ge (bytes) 8192 - -
MSGMNB Default max size of queue (bytes) 16384 - -
SHMMNI Shared memory segments 4096 0 0.00%
SHMALL Shared memory pages 18446744073692774399 0 0.00%
SHMMAX Max size of shared memory segment (bytes) 18446744073692774399 - -
SHMMIN Min size of shared memory segment (bytes) 1 - -
SEMMNI Number of semaphore identifiers 128 0 0.00%
SEMMNS Total number of semaphores 32000 0 0.00%
SEMMSL Max semaphores per semaphore set. 250 - -
SEMOPM Max number of operations per semop(2) 100 - -
SEMVMX Semaphore max value 32767 - -
# sysctl -a |grep -i shm
kernel.shm_next_id = -1
kernel.shm_rmid_forced = 0
kernel.shmall = 18446744073692774399
kernel.shmmax = 18446744073692774399
kernel.shmmni = 4096
vm.hugetlb_shm_group = 0
# sysctl -a |grep -i sem
kernel.sem = 250 32000 100 128
kernel.sem_next_id = -1
vi /etc/pam.d/login
#ORACLE SETTING
session required /lib64/security/pam_limits.so
nodea、nodeb禁用linux 的透明大页
# vi /etc/rc.local
echo 'never' > /sys/kernel/mm/transparent_hugepage/enabled
echo 'never' > /sys/kernel/mm/transparent_hugepage/defrag
或者
# vi /etc/default/grub
transparent_hugepage=never
nodea、nodeb禁用numba
vi /etc/default/grub
numa=off
nodea、nodeb修改io scheduler
vi /etc/default/grub
elevator=deadline
nodea、nodeb执行下面命令,生成新的grub
grub2-mkconfig -o /boot/grub2/grub.cfg
nodea、nodeb 使用udev绑定硬盘,参考另外一篇博客
获取RESULT,在 Linux 7下，可以使用如下命令：
/usr/lib/udev/scsi_id -g -u /dev/sdb
1ATA_VBOX_HARDDISK_VB204e4375-fd293882
/usr/lib/udev/scsi_id -g -u /dev/sdc
1ATA_VBOX_HARDDISK_VBa364d619-915faa43
/usr/lib/udev/scsi_id -g -u /dev/sdd
1ATA_VBOX_HARDDISK_VB8134c529-40d97810
vi /etc/udev/rules.d/99-oracle-asmdevices.rules
KERNEL=="sd*", SUBSYSTEM=="block", PROGRAM=="/usr/lib/udev/scsi_id --whitelisted --replace-whitespace --device=/dev/$name", RESULT=="1ATA_VBOX_HARDDISK_VB204e4375-fd293882", SYMLINK+="asm-diskb", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="sd*", SUBSYSTEM=="block", PROGRAM=="/usr/lib/udev/scsi_id --whitelisted --replace-whitespace --device=/dev/$name", RESULT=="1ATA_VBOX_HARDDISK_VBa364d619-915faa43", SYMLINK+="asm-diskc", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="sd*", SUBSYSTEM=="block", PROGRAM=="/usr/lib/udev/scsi_id --whitelisted --replace-whitespace --device=/dev/$name", RESULT=="1ATA_VBOX_HARDDISK_VB8134c529-40d97810", SYMLINK+="asm-diskd", OWNER="grid", GROUP="asmadmin", MODE="0660"
重新加载分区
/sbin/partprobe /dev/sdb
/sbin/partprobe /dev/sdc
/sbin/partprobe /dev/sdd
用udevadm进行测试
udevadm test /sys/block/sdb
udevadm info --query=all --path=/sys/block/sdb
udevadm info --query=all --name=asm-diskb
启动udev
/usr/sbin/udevadm control --reload-rules
systemctl status systemd-udevd.service
systemctl enable systemd-udevd.service
检查设备是否正确绑定
# ls -l /dev/asm* /dev/sdb /dev/sdc /dev/sdd
lrwxrwxrwx 1 root root 3 Mar 20 21:58 /dev/asm-diskb -> sdb
lrwxrwxrwx 1 root root 3 Mar 20 22:05 /dev/asm-diskc -> sdc
lrwxrwxrwx 1 root root 3 Mar