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ext4ÊÇLinuxϵͳÉÏ×î³£ÓõÄÎļþϵͳ֮һ£¬Ëü¾ßÓнϸߵÄÐÔÄܺÍÎȹÌÐÔ¡£¿ÉÒÔͨ¹ý½«ÎļþϵͳÃûÌû¯Îªext4À´ÌáÉý´ÅÅ̵ÄIOÐÔÄÜ¡£

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# umount /dev/sdb1
# mkfs.ext4 /dev/sdb1
# mount -t ext4 /dev/sdb1 /mnt

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ext4Ö§³ÖÁ½ÖÖÈÕ־дÈë·½·¨£ºdata=orderedºÍdata=writeback¡£ÆäÖУ¬data=writebackģʽÏ£¬Êý¾ÝдÈëÑӳٽϵÍ£¬ÐÔÄܸü¸ß¡£¿ÉÒÔʹÓÃÈçÏÂÒªÁìÐ޸ģº

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# tune2fs -o journal_data_writeback /dev/sdb1

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LinuxϵͳĬÈϵÄIOµ÷ÀíÆ÷ÊÇCFQ£¨Completely Fair Queuing£©£¬ËüÊÔͼƾ֤Àú³ÌµÄIOÇëÇó˳ÐòʵÏÖ¹«Õý·ÖÅÉ¡£µ«ÔÚһЩ¸ß¸ºÔس¡¾°Ï£¬¿ÉÄܻᵼÖ´ÅÅÌIOÐÔÄÜϽµ¡£Òò´Ë£¬¿ÉÒÔʵÑéʹÓøüÊʺϵÄIOµ÷ÀíÆ÷£¬Èçnoop¡¢deadlineºÍcfq¡£

ʹÓÃnoopµ÷ÀíÆ÷

noopµ÷ÀíÆ÷ûÓÐÈκε÷ÀíËã·¨£¬Ö»ÊÇƾ֤ÇëÇóµÄ˳Ðò¾ÙÐд¦Àí¡£ÊʺϸßÐÔÄܵÄSSD´ÅÅÌ»òÕßRAID¿¨£¬¿ÉÒÔͨ¹ýÈçÏÂÏÂÁîÐÞ¸ÄIOµ÷ÀíÆ÷£º

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# echo noop > /sys/block/sdb/queue/scheduler

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ʹÓÃdeadlineµ÷ÀíÆ÷

deadlineµ÷ÀíÆ÷½«IOÇëÇó·ÖΪÁ½¸öÐÐÁУºÀú³ÌÌá½»µÄIOÇëÇóÐÐÁкÍÄں˷¢³öµÄIOºÏ²¢ÇëÇóÐÐÁС£ÊʺÏRAID×°±¸ºÍ½ÏΪͨË×µÄÓ²ÅÌ¡£

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# echo deadline > /sys/block/sdb/queue/scheduler

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ʹÓÃcfqµ÷ÀíÆ÷

cfqµ÷ÀíÆ÷ÔÚ¸÷¸öÀú³ÌÖ®¼äƽºâµØ·ÖÅÉIO×ÊÔ´£¬Êʺ϶àʹÃü³¡¾°¡£¿ÉÒÔʹÓÃÈçÏÂÏÂÁîÐÞ¸ÄIOµ÷ÀíÆ÷£º

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# echo cfq > /sys/block/sdb/queue/scheduler

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½¨ÉèRAID×°±¸

# mdadm --create /dev/md0 --level=5 --raid-devices=3 /dev/sdb1 /dev/sdc1 /dev/sdd1

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# mkfs.ext4 /dev/md0

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# mount -t ext4 /dev/md0 /mnt

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# iostat -x 1

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