{"id":2133,"date":"2026-09-21T11:29:59","date_gmt":"2026-09-21T08:29:59","guid":{"rendered":"https:\/\/www.bigsbilisim.com\/?p=2133"},"modified":"2026-09-21T14:44:48","modified_gmt":"2026-09-21T11:44:48","slug":"disk-alarm-drowned-in-noise-tickets","status":"publish","type":"post","link":"https:\/\/www.bigsbilisim.com\/tr\/disk-alarm-drowned-in-noise-tickets\/","title":{"rendered":"Y\u00fczlerce G\u00fcr\u00fclt\u00fc Cezas\u0131 Aras\u0131nda Bo\u011fulan Disk Alarm\u0131"},"content":{"rendered":"
\r\n
https:\/\/www.youtube.com\/watch?v=fz-KSMZP1Dw<\/div>\r\n<\/figure>\r\n\r\n

Yaz ba\u015flar\u0131nda bir Pazartesi g\u00fcn\u00fc. \u0130kimiz de bir t\u00fcrl\u00fc bo\u015falmayan bir destek talebi kuyru\u011fuyla bo\u011fu\u015furken, meslekta\u015f\u0131m \u00fcretim veritaban\u0131 sunucusunda disk alan\u0131 ile ilgili bir destek talebini bellek alarm\u0131 olarak alg\u0131lay\u0131p kapat\u0131yor. Bu i\u015flem yakla\u015f\u0131k iki saniye s\u00fcr\u00fcyor, ki bu da her destek talebi i\u00e7in ayr\u0131lan s\u00fcreye kabaca denk geliyor.<\/p>\r\n

Dikkatsiz de\u011fildi. Sistem taraf\u0131ndan aylarca ikimize de \u00f6\u011fretilen \u015feyi aynen yap\u0131yordu. \u0130\u015fte alarm yorgunlu\u011funun i\u00e7eriden g\u00f6r\u00fcn\u00fcm\u00fc bu.<\/p>\r\n

O zamanlar, T\u00fcrkiye'deki bir otomobil \u00fcreticisinin fabrikas\u0131 ad\u0131na k\u00fcresel bir BT hizmetleri sa\u011flay\u0131c\u0131s\u0131 i\u00e7in \u00e7al\u0131\u015f\u0131yordum. Yakla\u015f\u0131k 300 Windows sunucusu vard\u0131. Herkesin k\u00fcresel standart dedi\u011fi bir sistemle, ba\u015fka bir ekip taraf\u0131ndan y\u00f6netilen bir izleme platformu da mevcuttu.<\/p>\r\n

Kendi hava durumunu yaratan standart<\/h2>\r\n

Kural, bir slayta s\u0131\u011facak kadar basitti: Otomatik ba\u015flatmaya ayarlanm\u0131\u015f her Windows hizmetini izleyin ve bunlardan biri \u00e7al\u0131\u015fmad\u0131\u011f\u0131nda alarm verin.<\/p>\r\n

Google Chrome bir g\u00fcncelleme servisi kurar. Bu servis otomatik ba\u015flatmaya ayarlan\u0131r ve Chrome istedi\u011fi zaman bu servisi ba\u015flat\u0131p durdurur. 300 sunucunun 100'den fazlas\u0131nda Chrome y\u00fckl\u00fcyd\u00fc. Bu sistemdeki taray\u0131c\u0131 g\u00fcncellemeleri zaten SCCM'den geliyordu, bu nedenle g\u00fcncelleme program\u0131n\u0131n nefes al\u0131p vermekten ba\u015fka yapacak faydal\u0131 bir i\u015fi yoktu.<\/p>\r\n

\u0130zleme sistemimiz, bu nefes al\u0131\u015fveri\u015flerinin her birini cezai i\u015flem gerektiren bir olay olarak de\u011ferlendirdi.<\/p>\r\n

G\u00fcnde y\u00fczlerce "hizmet durduruldu" talebi. \u0130kimiz bunlar\u0131 kapat\u0131yoruz, toplant\u0131lar s\u0131ras\u0131nda bile, bir g\u00f6z\u00fcm\u00fcz telefonda, di\u011fer elimiz kuyrukta. Bir ritim \u00f6\u011freniyorsunuz. Talebin i\u00e7eri\u011fini okumay\u0131 b\u0131rak\u0131p \u015feklini okumaya ba\u015fl\u0131yorsunuz: konu sat\u0131r\u0131, sunucu ad\u0131, kapatma.<\/p>\r\n

\u0130kinci g\u00fcr\u00fclt\u00fc kayna\u011f\u0131<\/h2>\r\n

Ayn\u0131 d\u00f6nem, ayn\u0131 hesap. M\u00fc\u015fteri, SQL Server'da maksimum bellek s\u0131n\u0131r\u0131 belirlememize izin vermedi. Durum a\u00e7\u0131k\u00e7a \u015f\u00f6yle ifade edildi: "Paras\u0131n\u0131 \u00f6dedim, hepsini kullanaca\u011f\u0131m."\u201c<\/p>\r\n

Bu nedenle, her gece raporlar olu\u015fturulurken, veritaban\u0131 sunucular\u0131 yakla\u015f\u0131k on dakika boyunca 100% RAM ve CPU kullan\u0131m\u0131yla \u00e7al\u0131\u015f\u0131yordu. Alarm gece yar\u0131s\u0131 \u00e7ald\u0131. Vardiya ekibimiz yoktu. Sabahleyin birileri bakt\u0131\u011f\u0131nda, her \u015fey \u00e7oktan normale d\u00f6nm\u00fc\u015ft\u00fc ve SLA saati, ge\u00e7 yan\u0131t verdi\u011fimiz i\u00e7in bize \u00e7oktan ceza kesmi\u015fti.<\/p>\r\n

Biz daha m\u00fctevaz\u0131 bir \u015fey istedik. Sadece CPU veya RAM kullan\u0131m\u0131 en az bir saat boyunca 100% seviyesinde kal\u0131rsa kaynak alarm\u0131 verilmesini ve mesai saatleri d\u0131\u015f\u0131ndaki durumun farkl\u0131 \u015fekilde ele al\u0131nmas\u0131n\u0131 rica ettik. \u0130zleme ekibinden gelen cevap ise \u015fuydu: "\u00d6zel bir ayar yapamam. Bunu herkes i\u00e7in yaparsam, her b\u00f6lge kendi standard\u0131n\u0131 belirler ve ben bunu y\u00f6netemem."\u201c<\/p>\r\n

Bu cevab\u0131 itiraf etmek istedi\u011fimden daha iyi anl\u0131yorum. Her yerde uygulayabilece\u011finiz bir standard\u0131 y\u00f6netmek kolayd\u0131r. Kimsenin ayarlayamad\u0131\u011f\u0131 bir standart ise standart de\u011fildir, bir hava sistemidir ve onunla tart\u0131\u015fmak yerine ona g\u00f6re giyinirsiniz.<\/p>\r\n

Giydi\u011fimiz k\u0131yafet, toplu kapatmayd\u0131. Ayn\u0131 sunucuda ayn\u0131 sorun i\u00e7in \u00fc\u00e7 veya d\u00f6rt bilet normaldi. Bilet kapatmak bir eylem olmaktan \u00e7\u0131k\u0131p bir refleks haline gelmi\u015fti.<\/p>\r\n

Var olan sinyal<\/h2>\r\n

Beni h\u00e2l\u00e2 rahats\u0131z eden k\u0131s\u0131m bu. Disk alarm\u0131 kay\u0131p de\u011fildi. Disk alan\u0131 izleme sistemi kurulmu\u015ftu, e\u015fik de\u011fer tetiklenmi\u015fti, platform g\u00f6revini yerine getirmi\u015fti.<\/p>\r\n

G\u00f6revini tam olarak bir kez yerine getirdi. Alarm bir bilet haline d\u00f6n\u00fc\u015ft\u00fcr\u00fcld\u00fc ve o andan itibaren platform konuyu halledilmi\u015f olarak kabul etti. Diskin boyutu hi\u00e7 artmad\u0131\u011f\u0131 i\u00e7in alarm\u0131n kendisi asla silinmedi. Ancak bir insan bileti kapatt\u0131 ve her iki taraf da di\u011fer taraf\u0131n ayn\u0131 fikirde olup olmad\u0131\u011f\u0131n\u0131 asla kontrol etmedi.<\/p>\r\n

24 saat sonra hi\u00e7bir hat\u0131rlatma yok. Bir hafta boyunca a\u00e7\u0131k kalan bir alarm i\u00e7in hi\u00e7bir i\u015flem yap\u0131lm\u0131yor. Alarm temizlendi\u011finde bileti kapatan ve alarm hala aktifken kapatmay\u0131 reddeden bir kural yok. A\u00e7\u0131k bir alarm \u00fc\u00e7 ay boyunca konsolda sessizce bekledi, zaten konu\u015ftu\u011funa emin bir \u015fekilde.<\/p>\r\n

\u00dc\u00e7 ay sonra<\/h2>\r\n

\u00dcretim veritaban\u0131 sunucusundaki disk doldu. SQL hizmetleri durdu. Bununla birlikte fabrikadaki \u00fcretim de durdu. Zarar\u0131n binlerce dolar\u0131 buldu\u011fu bildirildi; bize b\u00f6yle s\u00f6ylendi ve yan\u0131na koyabilece\u011fim bir faturam yok.<\/p>\r\n

Hemen diski uzatt\u0131k, bu faydal\u0131 gibi g\u00f6r\u00fcnse de asl\u0131nda de\u011fildi. Hat zaten kesilmi\u015fti.<\/p>\r\n

Kimse meslekta\u015f\u0131m\u0131 su\u00e7lamad\u0131 ve \u015funu a\u00e7\u0131k\u00e7a belirtmek istiyorum ki bu, y\u00f6neticilerin c\u00f6mertli\u011fi de\u011fildi. Y\u00f6neticiler g\u00fcr\u00fclt\u00fcden haberdard\u0131. Her ay ayn\u0131 hizmet de\u011ferlendirmelerini okuyorlard\u0131; bu de\u011ferlendirmelerde "neden ge\u00e7 yan\u0131t verdiniz?" sorusu her ay soruluyor ve ayn\u0131 kopyala-yap\u0131\u015ft\u0131r cevab\u0131 veriliyordu: "Talep mesai saatleri d\u0131\u015f\u0131nda geldi, vardiya ekibimiz yok."\u201c<\/p>\r\n

Mutsuz bir m\u00fc\u015fteri, mutsuz bir personel ve kaybedilen para. K\u00fcresel standart i\u015fte bunu getirdi.<\/p>\r\n

Neden kimse g\u00f6rmedi: i\u015f yerinde alarm yorgunlu\u011fu<\/h2>\r\n

Teknik sebep \u015fu ki, platform ilgili yaz\u0131l\u0131m i\u00e7in normal davran\u0131\u015f olan durum de\u011fi\u015fiklikleri konusunda uyar\u0131 verdi, kaynak alarmlar\u0131na s\u00fcre e\u015fi\u011fi uygulamad\u0131, biletleri "ate\u015fle ve unut" tarz\u0131nda olu\u015fturdu ve bilet durumu ile alarm durumu aras\u0131nda hi\u00e7bir zaman uyum sa\u011flamad\u0131.<\/p>\r\n

\u0130nsan mant\u0131\u011f\u0131 daha k\u0131sad\u0131r. \u0130ki ki\u015fi g\u00fcnde y\u00fczlerce fi\u015fi okuyamaz, bu y\u00fczden okumay\u0131 b\u0131rak\u0131rlar. Okumay\u0131 b\u0131rakt\u0131\u011f\u0131n\u0131zda, her fi\u015f bir \u00f6ncekine benzer ve diskteki fi\u015f haf\u0131zadaki fi\u015fe benzer. G\u00fcr\u00fclt\u00fc, sinyali izleme sisteminden gizlemedi. Sinyali bizden gizledi.<\/p>\r\n

\u0130zlenmesi gerekmeyen \u015feyleri izlemek ek bir g\u00fcvenlik sa\u011flamaz. Aksine, izlemenin kendisini \u00f6ld\u00fcr\u00fcr.<\/p>\r\n

Onu ne yakalam\u0131\u015f olabilirdi?<\/h2>\r\n
    \r\n
  • Bir g\u00fcr\u00fclt\u00fc b\u00fct\u00e7esi. Her alarm s\u0131n\u0131f\u0131 i\u00e7in haftal\u0131k bilet say\u0131s\u0131 tavan\u0131 belirleyin. Bu tavan\u0131 a\u015fan her s\u0131n\u0131f ya devre d\u0131\u015f\u0131 b\u0131rak\u0131l\u0131r ya da e\u015fi\u011fi yeniden yaz\u0131l\u0131r ve bu karar\u0131n bir sorumlusu ve tarihi vard\u0131r.<\/li>\r\n
  • Kaynak alarm s\u00fcreleri i\u00e7in e\u015fik de\u011ferler. Gece \u00e7al\u0131\u015ft\u0131r\u0131lan bir toplu i\u015flem s\u0131ras\u0131nda on dakika boyunca CPU veya RAM'in 100% seviyesinde kullan\u0131lmas\u0131 bir rapor \u00e7al\u0131\u015fmas\u0131 anlam\u0131na gelir. Bir saat boyunca kullan\u0131lmas\u0131 ise bir olay olarak de\u011ferlendirilir. Bu fark\u0131 kodlay\u0131n, SLA cezalar\u0131 \u00f6demekten ka\u00e7\u0131n\u0131n.<\/li>\r\n
  • Mesai saatleri d\u0131\u015f\u0131nda yap\u0131lacak i\u015flerle ilgili a\u00e7\u0131k bir politika belirlenmeli. E\u011fer vardiya ekibi yoksa, bu durum s\u00f6zle\u015fmede ve uyar\u0131 y\u00f6nlendirmesinde belirtilmeli ve gece alarm\u0131na m\u00fcdahale edecek birinin oldu\u011fu yan\u0131lsamas\u0131 b\u0131rak\u0131lmal\u0131.<\/li>\r\n
  • A\u00e7\u0131k kalan alarmlar i\u00e7in yeniden bildirim ve \u00fcst kademeye bildirim. \u0130lk bildirimden 24 saat sonra durum hala ge\u00e7erliyse, sistem daha y\u00fcksek sesle ba\u015fka birine tekrar uyar\u0131da bulunur. "Zaten bir bildirim olu\u015fturdum" durumu, kimsenin rahat edebilece\u011fi bir durum olmamal\u0131d\u0131r.<\/li>\r\n
  • Alarm durumuna ba\u011fl\u0131 otomatik kapanma. Bilet, yorgun bir insan\u0131n t\u0131klamas\u0131yla de\u011fil, alarm ortadan kalkt\u0131\u011f\u0131nda kapan\u0131r. Alarm hala aktifse, bilet yeniden a\u00e7\u0131l\u0131r.<\/li>\r\n
  • Standart i\u00e7in belgelenmi\u015f bir istisna yolu. Sohbet penceresinde istenen bir iyilik de\u011fil, kendi formu, onaylay\u0131c\u0131s\u0131 ve SLA's\u0131 olan bir talep; b\u00f6ylece "\u0130stisnalar\u0131 y\u00f6netemem" bir ret de\u011fil, bir s\u00fcre\u00e7 haline geliyor.<\/li>\r\n<\/ul>\r\n

    Sonuncusu siyasi bir madde ve di\u011fer be\u015finin ger\u00e7ekle\u015fip ger\u00e7ekle\u015fmeyece\u011fine karar veren de asl\u0131nda o.<\/p>\r\n

    Pazartesi g\u00fcn\u00fc, ge\u00e7en haftan\u0131n alarm seslerini alarm s\u0131n\u0131f\u0131na g\u00f6re say\u0131n, en g\u00fcr\u00fclt\u00fcl\u00fc s\u0131n\u0131f\u0131 bulun ve ba\u015fka bir \u015feye ayar yapmadan \u00f6nce onu devre d\u0131\u015f\u0131 b\u0131rak\u0131n.<\/p>\r\n

    Kaynaklar<\/h2>\r\n
      \r\n
    • Yazar\u0131n birinci elden anlat\u0131m\u0131. Herhangi bir d\u0131\u015f kaynak kullan\u0131lmam\u0131\u015ft\u0131r; \u015firket, m\u00fc\u015fteri, sunucu adlar\u0131 ve kesin tarihler bilerek belirtilmemi\u015ftir.<\/li>\r\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Her otomatik ba\u015flat\u0131lan Windows hizmetini izleyen bir izleme standard\u0131, ger\u00e7ek bir disk ar\u0131zas\u0131n\u0131 g\u00fcnl\u00fck y\u00fczlerce hata kayd\u0131n\u0131n alt\u0131na g\u00f6md\u00fc. \u00dc\u00e7 ay sonra bir fabrika \u00fcretimini durdurdu.<\/p>","protected":false},"author":1,"featured_media":2132,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[180],"tags":[189,191,192,187,188,190],"class_list":["post-2133","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-alert-fatigue","tag-disk-space-alarm","tag-monitoring-standard","tag-out-of-hours-alerting","tag-sla-penalty","tag-ticket-noise"],"yoast_head":"\nAlert Fatigue: How a Real Disk Alarm Drowned in Noise Tickets<\/title>\n<meta name=\"description\" content=\"Alert fatigue in practice: a 'global standard' that alerted on every autostart service buried a real disk alarm. 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