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ÇѱÛÁ¦¸ñ(Korean Title) |
Ç÷¡½Ã¸Þ¸ð¸® SSD¸¦ ÀÌ¿ëÇÑ È®ÀåÇü ¹öÆÛ °ü¸® |
¿µ¹®Á¦¸ñ(English Title) |
Extended Buffer Management with Flash Memory SSDs |
ÀúÀÚ(Author) |
½ÉµµÀ±
¹ÚÀå¿ì
±è¼ºÅº
ÀÌ»ó¿ø
¹®ºÀ±â
Doyoon Sim
Jangwoo Park
Sungtan Kim
Sangwon Lee
Bongki Moon
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¿ø¹®¼ö·Ïó(Citation) |
VOL 37 NO. 06 PP. 0308 ~ 0314 (2010. 12) |
Çѱ۳»¿ë (Korean Abstract) |
ÃÖ±Ù µé¾î, Ç÷¡½Ã¸Þ¸ð¸®ÀÇ °¡°ÝÀÌ Áö¼ÓÀûÀ¸·Î ³·ÃçÁö°í, Ç÷¡½Ã¸Þ¸ð¸® ±â¹Ý SSD ÄÁÆ®·Ñ·¯ ±â¼úÀÌ ±Þ°ÝÇÏ°Ô ¹ßÀüÇÏ¸é¼ ÁßÀú°¡ÀÇ °í¼º´É Ç÷¡½Ã SSD°¡ ½ÃÀå¿¡ ³Î¸® º¸±ÞµÇ°í ÀÖ´Ù. ÇÏÁö¸¸, µ¥ÀÌÅͺ£À̽º ºÐ¾ß¿¡¼ °¡°Ý µîÀÇ ÀÌÀ¯·Î ´çºÐ°£ Ç÷¡½Ã SSD°¡ Çϵåµð½ºÅ©¸¦ ¿ÏÀüÈ÷ ´ëüÇϱâ´Â ½±Áö ¾ÊÀ» °ÍÀÌ´Ù. ´ë½Å Ç÷¡½Ã SSDÀÇ ºü¸¥ ¼º´ÉÀ» ij½Ã ¿ëµµ·Î È°¿ëÇÏ´Â Á¢±Ù¹ýÀÌ Çö½ÇÀûÀÌ°í, ½ÇÁ¦·Î Çϵåµð½ºÅ©¿Í Ç÷¡½Ã¸Þ¸ð¸®¸¦ ÇÏÀ̺긮µå ÇüÅ·Π»ç¿ëÇÏ´Â Á¢±Ù¹ýµéÀÌ Á¦½ÃµÇ¾ú´Ù.
º» ³í¹®¿¡¼´Â ±âÁ¸ÀÇ Á¢±Ù¹ýµé°ú´Â ´Þ¸®, Ç÷¡½Ã SSD¸¦ µ¥ÀÌÅͺ£À̽ºÀÇ ¹öÆÛ¿¡¼ ¹Ð·Á³ª´Â ÆäÀÌÁöµéÀ» ¼øÂ÷ÀûÀ¸·Î ÀúÀåÇÏ°í, Àç ÂüÁ¶µÉ ¶§ Çϵåµð½ºÅ© ´ë½Å Ç÷¡½Ã SSD¿¡¼ ÀÐÇôÁöµµ·Ï ÇÏ´Â È®Àå ¹öÆÛ ¾ÆÅ°ÅØó¸¦ Á¦¾ÈÇÑ´Ù. Ç÷¡½Ã SSD¸¦ ÀúÀåÀåÄ¡ ·¹º§¿¡¼ ij½Ã·Î »ç¿ëÇÏ´Â ±âÁ¸ ¹æ¹ýµé¿¡ ºñÇØ, Ç÷¡½Ã SSD¸¦ È£½ºÆ® ½Ã½ºÅÛ¿¡¼ È®Àå ¹öÆÛ·Î »ç¿ëÇÔÀ¸·Î½á Àбâ Ãø¸é¿¡¼ ÁÖ ¹öÆÛ¿¡¼ ¹Ð·Á³ª´Â ¿ú ÆäÀÌÁö(warm page)µé¿¡ ´ëÇØ »ó´çÇÑ ¼º´É °³¼±À» ÀÌ·ê ¼ö ÀÖ´Ù. TPC-C Æ®·¹À̽º¸¦ »ç¿ëÇÑ ½Ã¹Ä·¹ÀÌ¼Ç °á°ú, ÁÖ ¹öÆÛ¿¡ ¾ø´Â ÆäÀÌÁöµéÀÌ È®Àå ¹öÆÛ¿¡¼ ã¾ÆÁö´Â ÀûÁß·üÀÌ 60%¸¦ ³Ñ´Â »ç½ÇÀ» ¾Ë ¼ö ÀÖ¾ú´Ù. ÀÌ È®Àå ¹öÆÛ ¾ÆÅ°ÅØó´Â, µ¿ÀÏÇÑ ºñ¿ëÀ» ÁöºÒÇÏ´Â ´Ù¸¥ Á¢±Ù¹ý, Áï DRAMÀ» ¹öÆÛ·Î Ãß°¡ÇÏ´Â ±â¹ý°ú Çϵåµð½ºÅ©¸¦ Ãß°¡ÇÏ´Â ±â¹ý¿¡ ºñÇØ °¡°Ý ´ëºñ ¼º´É °³¼± È¿°ú°¡ ³ô´Ù. |
¿µ¹®³»¿ë (English Abstract) |
As the price of flash memory continues to drop and the technology of flash SSD controller innovates, high performance flash SSDs with affordable prices flourish in the storage market. Nevertheless, it is hard to expect that flash SSDs will replace harddisks completely as database storage. Instead, the approach to use flash SSD as a cache for harddisks would be more practical, and, in fact, several hybrid storage architectures for flash memory and harddisk have been suggested in the literature.
In this paper, we propose a new approach to use flash SSD as an extended buffer for main buffer in database systems, which stores the pages replaced out from main buffer and returns the pages which are re-referenced in the upper buffer layer, improving the system performance drastically. In contrast to the existing approaches to use flash SSD as a cache in the lower storage layer, our approach, which uses flash SSD as an extended buffer in the upper host, can provide fast random read speed for the warm pages which are being replaced out from the limited main buffer. In fact, for all the pages which are missing from the main buffer in a real TPC-C trace, the hit ratio in the extended buffer could be more than 60%, and this supports our conjecture that our simple extended buffer approach could be very effective as a cache. In terms of performance/price, our extended buffer architecture outperforms two other alternative approaches with the same cost, 1) large main buffer and 2) more harddisks. |
Å°¿öµå(Keyword) |
¹öÆÛ °ü¸®
Ç÷¡½Ã¸Þ¸ð¸® SSD
È®ÀåÇü ¹öÆÛ
Buffer Management
Flash Memory SSD
Extended Buffer
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