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Ȩ Ȩ > ¿¬±¸¹®Çå > ±¹³» ³í¹®Áö > Çѱ¹Á¤º¸°úÇÐȸ ³í¹®Áö > Á¤º¸°úÇÐȸ³í¹®Áö (Journal of KIISE)

Á¤º¸°úÇÐȸ³í¹®Áö (Journal of KIISE)

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ÇѱÛÁ¦¸ñ(Korean Title) ¿ÀÇ ä³Î SSD¿¡¼­ ¼º´É °£¼· Á¦°Å¸¦ À§ÇÑ È£½ºÆ® ¼öÁØ I/O ½ºÄÉÁÙ·¯
¿µ¹®Á¦¸ñ(English Title) Host-Level I/O Scheduler for Achieving Performance Isolation with Open-Channel SSDs
ÀúÀÚ(Author) À̼ö¿¬   ÇѱÔÈ­   ½Åµ¿±º   Sooyun Lee   Kyuhwa Han   Dongkun Shin  
¿ø¹®¼ö·Ïó(Citation) VOL 47 NO. 02 PP. 0119 ~ 0128 (2020. 02)
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(Korean Abstract)
ÃÖ±Ù ¼Ö¸®µå ½ºÅ×ÀÌÆ® µå¶óÀ̺ê(SSD)°¡ ÇÏµå µð½ºÅ© µå¶óÀ̺ê(HDD)¿¡ ºñÇØ ³ôÀº I/O ¼º´É ¹× ³·Àº ¿¡³ÊÁö ¼Òºñ¸¦ Á¦°øÇÔ¿¡ µû¶ó ¿©·¯ »ç¿ëÀÚ°¡ ÀÚ¿øÀ» °øÀ¯ÇÏ´Â µ¥ÀÌÅͼ¾ÅÍ ¹× Ŭ¶ó¿ìµå ÄÄÇ»Æà ȯ°æ¿¡¼­ SSDÀÇ »ç¿ëÀÌ È®ÀåµÇ°í ÀÖ´Ù. ÀÌ·¯ÇÑ Àüȯ¿¡ µû¶ó, °¢ »ç¿ëÀÚ¿¡ ¼­ºñ½º Ç°Áú(Quality of Service)À» º¸ÀåÇÏ´Â ¹æ¹ý¿¡ ´ëÇÑ ¿¬±¸°¡ È°¹ßÈ÷ ÀÌ·ïÁö°í ÀÖ´Ù. ÀÌÀü¿¡ Á¦¾ÈµÈ Workload-Aware Budget Compensation (WA-BC) ½ºÄÉÁÙ·¯´Â NVMe SSD¸¦ ¿©·¯ °¡»ó¸Ó½ÅÀÌ °øÀ¯Çϴ ȯ°æ¿¡¼­ °¢ °¡»ó¸Ó½ÅÀÇ QoS¸¦ º¸ÀåÇÑ´Ù. ÇÏÁö¸¸ WA-BC ½ºÄÉÁÙ·¯´Â °¡»ó¸Ó½Åº° ¿öÅ©·Îµå Ư¡À» ¾Ë¾Æ³»±â À§ÇØ ¸ÖƼ ½ºÆ®¸² SSD¸¦ ºÎÀûÀýÇÏ°Ô »ç¿ëÇÑ´Ù´Â Á¡¿¡¼­ Ãë¾àÇÏ´Ù. ¿ì¸®´Â ÀÌ¿Í °°Àº Ãë¾àÁ¡À» º¸¿ÏÇÏ¿© ¿ÀÇ ä³Î SSD¸¦ ¿©·¯ »ç¿ëÀÚ°¡ °øÀ¯Çϴ ȯ°æ¿¡¼­ »ç¿ëÀÚ °£ ¼º´É °£¼·À» Á¦°ÅÇϴ ȣ½ºÆ® ¼öÁØÀÇ I/O ½ºÄÉÁÙ·¯¸¦ Á¦¾ÈÇÑ´Ù. Á¦¾ÈµÈ ½ºÄÉÁÙ·¯´Â SSD ½ºÆ®¸²À» »ç¿ëÀÚº°·Î ÇÒ´çÇÏÁö ¾Ê°íµµ ¿öÅ©·Îµå Ư¡À» I/O ¿äûÀÇ ¿¬¼Ó¼ºÀ» ÅëÇØ ÆľÇÇÑ´Ù. ÀÌ´Â Á¦¾ÈµÈ ½ºÄÉÁÙ·¯°¡ È£½ºÆ® ¼öÁØÀÇ ½ºÄÉÁÙ·¯À̳ª ¿ÀÇ ä³Î SSDÀÇ Æ¯¼ºÀ» È°¿ëÇÏ¿© µð¹ÙÀ̽º ³»ºÎÀÇ Á¤º¸¸¦ ½ºÄÉÁÙ¸µ¿¡ ¹Ý¿µÇÒ ¼ö Àֱ⿡ °¡´ÉÇÏ´Ù. ¿öÅ©·ÎµåÀÇ Æ¯¼ºÀ» ÅëÇØ SSD ³» I/O °£¼·À» ¹ß»ý½ÃÅ°´Â °¡ºñÁö Ä÷º¼Ç¿¡ ´ëÇÑ ±â¿©µµ¸¦ ÆľÇÇÏ°í, ±â¿©µµ°¡ ³ôÀº »ç¿ëÀÚ¿¡ ´ëÇØ Ã³¹úÇÔÀ¸·Î½á ¿ì¸®´Â ½ºÅ丮Áö ÀÚ¿øÀ» °øÀ¯ÇÏ´Â ¿©·¯ »ç¿ëÀÚ °£¿¡ ¹ß»ýÇÏ´Â ¼º´É °£¼·À» Á¦°ÅÇÒ ¼ö ÀÖÀ½À» º» ¿¬±¸¿¡¼­ º¸ÀδÙ.
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(English Abstract)
As Solid State Drives (SSDs) provide higher I/O performance and lower energy consumption compared to Hard Disk Drives (HDDs), SSDs are currently widening its adoption in areas such as datacenters and cloud computing where multiple users share resources. Based on this trend, there is currently greater research effort being made on ensuring Quality of Service (QoS) in environments where resources are shared. The previously proposed Workload-Aware Budget Compensation (WA-BC) scheduler aims to ensure QoS among multiple Virtual Machines (VMs) sharing an NVMe SSD. However, the WA-BC scheduler has a weakness in that it misuses multi-stream SSDs for identifying workload characteristics. In this paper, we propose a new host-level I/O scheduler, which complements this vulnerability of the WA-BC scheduler. It aims to eliminate performance interference between different users that share an Open-Channel SSD. The proposed scheduler identifies workload characteristics without having to allocate separate SSD streams by observing the sequentiality of I/O requests. Although the proposed scheduler exists within the host, it can reflect the status of device internals by exploiting the characteristics of Open-Channel SSDs. We show that by identifying those that attribute more to garbage collection, a source of I/O interference within SSDs, using workload characteristics and penalizing such users helps to achieve performance isolation amongst different users sharing storage resources.
Å°¿öµå(Keyword) ¼­ºñ½º Ç°Áú   ¼Ö¸®µå ½ºÅ×ÀÌÆ® µå¶óÀ̺ꠠ ¿ÀÇ ä³Î SSD   I/O ½ºÄÉÁÙ·¯   ¼º´É °£¼· Á¦°Å   quality of service   solid state drives   open-channel SSDs   I/O scheduler   performance isolation  
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