{"id":19275,"date":"2016-08-20T06:57:03","date_gmt":"2016-08-19T22:57:03","guid":{"rendered":"https:\/\/2blog.ilc.edu.tw\/25793\/2016\/08\/20\/%e5%9c%a8-centos-7-x-%e4%b8%ad%e4%bd%bf%e7%94%a8-ssd\/"},"modified":"2021-03-18T17:24:48","modified_gmt":"2021-03-18T09:24:48","slug":"%e5%9c%a8-centos-7-x-%e4%b8%ad%e4%bd%bf%e7%94%a8-ssd","status":"publish","type":"post","link":"https:\/\/2blog.ilc.edu.tw\/25793\/2016\/08\/20\/%e5%9c%a8-centos-7-x-%e4%b8%ad%e4%bd%bf%e7%94%a8-ssd\/","title":{"rendered":"\u5728 CentOS 7.x \u4e2d\u4f7f\u7528 SSD"},"content":{"rendered":"

\u53c3\u8003\u7db2\u9801\uff1a
RHEL7: Extend the life of a SSD. – CertDepot<\/a><\/p>\n

1. \u5099\u4efd\u539f\u6a94
# cp \/etc\/fstab \/etc\/fstab.$(date +%F)<\/span>
2. \u505c\u6b62\u6bcf\u6b21\u5b58\u53d6\u6a94\u6848\u6642\u5beb\u5165 timestamp
# vim\u00a0 \/etc\/fstab<\/span>
\u628a
UUID=ba1f3566-d4af-4abc-93f7-2dde272f8006 \/\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 xfs\u00a0\u00a0\u00a0\u00a0 defaults\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 0<\/span>
\u4fee\u6539\u6210
UUID=ba1f3566-d4af-4abc-93f7-2dde272f8006 \/\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 xfs\u00a0\u00a0\u00a0\u00a0 defaults<\/span>,noatime<\/span> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 0<\/span>[@more@]3. \u5728\u958b\u6a5f\u6642\u57f7\u884c trim
# cp \/etc\/rc.d\/rc.local \/etc\/rc.d\/rc.local.$(date +%F)<\/span>
# vim \/etc\/rc.d\/rc.local<\/span>
\u52a0\u5165
# Trim the SSD at boot<\/span>
\/usr\/sbin\/fstrim \/<\/span>
\/usr\/sbin\/fstrim \/home<\/span>
\/usr\/sbin\/fstrim \/boot<\/span><\/p>\n

4. \u4fee\u6539 \/etc\/rc.d\/rc.local<\/span> \u6b0a\u9650
# chmod 744 \/etc\/rc.d\/rc.local<\/span><\/p>\n

5. \u8a2d\u5b9a\u958b\u6a5f\u6642\u57f7\u884c
# sed -i ‘$an[Install]nWantedBy=multi-user.target’ \/usr\/lib\/systemd\/system\/rc-local.service<\/span>
# systemctl enable rc-local<\/span>
Created symlink from \/etc\/systemd\/system\/multi-user.target.wants\/rc-local.service to \/usr\/lib\/systemd\/system\/rc-local.service.<\/span><\/p>\n

6. Limit swap use
\u4fee\u6539 \/etc\/sysctl.conf<\/span> \u52a0\u5165\u4e0b\u9762\u4e8c\u884c
vm.swappiness=1<\/span>
vm.vfs_cache_pressure=50<\/span>
# sed -i ‘$avm.swappiness=1nvm.vfs_cache_pressure=50’ \/etc\/sysctl.conf<\/span><\/p>\n

7. \u8b93\u8a2d\u5b9a\u751f\u6548
# sysctl -p<\/span>
vm.swappiness = 1<\/span>
vm.vfs_cache_pressure = 50<\/span><\/p>\n

8. Use a SSD-friendly I\/O scheduler
\u4fee\u6539 \/etc\/default\/grub<\/span> \u5728 GRUB_CMDLINE_LINUX \u90a3\u4e00\u884c\u7684\u6700\u5f8c\u9762\u52a0\u4e0a elevator=deadline
# vim \/etc\/default\/grub<\/span>
GRUB_CMDLINE_LINUX=”rhgb quiet ipv6.disable=1 net.ifnames=0 biosdevname=0<\/span> elevator=deadline<\/span>“<\/span><\/p>\n

9. \u7522\u751f\u65b0\u7684 grub \u8a2d\u5b9a\u6a94
# grub2-mkconfig -o \/boot\/grub2\/grub.cfg
<\/span>Generating grub configuration file …<\/span>
Found linux image: \/boot\/vmlinuz-3.10.0-327.28.2.el7.x86_64<\/span>
Found initrd image: \/boot\/initramfs-3.10.0-327.28.2.el7.x86_64.img<\/span>
Found linux image: \/boot\/vmlinuz-3.10.0-327.22.2.el7.x86_64<\/span>
Found initrd image: \/boot\/initramfs-3.10.0-327.22.2.el7.x86_64.img<\/span>
Found linux image: \/boot\/vmlinuz-0-rescue-d1ae217032434f8a908229e3c9aae7ae<\/span>
Found initrd image: \/boot\/initramfs-0-rescue-d1ae217032434f8a908229e3c9aae7ae.img<\/span>
done<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

\u53c3\u8003\u7db2\u9801\uff1aRHEL7: Extend the life of a SSD. – CertDepot … <\/p>\n

\u95b1\u8b80\u5168\u6587\u3008\u5728 CentOS 7.x \u4e2d\u4f7f\u7528 SSD\u3009<\/span><\/a><\/p>\n","protected":false},"author":55,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[117],"tags":[],"class_list":["post-19275","post","type-post","status-publish","format-standard","hentry","category-c-78462"],"meta_key":{"_pingme":["1"],"_encloseme":["1"],"lt_post_id":["650576"]},"_links":{"self":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/19275"}],"collection":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/users\/55"}],"replies":[{"embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/comments?post=19275"}],"version-history":[{"count":1,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/19275\/revisions"}],"predecessor-version":[{"id":20825,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/19275\/revisions\/20825"}],"wp:attachment":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/media?parent=19275"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/categories?post=19275"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/tags?post=19275"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}