Cached IO´Â ¾ø¾îÁø´ä´Ï´Ù

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참조글.

http://sqlblog.com/blogs/joe_chang/archive/2010/10/11/caching-raid-controller-performance-tuning-secrets-cough-giggle.aspx


LSI는 Cached IO를 장기적으로 없앨거라고 합니다. disk io가 너무 좋아졌죠.

 The Cached IO " (All read and write data passes through controller cache memory on its ways to or from host memory, includes write data in Write-Through mode), legacy option is being eliminated in a future release.


델 PERC 710에는 Cut-through IO라는 것이 들어 있습니다.

이것은 SSD에 적합한 것으로 성능을 2배로 높여준다고 합니다.

Cut-Through IO is an IO accelerator that boosts the throughput of devices connected to the PERC Controller. It is enabled through disabling the write-back cache (enable write-through cache) and disabling Read Ahead.

- to be continue -
¾Æ´äÅØ Ä«µå¿¡¼­ SSD·Î Raid 0 ¹­À»·Á´Ï±î °æ°í¶ß¸é¼­ ij½¬»ç¿ë ¾ÈÇÏ´Â°É ÃßõÇÑ´Ù°í
ÇÏ´øµ¥ ±×°Å¶û °°Àº ¸Æ¶ôÀÌ·Á³ª¿ä?
     
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¿¹. ssd¿Í °°Àº °í¼ÓÀÇ io µð¹ÙÀ̽º´Â cache¸¦ ¾²¸é ¼Óµµ°¡ ´õ ¶³¾îÁý´Ï´Ù.
¹«Á¶°Ç direct io¸¦ ½á¾ß ÇÕ´Ï´Ù.
          
¿À... ±×·¸´Ù¸é SSD·Î Raid ±¸¼ºÇÏ·Á°í Raid Ä«µå¸¦ »ê´Ù°í Çϸé, Raid ÇÁ·Î¼¼¼­ÀÇ
¼º´ÉÀÌ ÁÁÀº°É »ç´Â°Ô Á¤´äÀÌ°Ú³»¿ä. ÃֽŠRaid Ä«µåµé º¸¸é SSDÀÇ ´ë¿ªÆøÀ»
Ä¿¹öÇÑ´Ù°íµé Çϴµ¥ ó¸® ÇÁ·Î¼¼¼­µéÀº Á¦´ë·ÎµÈ ¼º´ÉÀÌ ³ª¿ÍÁÖ´ÂÁö ±Ã±ÝÇØÁö´Â±º¿ä.
SSD·¹ÀÌµå ¼º´ÉÃøÁ¤ ÇØ ³õÀº°Ô ÀÖ´ÂÁö ã¾ÆºÁ¾ß°Ú½À´Ï´Ù.
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Cached IO´Â 100% ÀбâÀü¿ëÀ϶§ »ç¿ëÇϼ¼¿ä.
±æµ¿ÀÌ 2014-05
Ç×»ó±Ã±ÝÇß¾ú´Âµ¥,
Cut-Through IO ¿¡¼­ µð½ºÅ©»óÀÇ Ä³½¬¸¦ ²¨¾ßÇÏ´ÂÁö ÄѾßÇÏ´ÂÁö °í¹ÎµË´Ï´Ù. ½ÇÁ¦ ¼º´ÉÂ÷À̵µ ±Ã±ÝÇÏ°í.

·¹À̵å ÄÁÆ®·Ñ·¯ ij½¬¸¦ ²¨¹ö¸®°í, SSD »óÀÇ Ä³½¬¸¦ ÄѳõÀ¸¸é ºñÁ¤»ó Á¾·á ¹ß»ý½Ã µ¥ÀÌŸ ¹«°á¼º¿¡ ¹®Á¦°¡ ¹ß»ýÇÒ ¼ö ÀÖ½À´Ï´Ù.
¹°·Ð SSDÄÁÆ®·Ñ·¯¸¸µç ¾÷ü°¡ FUAµüÁö°¡ ºÙÀº IO¿¡ ´ëÇØ, Á¦´ë·Î ±¸ÇöÇß´Ù¸é, DB¼­¹ö°°Àº °æ¿ì´Â ´ú ÇÏ°ÚÁö¸¸..
ÀϹÝÀûÀ¸·Î ¼­¹ö¿ë ·¹À̵å ÄÁÆ®·Ñ·¯´Â, HDD³»ºÎÀÇ Ä³½¬¸¦ Á׿©¹ö¸®°í, ¹èÅ͸® ¹é¾÷µÇ´Â ·¹À̵å ÄÁÆ®·Ñ·¯ »óÀÇ Ä³½¬¸¸À» »ç¿ëÇÕ´Ï´Ù.
     
ȸ¿øK 2014-05
¼­¹öÀÇ °æ¿ì disk cache´Â ±âº»À¸·Î disable ÀÔ´Ï´Ù.
µð½ºÅ©¿¡ cache°¡ ÀÖÀ¸¸é, ³¯¾Æ°¥ ¼ö ÀÖ°í È¿°úµµ º°·Î ÀÔ´Ï´Ù.


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