{"id":132,"date":"2012-05-11T18:40:01","date_gmt":"2012-05-11T16:40:01","guid":{"rendered":"http:\/\/www.virtualementvotre.ch\/blog\/?p=132"},"modified":"2014-07-13T15:46:34","modified_gmt":"2014-07-13T13:46:34","slug":"gestion-de-la-memoire-dans-un-serveur-esxi","status":"publish","type":"post","link":"https:\/\/www.virtualementvotre.ch\/blog\/2012\/05\/11\/gestion-de-la-memoire-dans-un-serveur-esxi\/","title":{"rendered":"Gestion de la m\u00e9moire dans un serveur ESXi"},"content":{"rendered":"<p>Bonjour,<\/p>\n<p>&nbsp;<\/p>\n<p>VMware a sorti un pdf tr\u00e8s complet sur la<strong> gestion de la m\u00e9moire<\/strong> dans un serveur ESXi 5<\/p>\n<p>Tout au long du d\u00e9veloppement des versions de l&#8217;hyperviseur, <strong>VMware<\/strong> a int\u00e9gr\u00e9 diff\u00e9rents types de fonctionnalit\u00e9s, afin optimiser l&#8217;utilisation de la m\u00e9moire et surtout de g\u00e9rer l\u2019espace <strong>m\u00e9moire physique<\/strong> en cas de <strong>contention<\/strong> suite, par exemple, \u00e0 une perte de plusieurs serveurs <strong>ESXi<\/strong>.<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/techno_memory1.png\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-529\" src=\"https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/techno_memory1-1024x140.png?resize=530%2C72\" alt=\"techno_memory1\" width=\"530\" height=\"72\" srcset=\"https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/techno_memory1.png?resize=1024%2C140&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/techno_memory1.png?resize=300%2C41&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/techno_memory1.png?w=1550&amp;ssl=1 1550w\" sizes=\"auto, (max-width: 530px) 100vw, 530px\" \/><\/a><\/p>\n<p>Premi\u00e8re technologie le <strong>TPS (Transparent Page Sharing)<\/strong> qui va \u00eatre capable d&#8217;analyser les paginations m\u00e9moires des VMs et consolider les paginations identiques en une. Elle se base sur des pages de 2MB ou de 4KB lors qu\u2019il y a une trop grande fragmentation.<\/p>\n<p>&nbsp;<\/p>\n<p>Seconde technologie, le <strong>Ballooning<\/strong>, qui va forcer l\u2019OS de la VM \u00e0 swapper dans son <strong>vmdk<\/strong>, gr\u00e2ce \u00e0 un driver, int\u00e9gr\u00e9 dans les <strong>VMware Tools<\/strong>, qui va r\u00e9clamer plus de m\u00e9moire. L\u2019OS n\u2019ayant pas d\u2019autre solution que de swapper dans son disque virtuel.<\/p>\n<p>Troisi\u00e8me et nouvelle fonctionnalit\u00e9 la <strong>compression<\/strong>, qui va permettre de compresser \u00e0 la hauteur de<strong> 10 % de la m\u00e9moire physique<\/strong>.<\/p>\n<p>Quatri\u00e8me et derni\u00e8re fonctionnalit\u00e9 le <strong>swap du VMKernel<\/strong>. Lors du d\u00e9marrage d\u2019une VM, un fichier swap est cr\u00e9\u00e9, par d\u00e9faut dans le dossier du <strong>.vmx<\/strong>, de la <strong>taille de la m\u00e9moire allou\u00e9e moins la r\u00e9servation<\/strong>. Ce fichier sera utiliser lorsque le VMKernel a <strong>balloon\u00e9<\/strong> toutes les VMs et s\u2019il a besoin encore plus de m\u00e9moire physique \u00e0 disposition.<\/p>\n<p>On peut \u00e9galement activer, dans ce cas-l\u00e0, le<strong> swap cache sur SSD<\/strong> afin de profiter des faibles latences de ce type de stockage.<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/memory_mngt.jpg\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-526\" src=\"https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/memory_mngt.jpg?resize=530%2C350\" alt=\"memory_mngt\" width=\"530\" height=\"350\" srcset=\"https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/memory_mngt.jpg?w=540&amp;ssl=1 540w, https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/memory_mngt.jpg?resize=300%2C198&amp;ssl=1 300w\" sizes=\"auto, (max-width: 530px) 100vw, 530px\" \/><\/a><\/p>\n<p>En r\u00e9sum\u00e9, si vous arriv\u00e9 \u00e0 ce point, soit votre architecture est tr\u00e8s mal conceptualis\u00e9e, soit vous avez mis des limitations sur les ressources m\u00e9moires de vos VMs\u2026<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/vSphere5Memory1.png\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-530\" src=\"https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/vSphere5Memory1-1024x640.png?resize=530%2C331\" alt=\"vSphere5Memory1\" width=\"530\" height=\"331\" srcset=\"https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/vSphere5Memory1.png?resize=1024%2C640&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/vSphere5Memory1.png?resize=300%2C187&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/vSphere5Memory1.png?w=1680&amp;ssl=1 1680w, https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/vSphere5Memory1.png?w=1590&amp;ssl=1 1590w\" sizes=\"auto, (max-width: 530px) 100vw, 530px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/kb.vmware.com\/selfservice\/microsites\/search.do?language=en_US&amp;cmd=displayKC&amp;externalId=2017642\">http:\/\/kb.vmware.com\/selfservice\/microsites\/search.do?language=en_US&amp;cmd=displayKC&amp;externalId=2017642<\/a><\/p>\n<p>Il y a \u00e9galement des explications li\u00e9es aux graphiques dans le <strong>vCenter<\/strong>.<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/diagmemory.png\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-531\" src=\"https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/diagmemory.png?resize=530%2C361\" alt=\"diagmemory\" width=\"530\" height=\"361\" srcset=\"https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/diagmemory.png?w=785&amp;ssl=1 785w, https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/diagmemory.png?resize=300%2C204&amp;ssl=1 300w\" sizes=\"auto, (max-width: 530px) 100vw, 530px\" \/><\/a><\/p>\n<p>Et \u00e0 l\u2019interpr\u00e9tation de la commande <strong>ESXTOP<\/strong>.<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/ESXTOP_memory.png\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-532\" src=\"https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/ESXTOP_memory-1024x451.png?resize=530%2C233\" alt=\"ESXTOP_memory\" width=\"530\" height=\"233\" srcset=\"https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/ESXTOP_memory.png?resize=1024%2C451&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/ESXTOP_memory.png?resize=300%2C132&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.virtualementvotre.ch\/blog\/wp-content\/uploads\/2012\/05\/ESXTOP_memory.png?w=1185&amp;ssl=1 1185w\" sizes=\"auto, (max-width: 530px) 100vw, 530px\" \/><\/a><\/p>\n<p>Ce graphique est tr\u00e8s complet et permet une bonne compr\u00e9hension de ces diff\u00e9rentes technologies et \u00e0 quel moment elles rentrent en action.<\/p>\n<p>J\u2019avoue qui va me servir lors de mes prochains <strong>cours VMware ICM<\/strong>.<\/p>\n<p>&nbsp;<\/p>\n<p>Bonne lecture<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Bonjour, &nbsp; VMware a sorti un pdf tr\u00e8s complet sur la gestion de la m\u00e9moire dans un serveur ESXi 5 Tout au long du d\u00e9veloppement des versions de l&#8217;hyperviseur, VMware a int\u00e9gr\u00e9 diff\u00e9rents types de fonctionnalit\u00e9s, afin optimiser l&#8217;utilisation de la m\u00e9moire et surtout de g\u00e9rer l\u2019espace m\u00e9moire physique en cas de contention suite, par exemple, \u00e0 une perte de <a class=\"more-link\" href=\"https:\/\/www.virtualementvotre.ch\/blog\/2012\/05\/11\/gestion-de-la-memoire-dans-un-serveur-esxi\/\">Continue reading <span class=\"screen-reader-text\">  Gestion de la m\u00e9moire dans un serveur ESXi<\/span><span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":526,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[9,3],"tags":[184,187,50,188,189,181,180,183,182,186,150,185],"class_list":["post-132","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-virtualisation","category-vmware","tag-ballooning","tag-compression","tag-esxi","tag-esxtop","tag-gestion-memoire","tag-memoire","tag-memory","tag-swap","tag-tps","tag-transparent-page-sharing","tag-vmdk","tag-vmkernel"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- 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