DELL PowerEdge R720
LSI MegaRaid 9271-8i
DELL SAS 15k 600G 2EA - Raid 1
Intel 520 SSD 120G
CacheCade는 readonly로 설정
1. ssd cache disable / Always Write Back / Always Read Ahead / Cached IO / Disk Cache Enabled
2. ssd cache enable / Always Write Back / Always Read Ahead / Cached IO / Disk Cache Enabled
3. ssd cache enable / Always Write Back / Always Read Ahead / Direct IO / Disk Cache Enabled
- to be continue -
Direct IO ¶§¹®ÀÎÁö SSD 1°³ÀÇ ¼Óµµ°¡ ³ª¿À´Â °Í °°½À´Ï´Ù.
4kbÀÇ read¸¸ ÁÁ¾ÆÁö°í ÀüüÀûÀ¸·Î ³ªºüÁý´Ï´Ù.
ssd 2°³¸¦ raid 1À¸·Î ¹À¸¸é read´Â 2¹è·Î ¿Ã¶ó°¡°ÚÁÒ?
½ÇÀü¿¡¼´Â 4kbÀ̹ǷΠ4kb¸¦ ¾²´Â°Ô ¸Â´Â °ÍÀΰ¡¿ä?
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È°¼ºÈ¿Í ºñÈ°¼ºÈÀÇ Â÷ÀÌ°¡ º°·Î ¾ø¾îº¸À̳׿ä.
Á¦ Å×½ºÆ® ±Û 2°³ ´Ù º¸½Ã¸é ¾Æ½Ã°ÚÁö¸¸, cachecade on/off ½Ã 4k ·£´ý°ªÀÌ 4~6¹èÁ¤µµ Â÷ÀÌ´Â ÀÖ¾ú½À´Ï´Ù.
´Ü, cachecade Ư¼º»ó ½ÃÄö¼ÈÀÌ ¶³¾îÁö´Â °Ç ¾î¿ ¼ö ¾ø½À´Ï´Ù.
¶ÇÇÑ, ÀúÈñ °°Àº °æ¿ì 520 ¸ðµ¨À» ¾²¸é¼ 180G¸¦ ½è´ø ÀÌÀ¯Áß Çϳª°¡ 180G¿Í 120G´Â ¼º´É»ó IOPS Â÷ÀÌ°¡ ¸¹¾Ò½À´Ï´Ù. ¶§¹®¿¡ 180G¸¦ ÃÖÀú ¸¶Áö³ë¼±À¸·Î Àâ°í ÁøÇàÇß¾ú½À´Ï´Ù.
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Cachecade on(readonly) + direct io
SSDÀÇ iops ¶§¹®Àϱî¿ä?
iops°¡ ³ôÀº ssd·Î º¯°æÀ» ÇÏ¸é ³ô¾ÆÁú±î¿ä?
ÀÎÅÚ 520 120GB ssd - 4k random read 25,000 IOPS
ÀÎÅÚ 520 180GB ssd - 4k random read 50,000 IOPS