we have systems coming in with 128 or even 192 GB of ram. They contain only two disks (146GB), which we mirror. Obviously there isn't enough space on these disks for 192GB of swap or a dedicated dump deivce.
    We need the ability to capture full dumps when we have a crash, probably with a dedicated dump device. Should we start ordering SCSI disk enclosuers for this purpose? Can we make a SAN volume our dump device?As long as the kernel can see the device, and the driver allows it, it should be dumpable. (VxVM for instance doesn't support dumping to its volumes). Most SAN devices should work okay. Best way would be to test it. See if you can select it with 'dumpadm' and then if 'savecore -L' will honor the device. (Do not attempt to use 'savecore -L' on systems where your dump and swap devices are on the same storage!)
    What is everyone else doing with these larger RAM systems?I can't remember the last time I needed a full memory dump for troubleshooting. Most of the time I use rather tiny swap spaces (like 4G) unless a particular situation demands otherwise.
    Darren

  • Swap space becomes critically low in the system

    Hi,
    We are facing a situation where the swap space space  is critically low in the system, there is just 10 % available swap space in the system
    And we can't see the swap space being released to the OS .
    This is one of the  Application servers we have for R3 system.
    SAP environment:
    SAP Netweaver 7.01
    LINUX RHEL
    Oracle 11g
    $free -m //outut
    As you can see we have 64G physical memory allocated to this application server whereas the configured swap space is around 20G.
    This Linux box houses two application server one for R3 and the other for CRM.
    Would appreciate if you can tell me what should be done to release the swap space as above shows that 18 gig of 20 is being used right now.
    Regards,
    Rakesh

    Thanks Gaurav..
    what you have said makes sense we will check that parameter which determines to what extent swap space should be used between 0 to 100 %.
    However, I have found that there are many swaps in the SAP buffer (ST02) that we will be tuning soon in both of the application servers that I had mentioned above,
    I have checked the ST06 and couldn't found any page in/out activity.
    see below the screen shots of  ST02 and ST06 for both application servers.
    Regards,
    Rakesh

  • ConfigTool Settings for 1GB RAM System wanted

    Hi,
    I have done a standalone J2E SR1 installation. The Central insance doesnot come up after restarting the server. The jcontrol.exe shows "Some processes running" with an yellow flag next to it. I know that the config tool settings have to be changed. Can somebody provide me with these setings for a 1GB RAM system.
    It will be much appreciated if there are any docs/ notes on how to set the values in Config Tool.
    Cheers,
    Siva Maranani.

    Hi Siva,
    Please go through this link
    /people/thomas.jung3/blog/2005/05/31/microsoft-cluster-server-and-netweaver-04
    Also make sure loopback adapter is created or network is up.
    Cheers,
    Vivek

  • On iOS 8 and "old" device for the operating system. О iOS 8 и "Старых" устройствах на этой операционной системе

    USA.
    Good day! I like you a fan of the forum users of APPLE. I live in the Russian Federation. Began his acquaintance with this company back in 2010 with the Ipad 2 device was still on ios 5. In January 2014 I made ​​a gift and bought the iPhone 5s on OC IOS 7. I bought it at the official Russian official price that more accurately put Apple in 1100 $. In our country, it is a lot of money. With the money I could live for 3 months. In fact, I became the owner of a top (at the time) from a favorite device of Apple. My iPhone 5s worked perfectly on ios 7. sometimes met friezes light animation, and non-critical bugs, but who is without sin? Favorite company I was willing to forgive it because I see that she is trying to be better and not standing still. Looking WWDC presentation which provided us with iOS 8 you assured me that everything was better, faster, more functional. I was determined that update my iPhone 5s to iOS 8.0 ... APPLE releases new OC iOS 8 ... And I live! Behind the beautiful words that we said at the presentation of the great features of the new iOS hiding "something." And that "something" turned my phone in ... "pumpkin"! Yes! In that same stupid pumpkin! And now I will explain why I think it's pumpkin, not rose.
    Sea bugs ... and they are awful and terrible as it does not give me the full extent of my work enjoy iPhone 5s!
    Start from the beginning:
    1 Streaming through technology "Air play".
    "Air play" ceased to function properly! He was often disconnected from Apple tv and Apple airport express last generation. Apple tv 2g can not receive the signal from my iPhone 5s! And when it's all the same he gets a video playback does not last long, it just breaks and does not connect again! Helps to restart Apple TV and a hard reset by holding the button "HOME" button and "POWER". On the "Apple TV" is worth the latest firmware as these problems are manifested in the previous firmware of the device.
    2 Built-in browser "Safari".
    Tab in the "Safari" became constantly updated when I switch to another application or the other tabs! Apparent lack of memory (on iOS 7.1.2 with it all much better. At least when switching tabs does not re-update the previous tab).
    Playing online video on non-optimized mobile site in the browser "Safari" really does not work! It is turned on and loaded almost to infinity! Sometimes just a black screen with an icon "Play" to be pressed at least 100 times, and the result is 0!
    Scroll pages in the browser have become terribly sharp and smooth! on iOS 7.1.2 everything is fine, nice and smooth and no such bugs! Total confusion and thoughtfulness browser "Safari".
    If the video still runs (for me equates to a miracle) then when rewinding the film is generally something strange ... Fast chooses how minutes and seconds I watch a movie (usually just starts playing from the beginning), or does not respond at all ... This is the same magic Apple? Unlikely.
    3 multitasking menu (double-press "HOME").
    Call multitasking (by double-clicking "HOME") began working with a delay, with a lag, c jerky animation, and sometimes even without it.
    Control Center (which is called swipe upwards) was to slow down! Yes! That retard! Animation jumping shutter control center began play with tangible frame loss! If iPhone 5s under the control of OS iOS 7.1.2 everything happened smoothly, beautifully and dynamically in the iOS 8.0 it looks like on the iPhone 5 running iOS 7.C than strongly connected is not clear! Graphic differences from iOS iOS 7 8 almost equal to 0, and the speed of decline in almost 50%! How ?! Why ?! Why does my iPhone 5s become the iPhone 5 ?! This is an artificial slowing my device to increase the demand on the iPhone 6 or still glitch iOS 8.0 for iPhone 5s? Honey the company Apple, I really hope for the 2nd. Especially this shortfall fps animation curtain markedly if you open multitasking (acquired by double button "HOME") and call the control center and you'll see that the animation is playing choppy and not smooth! On IOS 7.1.2 this is not! Control center jumps smoothly and beautifully! On iOS 8.0 it happens all the time! Even if you turn off your favorite contacts and recent calls (I'm ashamed to say they thought) that appeared in iOS 8 (they are above programs on the multi-tasking) not solve the problem. As well, if you call the control center on the lock screen, then drop FPS will be very noticeable even to the untrained viewer (especially if you take two iPhone 5s one running iOS 7 and 8, the second on iOS and compare them on the forehead). If the Control Center click airdrop (air play) the animation of its appearance again played in spurts and not terribly nice and smoothly (especially noticeable on the lock screen and comparison of the forehead)! In a telephone call has been going absolutely shameless FPS drop a call center management and other activities!
    And yes, for me it is a critical issue! I do not want the transition to iOS 9 my iPhone 5s turned to the iPhone 4 on iOS 7 (vid you all remember this terrible story?)! I want my iPhone 5s worked as smoothly as on iOS 7.1.2! Nor any justification for this inhibition iskuvsstvennoy I can not see! 8 beautiful iOS did not! graphic elements do not appear! So goes the Apple is doing this on purpose ?! We go down the list!
    4 minor bugs that just break my brain and kill all the beauty of the use of "the best mobile operating system in the world"!
    4.1. When a call comes in when you clicked the icon making a call the phone for about 2-3 seconds, vibrates and plays a melody. On iOS 7.1.2 ringtone and vibration stops as soon as you have accepted the challenge and in your ear does not play your ringtone by "imagine Dragons", cheeks beats you invented vibration in the style of "Tick-tonic."
    4.2. When you look at the page on the Internet-phone terribly terribly strongly heated! A pair of piping hot! On iOS 7.1.2 is no such problem! Telephone hot, but not as much as on iOS 8.0!
    4.3. Folder on the home screen opens with a delay of 0.5-1 second is the impact on the overall impression of iOS 8.0.
    4.4. When you create a set (12 pieces) icons in one folder if dramatically open the folder and make swipe to the left then the following icons in this folder does not have time to boot up and are delayed by 1 second.
    4.5. When you create a folder with 1-9 icons do if the above action fails then the animation (the same bug exists in iOS 7.1.2). It is very not nice aesthetically.
    4.6. Scroll to your "Settings" felt terribly antsy. Although it is not only in the application "Settings" but also to the entire system and applications in general ...
    4.7. Scroll to the Home screen has become less responsive to user actions all movements inogoda occur with jerky animation and some delay to the user.
    4.8. Quite often, and without rational reason for going off the sensor device. That is, the screen does not respond to any user action! Helps pressing "HOME" or hard reset by holding the button "HOME" and "POWER".
    4.9. Most people on the iPhone 5s lost communication with a mobile operator. Just go on and lost and because of this I have missed calls from their loved ones and friends (would cost you to be glad that I have not missed calls on business issues).
    5.0. Many owners of iPhone 5s and iPhone 5 uhudzhenie complain about battery life. I honestly did not notice it, but we will not drop this off.
      Outcome.
    And now gets quite an interesting question, why? Why does my iPhone 5s began to slow? Why in the absence of graphical improvements are absolutely the same actions were reproduced with the loss of fps, slow down, lag, hover, fly? Why, if put next iPhone 5s on iOS 7.1.2 and exactly the same iPhone 5s on iOS 8.0 and pull the control panel to call multitasking bar, carry out all other actions I have described it on your device running iOS 7.1.2 it will work without any delays, lags, the deterioration in the responsiveness of the interface, reducing fps, and no departures from simple applications written directly by Apple? I see absolutely no any obstacles in the way to make the iPhone 5s to the operating system iOS 8.0 worked with the same smoothness, with the same responsiveness and speed as the iPhone 5s running iOS 7.1.2! I do not see what these restrictions are not!
    There are many different bugs that I do not even remember now (as I write this text on emotions (positive) as able to roll back your iPhone 5s back to iOS 7.1.2, and he seemed to come alive with new life) and so far I have esteemed company APPLE does not eliminate these improvements do not, I will not go back to iOS 8.0! if the dispensation of these bugs, flaws, intentional degradation of the (almost identical in performance in comparison with the iPhone 6) IPhone 5s will not happen and the company APPLE will continue to apply to consumers of their products as a beta tester I will be forced to organize a petition and file a class action lawsuit in court not only in their own country (which is for the Russian Federation) but also in the United States and in other countries where people are just like me trying to deceive, mislead and force companies to buy new devices APPLE without having expressed any any more substantial explanation except as <iPhone 6 was 25% more powerful on with alignment with the iPhone 5s>!
    P.s.
    I hope Apple will still listen to their users and I also hope that it (Apple) still change his mind and will try in the near future to give users not-so-old devices (iPhone 5s, iPad Air, iPad mini Retina) and enjoy on all the new features of iOS 8 no lag, locked up, overheating, inhibited animation. Thank you for being there!
    Ru.
    Всем доброго времени суток! Я как и вы форумчане являюсь фанатом компании APPLE. Проживаю я в Российской Федерации. Начал свое знакомство с этой компанией в далеком 2010 году с устройства Ipad 2 тогда еще на ios 5. В январе 2014 я сделал себе подарок и купил iPhone 5s на OC IOS 7. Купил я его официально по официальной Российской цене которую выставила Apple точнее за 1100$. В нашей стране это очень большие деньги. На эти деньги я бы мог жить 3 месяца. По сути я стал обладателем топового (на тот момент) устройства от любимой компании Apple. Мой iPhone 5s прекрасно работал на ios 7. Иногда встречались легкие фризы анимации, и не критичные баги, но кто без греха? Любимой компании я был готов это простить так как вижу, что она старается быть лучше и не стоит на месте. Посмотрев презентацию WWDC на которой представили iOS 8 нас с вами уверяли, что все стало лучше, быстрее, функциональнее. Я твердо решил, что обновлю свой iPhone 5s до iOS 8.0... APPLE выпускает новую OC iOS 8... И я обновился! За красивыми словами, что нам говорили на презентации, за великолепными функциональными возможностями новой iOS скрывалось "нечто". И это "нечто" превратило мой телефон в... "тыкву"! Да! В ту самую тупую тыкву! И сейчас я объясню почему я думаю, что это тыква, а не роза.
    Море багов... причем они ужасны и страшны так как не дают мне в полноценной мере насладится работой моего iPhone 5s!
    Начнем по порядку:
    1. Потоковая передача данных посредством технологии "Air play".
    "Air play" перестал нормально работать! Он стал часто отсоединяться от Apple tv и Apple airport express последнего поколения. Apple tv 2g не может принять сигнал от моего iPhone 5s! А когда все же это у него получается то воспроизведение видео длится не долго оно просто обрывается и не дает подключиться повторно! Помогает перезагрузка Apple TV и жесткий сброс посредством удержания кнопки "HOME" и кнопки "POWER". На "Apple TV" стоит последняя прошивка так же эти проблемы проявлялись и на предыдущей прошивке устройства.
    2. Встроенный в систему Браузер "Safari".
    Вкладки в "Safari" стали постоянно обновляться когда я переключаюсь на другое приложение или на другие вкладки! Явная нехватка оперативной памяти (на iOS 7.1.2 с этим все гораздо лучше. по крайней мере при переключение вкладок не происходило повторное обновление предыдущей вкладки).
    Воспроизведение онлайн видео на не оптимизированном для мобильных устройств сайте в браузере "Safari" толком не работает! Оно включается и загружается чуть ли не до бесконечности! Порой просто черный экран с иконкой "Play" на которою нажимай хоть 100 раз, а результата 0!
    Пролистывание страниц в браузере стали до ужаса резкими и не плавными! на iOS 7.1.2 все прекрасно, плавно и красиво и таких багов нет! Общая заторможенность и задумчивость браузера "Safari".
    Если видео все же запускается (что для меня приравнивается к чуду) то при перемотке фильма происходит вообще что-то непонятное... Перемотка сама выбирает с какой минуты и секунды мне смотреть фильм (чаще просто начинает воспроизводить все с самого начала) либо не реагирует вовсе... Эта та самая магия Apple? Непохоже.
    3. Меню многозадачности (двойное нажатие кнопки "HOME").
    Вызов многозадачности (посредством двойного нажатия кнопки "HOME") стал работать с задержкой, с лагом, c дерганой анимацией, а порой и вовсе без нее.
    Центр управления (который вызывается свайпом снизу вверх) стал тормозить! Да! Именно тормозить! Анимация выпрыгивания шторки центра управления стала воспроизводиться с ощутимой потерей кадров! Если на iPhone 5s под управление OS iOS 7.1.2 все происходило плавно, красиво и динамично то в iOS 8.0 все выглядит как на iPhone 5 под управлением iOS 7.с чем это связанно решительно не понятно! Графические отличия iOS 7 от iOS 8 практически равны 0, а скорость работы сниженна практически на 50%! Как?! Почему?! Почему мой iPhone 5s стал iPhone 5?! Это искусственное замедление моего устройства для повышения спроса на iPhone 6 или все же недоработка iOS 8.0 для iPhone 5s? Дорогая компания Apple, я очень надеюсь на 2-е.  Особенно эту нехватку fps в анимации шторки заметно если открыть многозадачность (посредством двойного нажития кнопки "HOME") и вызвать центр управления и вы увидите что анимация проигрывается рывками и не плавно! На IOS 7.1.2 такого нет! Центр управления выпрыгивает плавно и красиво! На iOS 8.0 это происходит постоянно! Даже если отключить избранные контакты и недавние вызовы (я грешным делом подумал на них) которые появились в iOS 8 (они находятся выше программ на панели многозадачности) проблему не решить. Так же, если вызвать центр управления на экране блокировки то падение FPS будет очень заметно даже для неподготовленного зрителя (особенно если взять два iPhone 5s один под управление iOS 7 и второй на iOS 8 и сравнить их в лоб). Если в центре управления нажать кнопку airdrop (air play) то анимация ее появления опять таки проиграется рывками и ужасно не красиво и не плавно (особенно заметно на экране блокировки и при сравнение в лоб)! При телефонном вызове происходит уже совсем уж бессовестное падение FPS при вызове центра управления и при других действиях!
    И да, для меня это критичная проблема!  Я не хочу чтобы при переходе на iOS 9 мой iPhone 5s превратился в iPhone 4 на iOS 7 (Вы видь все помните эту страшную историю?)! Я хочу чтобы мой iPhone 5s работал так же плавно как и на iOS 7.1.2! Ни каких оправданий для этой искувсственной заторможенности я не вижу! iOS 8 красивей не стала! графических элементов больше не появилось! Так выходит компания Apple делает это специально?! Идем дальше по списку!
    4. мелкие баги которые просто разрывают мой мозг и убивают всю красоту использования "Самой лучшей мобильной операционной системы в мире"!
    4.1. При входящем вызове когда вы нажали иконку принятия вызова телефон еще около 2-3 секунд вибрирует и проигрывает мелодию. На iOS 7.1.2 мелодия и вибрация останавливается как только вы приняли вызов и вам в ухо не играет ваш рингтон в исполнении "imagine Dragons", по щекам не бьет придуманная вами вибрации в стиле "Тик-тоник".
    4.2. Когда смотришь страницы в интернете телефон ужасно-ужасно сильно греется! Парой обжигающе сильно! На iOS 7.1.2 такой проблемы нет! Телефон горячий, но не так сильно как на iOS 8.0!
    4.3. Папки на домашнем экране открываются с задержкой в 0.5-1 секунду это сказывается на общем впечатлении от iOS 8.0.
    4.4. При создании множества (12 штук) иконок в одной папке если резко открыть папку и сделать свайп влево то следующие иконки в этой папке не успевают загрузиться и отображаются с задержкой в 1 секунду.
    4.5. При создании папки с 1-9 иконками если проделать описанное выше действие то произойдет сбой анимации (этот же баг есть и в iOS 7.1.2). Это крайне не приятно эстетически.
    4.6. Пролистывание в приложении "Настройки" стало ужасно дерганым. Хотя не только в приложении "Настройки" но и по всей системе и в приложениях в целом...
    4.7. Пролистывание на Домашнем экране стало менее отзывчивое на действия пользователя все движения иногода происходят с дерганой анимацией и какой-то задержкой на действия пользователя.
    4.8. Довольно часто и без объяснимой причины происходит отключения сенсора устройства. То есть экран не реагирует ни на какие действия пользователя! Помогает нажатие кнопки "HOME" либо жесткий сброс посредством удержания кнопки "HOME" и "POWER".
    4.9. Большинства людей на  iPhone 5s пропадает связь с сотовым оператором. Просто берет и теряется и из за этого я уже пропускал звонки от своих близких и друзей (стоило бы вам порадоваться, что я не пропустил звонки по рабочим вопросам).
    5.0. Многие обладатели iPhone 5s и iPhone 5 жалуются на ухуджение работы аккумулятора. Я честно говоря этого не заметил, но не будем сбрасывать этого со счетов.
    Итог.
    А теперь встает довольно интересный вопрос, почему? Почему мой iPhone 5s стал тормозить? Почему при отсутствии графических улучшений абсолютно одни и те же действия стали воспроизводится с потерей fps, тормозить, лагать, зависать, вылетать? Почему если положить рядом iPhone 5s на iOS 7.1.2 и точно такой же iPhone 5s на iOS 8.0 и вытянуть панель управление, вызвать панель многозадачности, провести все остальные действия описанные мною то на устройстве под управлением iOS 7.1.2 все будет работать без каких либо задержек, лагов, ухудшение в отзывчивости интерфейса, уменьшении fps и просто без вылетов из приложений написанных непосредственно компанией Apple? Я не вижу абсолютно ни каких преград в том чтобы сделать так чтобы iPhone 5s под управлением операционной системой iOS 8.0 работал с той же плавностью, с той же отзывчивостью и скоростью, что и iPhone 5s под управлением iOS 7.1.2! Не вижу от того, что этих ограничений нет!
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