2.5 3.5 sas hdd Â÷ÀÌ°¡ ¸Ö±î¿ä?
Å©·Î·Î 2023-02 2023-02-11 20:52:51 Á¶È¸ 3037 Ãßõ 0
용량이 좀더 많은 3.5 7.2k sas보다 용량이 훨씬 적은 2.5 10k sas 하드가 더 비싸던데 특별히 큰 차이점이..
그정도를 더 지불할 이유가 있을까요?^^;
Ç÷¹ÅÍ rpm ÀÌ 7,200rpm ÀÌ ÀÖ°í 10,000rpm Â¥¸®¿Í 15,000rpm Â¥¸®µéÀÌ ÀÖ½À´Ï´Ù..
7,200rpm Â¥¸®´Â ¶â¾îº¸¸é 3.5ÀÎÄ¡ Ç÷¹Å͸¦ »ç¿ëÇÏ°í 10K rpm /15K rpm Â¥¸®´Â ¶â¾îº¸¸é 2.5ÀÎÄ¡ Ç÷¹Å͸¦ »ç¿ëÇÕ´Ï´Ù..
±×¸®°í ¿ë·®µµ Â÷ÀÌ°¡ Á» ³ª´Âµ¥
7,200rpm Â¥¸®´Â ÀÏ¹Ý PC¿ë HDD¿Í ¿ë·®ÀÌ °°À¸¸ç 10Krpm /15Krpm Â¥¸®´Â ¿ë·®ÀÌ 36 /72/ 142/ 300 /600 /1,200 GB ½ÄÀ¸·Î ³ª°©´Ï´Ù..
ÀÌ´Â º»·¡ ¿£ÅÍÇÁ¶óÀÌÁî HDD¿´´ø SCSI HDDÀÇ ÈÄ°èÀÚ°¡ 10Krpm /15Krpm SAS HDD À̱⠶§¹®ÀÔ´Ï´Ù..
7,200rpm SAS Á¦Ç°Àº ¼º´Éº¸´Ù´Â ¿ë·®À» À§ÁÖ·Î ´ÜÁö ÀÎÅÍÆäÀ̽º¸¸ ¹Ù²ï Á¦Ç°ÀÌ¶ó º¸½Ã¸é µË´Ï´Ù..
DELL °°Àº °÷¿¡¼´Â ÀÌ·± Á¦Ç°À» µû·Î NL-SAS ¶ó°í ºÎ¸£±âµµ ÇÕ´Ï´Ù..
ÇöÀç ±â¼ú·Î´Â 10Krpm /15Krpm À¸·Î µ¹¾Æ°¡´Â Ç÷¹ÅÍÀÇ ÃÖ´ë Å©±â´Â 2.5ÀÎÄ¡ ÀÔ´Ï´Ù.. (3.5ÀÎÄ¡·Î´Â ±×·¸°Ô ¸ø ¸¸µë)
°¡°Ý Â÷ÀÌ°¡ ³ª´Â ÀÌÀ¯´Â 10Krpm /15Krpm ¿¡ µé¾î°¡´Â ±â¼úÀÌ ´õ °í±Þ±â¼úÀÌ°í ºñ½Î±â ¶§¹®À̶ó°í º¸½Ã¸é ´ë·« ¸Â½À´Ï´Ù..
SATA HDDµµ 10K rpm Á¦Ç°ÀÌ Àִµ¥ WDÀÇ ·¦ÅÍ¿Í º§·Î½Ã ·¾ÅÍÀÔ´Ï´Ù..
ÇöÀç´Â ´ÜÁ¾À̶ó Áß°í Á¤µµ ¹Û¿¡ º¸Áö ¸øÇÒ °ÍÀÔ´Ï´Ù..
¼º´ÉÀÌ ÇÊ¿äÇϸé SSD·Î °¡°í, Å« ¿ë·®ÀÌ ÇÊ¿äÇϸé 3.5ÀÎÄ¡ HDD·Î °©´Ï´Ù.
°£È¤ º¥´õ ½ºÅ丮Áö¸¦ µµÀÔÇÏ´Â °æ¿ì, Ç÷¡½Ãº¸´Ù 2.5ÀÎÄ¡ HDDÀÇ °¡°ÝÀÌ ´õ Àú·ÅÇÏ´Ù´Â ÀÌÀ¯·Î HDD ¿É¼ÇÀ» ±¸¸ÅÇÏ´Â °æ¿ì´Â ÀÖ½À´Ï´Ù¸¸, ÀÌ°Ç º¥´õÀÇ °¡°Ý Á¤Ã¥ÀÌ ±×·± °ÍÀ̱⠶§¹®¿¡ ¾î¿ ¼ö ¾ø½À´Ï´Ù.
HDD´Â ¾ÆÁ÷Àº 12G SAS ¹Û¿¡ ¾Èº¸ÀÌ´Â µíÇÕ´Ï´Ù..
10k 15k HDD¸¦ ½è´ø ÀÌÀ¯´Â Àü¼Û¼Óµµ º¸´Ù´Â access time ¶§¹®À̾ú½À´Ï´Ù. 7200 rpm HDDº¸´Ù 10~20%°¡ ¾Æ´Ï¶ó ¹«·Á 2~3¹è ºü¸¥ access time ¶§¹®¿¡ ¿ë·® ÀÛ°í ºñ½ÎÁö¸¸ ¼¹ö¿ëÀ¸·Î ¸¹ÀÌ ¾²¿´¾ú½À´Ï´Ù.
±×·¯³ª SSD°¡ ³ª¿À°í ³ª´Ï SSD´Â 2~3¹è°¡ ¾Æ´Ï¶ó ¼ö½Ê¹è ¼ö¹é¹è°¡ ºü¸£´Ï °æÀïÀÌ ¾ÈµÇ´Â °ÅÁö¿ä. ±×·¡¼ ÀÌ¹Ì ¿À·¡ Àü¿¡ HDD Á¦ÀÛȸ»çµéÀº °í rpm ¼¹ö¿ë HDD¿¡ ´ëÇÑ ÅõÀÚ¸¦ ÁßÁöÇß½À´Ï´Ù. ½ÅÁ¦Ç° °³¹ßÀÌ ÁßÁöµÇ°í »õ·Î¿î »ý»ê½Ã¼³À» ¸¸µéÁö ¾Ê´Ù°¡, ±âÁ¸ÀÇ »ý»ê½Ã¼³µµ ´ëÆø Ãà¼ÒÇÏ¿© ÀϺΠ»ý»ê½Ã¼³À» ³²°Ü ±³Ã¼ ¼ö¿ä¿ëÀ¸·Î³ª ¼Ò±Ô¸ð »ý»êÇÏ´Â Á¤µµ
¿¡·¯°¡ Àû°í ºü¸£°í ³»±¸¼º °ÇÏ¿©
Áַ¼¹ö¿Í °í¼Ó½ºÅ丮Áö·Î ¸¹ÀÌ »ç¿ëÇÕ´Ï´Ù
¼øÀÜÀûÀÎ Á¢±Ù¼Óµµ°¡ ¼¹ö¿¡¼ Áß¿äÇѵ¥
SAS 2.5 10k rpm = 3 ms
Sas 2.5 15k rpm = 2 ms
Sas 3.5 7.2k rpm = 12ms
Sas 3.5 10k rpm = 8ms
Sas 3.5 15k rpm = 5ms
ÀÌ·¸°Ô ¼½ÅÍ Á¢±Ù¼Óµµ Â÷ÀÌ°¡ ÀÖ½À´Ï´Ù
À¥¼ºñ½º³ª ¸¹Àº »ç¶÷µé »ó´ë·Î ÇÏ´Â ¼ºñ½º´Â ÀÛÀº ÆÄÀÏ
¾ï¼¼½º°¡ Áß¿äÇÕ´Ï´Ù
ÀÌ·¡¼ ¼¹öµéÀº 2.5ÀÎÄ¡¸¦ ¾µ¼ö¹Û¿¡ ¾ø½À´Ï´Ù
¼ö¿äµµ ÀÏ¹Ý pc °è¿ Çϵ庸´Ù ¼ö¿äµµ ¸¹Áö ¾Ê¾Æ
°á±¹ °¡°ÝÀº ºñ½Ô´Ï´Ù
¿ë·®À¸·Î °¡°ÝÀ» Ã¥Á¤ÇÏÁö ¾Ê½À´Ï´Ù
Sas´Â 12G ÀÎÅÍÆäÀ̽º°¡ ÀÖ°í
6G ±îÁö¸¸ ÀÖ´Â Sata¿Í ¸¹Àº Â÷ÀÌ°¡ ÀÖ½À´Ï´Ù
* ST225 20MB hdd
https://stason.org/TULARC/pc/hard-drives-hdd/seagate/ST225-21MB-5-25-HH-MFM-ST412.html
form factor : 5.25ÀÎÄ¡
rpm : 3600
Data transfer rate 0.625 MB/S int 0.625 MB/S ext
Seek time / track 65.0/20.0 ms
* Ultrastar DC HC560 20TB hdd
https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/product/data-center-drives/ultrastar-dc-hc500-series/data-sheet-ultrastar-dc-hc560.pdf
form factor : 3.5ÀÎÄ¡
rpm : 7200
Data transfer rate 291/277 MB/S internal
Latency average 4.16 ms
40³â µ¿¾È¿¡ ±â·Ï¹ÐµµÀÇ Áõ°¡·Î ¿ë·®°ú ³»ºÎ Àü¼Û¼Óµµ¿¡ Å« ¹ßÀüÀÌ ÀÖ¾ú½À´Ï´Ù.
¿ë·®Àº 20MB¿¡¼ 20TB·Î 100¸¸¹è°¡ µÇ¾ú½À´Ï´Ù.
³»ºÎ Àü¼Û¼Óµµ´Â 0.625MB/sec¿¡¼ 291MB/sec·Î 400¹è°¡ ÈξÀ ³Ñ°í 500¹è´Â ¾ÈµÇ´Â Á¤µµ·Î ´Ã¾ú½À´Ï´Ù.
seek timeÀ̳ª latency´Â ±×¶§³ª Áö±ÝÀ̳ª ¼ö½Ê ³»Áö ¼ö ms ´ÜÀ§ÀÔ´Ï´Ù. ´ë·« 5¹è Á¤µµ »¡¶óÁ³½À´Ï´Ù.
ST225 : Seek time / track 65.0/20.0 ms
DC HC560 : Latency average 4.16 ms
10000 rpm 15000 rpm HDD´Â À̺¸´Ù ºü¸¨´Ï´Ù.
¿ë·®À̳ª ³»ºÎ Àü¼Û¼ÓµµÀÇ ¹ßÀü¿¡ ºñÇØ access timeÀº ±×¸® Å« ¹ßÀüÀÌ ¾ø¾ú½À´Ï´Ù.
±â¾÷¿ë SSDÀÇ °æ¿ì latency´Â read 100 ¥ìs, write 20 ¥ìs Á¤µµÀÔ´Ï´Ù. Á¦Ç°¸¶´Ù Â÷ÀÌ°¡ ÀÖÁö¸¸ Á» ´À¸®´Ù Çصµ 300 ¥ìs(0.3 ms) ¹Ì¸¸ÀÔ´Ï´Ù.
10000 rpm, 15000 rpm hdd access timeÀÌ ºü¸£´Ù Çѵé SSD¿Í´Â ºñ±³°¡ ¾ÈµË´Ï´Ù.
ÀÌ¿¡ µû¶ó ¼Óµµ´Â SSD, ¿ë·®Àº 3.5ÀÎÄ¡ hdd·Î °¡°í, °í rpm SAS hdd´Â °ÅÀÇ »ç¸Á
* Âü°í
Difference between Seek Time and Rotational Latency in Disk Scheduling
https://www.geeksforgeeks.org/difference-between-seek-time-and-rotational-latency-in-disk-scheduling/
SSD ¶§¹®¿¡ °í rpm HDD°¡ ¸ÁÇÏ°Ô µÇ¾úÁö¸¸ 7200 rpm hdd¿¡ ºñÇØ °í rpm SAS HDD´Â ³»±¸¼ºµµ ÁÁ°í, access timeÀÌ ºü¸£°í ÇÏ¿© ÈξÀ ÁÁÀº ¸ÅüÀÎ °ÍÀº »ç½ÇÀÔ´Ï´Ù.
±×¸®°í UBER °ªÀÌ Â÷ÀÌ°¡ ÀÖÁÒ.
ÀϹݿë hdd : 10^-14
±â¾÷¿ë 7200 rpm SATA / NL-SAS : 10^-15
°í rpm SAS hdd : 10^-16
±â¾÷¿ë SSD : 10^-17
UBER 10^-16ÀÎ SAS hdd³ª ±â¾÷¿ë SSDÀÇ °æ¿ì¿¡´Â raid 5¸¦ »ç¿ëÇÏ´Â °Íµµ ¹«¹æÇÕ´Ï´Ù. ±×·¯³ª 2TB ÀÌ»óÀÇ ÀϹݿë hdd¸¦ raid 5·Î »ç¿ëÇÏ´Â °ÍÀº rebuilding ½Ã Á¶Áú À§ÇèÀÌ ³ô¾Æ »ç¿ëÇÏÁö ¾Ê±â¸¦ ±Ç°íÇÏ°í ÀÖ½À´Ï´Ù. raid 6³ª raid 10 ±ÇÀå
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2.5"¿¡´Â °Å±â¿¡ SSD¶ó´Â °·ÂÇÑ Áö¿ø±ºµµ ÀÖÁö¿ä?