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Difference Between ¡®Ceph Osd Reweight¡¯ and ¡®Ceph Osd Crush Reweight¡¯
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https://ceph.com/geen-categorie/difference-between-ceph-osd-reweight-and-ceph-osd-crush-reweight/


Ceph´Â CRUSH¸¦ ÀÌ¿ëÇؼ­ °ÅÀÇ ¹«ÀÛÀ§·Î µ¥ÀÌÅ͸¦ À§Ä¡ÇÒ °÷À» °áÁ¤ÇÑ´Ù.
ÀÌ´Â ¸ðµç OSD¿¡ Ç×»ó PG±ÕÇüÀ» ¸ÂÃâ ¼ö´Â ¾ø´Ù. ±ÕÇüÀÌ ¸ÂÃçÁöÁö ¾ÊÀº Ceph Ŭ·¯½ºÅÍ º»·¡ ¿ë·®ÀÇ Àüü ÀåÁ¡À» ÃëÇÒ ¼ö ¾øÀ»°ÍÀÌ´Ù. °¡Àå ¸¹ÀÌ ½áÁø OSD°¡ ±× Á¦ÇÑ ¿ë·®¿¡ ºü¸£°Ô µµ´ÞÇÒ °ÍÀ̱⠶§¹®ÀÌ´Ù.

ºÒ±ÕÇü Ŭ·¯½ºÅÍ´Â ¼ö¸¹Àº ¿äûÀÌ ´ëºÎºÐÀÇ PG¸¦ °®°í ÀÖ´Â OSD¸¦ ´ë»óÀ¸·Î ÇÒ °ÍÀÓÀ» ÀǹÌÇÑ´Ù. ÀÌ·¯ÇÑ OSD´Â Ŭ·¯½ºÅÍÀÇ ÀΰøÀûÀÎ ¼º´É ÇÑ°è¿¡ µµ´ÞÇÒ °ÍÀÌ´Ù. 


OSDÀÇ CRUSH °¡ÁßÄ¡¿Í °¡ÁßÄ¡ Àç¼³Á¤(reweight) °ª »çÀÌÀÇ Â÷ÀÌÁ¡
°¡ÁßÄ¡ Àç¼³Á¤ °ªÀ» CRUSH ¾Ë°í¸®Áò¿¡¼­ À߸ø ¹èÄ¡µÈ °ÍÀ» °íÄ¡±â À§ÇØ µ¤¾î¾²±â·Î½á »ç¿ëµÈ´Ù. °¡ÁßÄ¡ Àç¼³Á¤ ¸í·É¾î´Â OSD¿¡¸¸ ¿µÇâÀ» ¹ÌÄ¡°í, ±×¿ä¼ÒÀÎ ¹öŶ(bucket)ÀÇ °¡ÁßÄ¡¿¡´Â ¿µÇâÀ» ¹ÌÄ¡Áö ¾Ê´Â´Ù. ÀÌ´Â OSD°¡ Àç½ÃÀ۵Ǹé 1.0À¸·Î Àç¼³Á¤µÈ´Ù. 

Çѹø ½ÇÇàµÇ¸é CEPH´Â PG¸¦ »õ·Î ÇÒ´çµÈ OSD·Î À̵¿Çϱâ À§ÇØ ¹éÇʸµ(backfilling)À» ½ÃÀÛÇÑ´Ù.
# ceph osd reweight <OSD ¹øÈ£> <°¡ÁßÄ¡ °ª 0.0~1.0>

ÀÚµ¿È­ µµ±¸
# ceph osd reweight-by-utilisation <ÀÓ°èÄ¡>  <Ãִ뺯°æ> <OSD °³¼ö>


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