BLOBCache, Web Garden and DisallowOverlappingRotation. Are they best friends ?


In my opinion BLOBCache is a must have in most MOSS environments. It is known that BLOBCache and Web Garden are not the best of friends, and according to Optimizing Office SharePoint Server for WAN environments don´t use Web Garden if you have BLOBCache in your environment. The main reason for this is that only one process can acquire the lock to this cache and if the process serving the request is not the one who acquired the lock then you can imagine you won´t get the result you were expecting.


 


So far so good, but there is another setting that can also get you into trouble even if you don´t have a Web Garden scenario.


 


IIS 6.0 has a metabase property called DisallowOverlappingRotation and according to documentation (DisallowOverlappingRotation Metabase Property)


 


“The DisallowOverlappingRotation property specifies whether or not the World Wide Web Publishing Service (WWW Service) should start up another worker process to replace the existing worker process while it is shutting down."


 


The default value for this property is FALSE (see table below) which means that WWW Service is allowed to start a new worker process when the old one is shutting down.


 









































Attribute Name


Attribute Value


XML Data Type


Boolean


WMI Data Type


Boolean


ADSI Data Type


Boolean


ABO Data Type


Boolean


ABO Metabase Identifier


MD_APPPOOL_DISALLOW_OVERLAPPING_ROTATION


Attributes


INHERIT


Default Value


false


MetaFlagsEx


CACHE_PROPERTY_MODIFIED


User Type


IIS_MD_UT_SERVER


ID


9015


 


Now you can imagine there is a frame in time where you have multi-instance because both processes still exist (this is like Web Garden but just for a short period of time). When this new process starts it will try to acquire the lock to the cache but what happens if the process that is shutting down hasn´t yet released this lock? The new process won´t be able to acquire and it won´t be able to use this cache to improve the performance of your website. You will notice a decrease in performance until you do an IISReset.


 


Also in documentation about this property we can read the following


“The value of this property should be set to true if the worker process loads any application code that does not support multi-instance.


 


My advice is that if your environment makes use of BLOBCache also set IIS 6.0 property DisallowOverlappingRotation to TRUE.


 


Bruno

Comments (9)

  1. Anonymous says:

    よーやくプロフ持ちになれました。私の事気になった方がいましたら気軽にメールください。恋バナとか好きなんでよろしくでぇす。zuttozuttoissyodayo@docomo.ne.jp

  2. Anonymous says:

    女性会員様増加につき、当サイトの出張ホストが不足中です。女性の自宅やホテルに出向き、欲望を満たすお手伝いをしてくれる男性アルバイトをただいま募集していますので、興味のある方はTOPページから無料登録をお願いいたします

  3. Anonymous says:

    最近様々なメディアで紹介されている家出掲示板では、全国各地のネットカフェ等を泊り歩いている家出少女のメッセージが多数書き込みされています。彼女たちはお金がないので掲示板で知り合った男性とすぐに遊びに行くようです。あなたも書き込みに返事を返してみませんか

  4. Anonymous says:

    あなたのモテ度数を診断できる、モテる度チェッカー!日頃モテモテでリア充のあなたもそうでないヒキニートの貴方も隠されたモテスキルを測定して今以上にモッテモテになること間違いなし

  5. Anonymous says:

    オ○ニーライフのお手伝い、救援部でHな見せたがり女性からエロ写メ、ムービーをゲットしよう!近所の女の子なら実際に合ってHな事ができちゃうかも!?夏で開放的になっている女の子と遊んじゃおう

  6. Anonymous says:

    メル友募集のあそび場「ラブフリー」はみんなの出逢いを応援する全国版の逆援助コミュニティーです!女の子と真剣にお付き合いしたい方も、複数の女性と戯れたい方も今すぐ無料登録からどうぞ

  7. Anonymous says:

    簡単にお小遣い稼ぎをしたい方必見、当サイト逆¥倶楽部では無料登録して女性の性の欲求に応えるだけのアルバイトです。初心者でもすぐに高収入の逆¥交際に興味をもたれた方はTOPページまでどうぞ。

  8. Anonymous says:

    プロフ作りました。興味ある方連絡まってま〜す。メアドを乗せておくので連絡ください。色んな人の色んな話聞きたい感じですのでヨロシクhappy-my-life-.-@docomo.ne.jp

Skip to main content