{"id":653,"date":"2017-07-05T19:43:38","date_gmt":"2017-07-05T11:43:38","guid":{"rendered":"https:\/\/carlos.aboutmy.info\/blog\/?p=653"},"modified":"2017-07-05T19:43:38","modified_gmt":"2017-07-05T11:43:38","slug":"shrink-an-xfs-partition","status":"publish","type":"post","link":"https:\/\/carlos.aboutmy.info\/blog\/?p=653","title":{"rendered":"Shrink an XFS partition"},"content":{"rendered":"<p>\u773e\u6240\u5468\u77e5\uff0cXFS \u53ea\u53ef\u589e\u5927 (extend)\uff0c\u4e0d\u53ef\u7e2e\u7d30 (shrink)\u3002<\/p>\n<p>\u96d6\u4e0d\u53ef\u7e2e\u7d30\uff0c\u4f46\u5176\u5be6\u53ef\u4ee5\u7528 write zero \u65b9\u6cd5\uff0c\u628a\u7a7a\u9593\u5beb 0\uff0cdump VM \u53ef\u5927\u5927\u6e1b\u5c11 disk image \u7684\u5927\u5c0f\uff0c\u6240\u4ee5\u5176\u5be6\u5f71\u97ff\u4e0d\u5927\u3002<\/p>\n<p>write zero \u6709\u5169\u500b\u65b9\u6cd5\uff0c\u4e00\u662f\u7528 zerofree \u53e6\u4e00\u662f\u7528 dd\uff0czerofree \u9700\u8981 remount \u6210 read-only \u53ca RHEL \u7cfb\u5217\u6c92\u6709\u6b64 package\uff0c\u800c dd \u96d6\u6162\u4f46\u7c21\u55ae<\/p>\n<p><code>$ dd if=\/dev\/zero of=\/tmp\/zero bs=8M; rm \/tmp\/zero<\/code><\/p>\n<p>\u5982\u679c\u771f\u7684\u60f3\u7e2e\u7d30 XFS \u5c31\u552f\u6709\u5efa\u7acb\u4e00\u96bb\u65b0 disk\uff0c\u5982 \/dev\/sdc\uff0c\u4e4b\u5f8c\u628a \/dev\/sdc1 mount \u53bb \/mnt\/sdc1\uff0c\u518d\u7528 xfsdump \u548c xfsrestore<\/p>\n<p><code>$ sudo -s<br \/>\n$ fdisk \/dev\/sdc<br \/>\n$ mkfs.xfs \/dev\/sdc1<br \/>\n$ mkdir \/mnt\/sdc1<br \/>\n$ mount -t xfs \/dev\/sdc1 \/mnt\/sdc1<br \/>\n$ cd \/mnt\/sdc1<br \/>\n$ xfsdump -l0 - \/dev\/sdc1 | xfsrestore -p60 - .<br \/>\n<\/code><\/p>\n<p>\u518d\u7528 blkid \/dev\/sdc1 \u8b80\u53d6 UUID\uff0c\u628a \/mnt\/sdc1\/etc\/fstab \u7684 UUID \u6539\u6389\u53ca\u884c\u4e00\u6b21 grub2-mkconfig \u4fbf\u53ef<\/p>\n<p><code>$ vi \/mnt\/sdc1\/etc\/fstab<br \/>\n$ grub2-mkconfig -o \/mnt\/sdc1\/boot\/grub2\/grub.cfg<br \/>\n<\/code><\/p>\n<p>\u5b8c\u6210\u5f8c\uff0c\u67e5\u770b \/mnt\/sdc1\/boot\/grub2\/grub.cfg\uff0c\u7406\u8ad6\u4e0a UUID \u6703\u63db\u6210 \/dev\/sda<\/p>\n<p>\u5982\u7121\u610f\u5916\uff0c\u95dc\u6a5f\uff0c\u628a\u539f\u6709\u7684 disk \u62d4\u6389\uff0c\u628a sdc \u63db\u6210 sda \u7684\u4f4d\u7f6e\u4fbf\u53ef<\/p>\n<p>\u6700\u5f8c\uff0c\u5982\u559c\u6b61\uff0c\u91cd\u555f\u5f8c\u518d\u884c grub2-mkconfig <\/p>\n<p><code>$ grub2-mkconfig -o \/boot\/grub2\/grub.cfg<\/code><\/p>\n<p>\u5b83\u6703\u628a \/dev\/sda \u8b8a\u56de UUID<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u773e\u6240\u5468\u77e5\uff0cXFS \u53ea\u53ef\u589e\u5927 (extend)\uff0c\u4e0d\u53ef\u7e2e\u7d30 (shrink)\u3002 \u96d6\u4e0d\u53ef\u7e2e\u7d30\uff0c\u4f46\u5176\u5be6\u53ef\u4ee5\u7528 write zero \u65b9\u6cd5\uff0c\u628a\u7a7a\u9593\u5beb 0\uff0cdump VM \u53ef\u5927\u5927\u6e1b\u5c11 disk image \u7684\u5927\u5c0f\uff0c\u6240\u4ee5\u5176\u5be6\u5f71\u97ff\u4e0d\u5927\u3002 write zero \u6709\u5169\u500b\u65b9\u6cd5\uff0c\u4e00\u662f\u7528 zerofree \u53e6\u4e00\u662f\u7528 dd\uff0czerofree \u9700\u8981 remount \u6210 read-only \u53ca RHEL \u7cfb\u5217\u6c92\u6709\u6b64 package\uff0c\u800c dd \u96d6\u6162\u4f46\u7c21\u55ae $ dd if=\/dev\/zero of=\/tmp\/zero bs=8M; rm \/tmp\/zero \u5982\u679c\u771f\u7684\u60f3\u7e2e\u7d30 XFS \u5c31\u552f\u6709\u5efa\u7acb\u4e00\u96bb\u65b0 disk\uff0c\u5982 \/dev\/sdc\uff0c\u4e4b\u5f8c\u628a \/dev\/sdc1 mount \u53bb \/mnt\/sdc1\uff0c\u518d\u7528 xfsdump \u548c xfsrestore $ sudo -s $ fdisk \/dev\/sdc\u2026 <span class=\"read-more\"><a href=\"https:\/\/carlos.aboutmy.info\/blog\/?p=653\">Read More &raquo;<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[17],"tags":[],"_links":{"self":[{"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=\/wp\/v2\/posts\/653"}],"collection":[{"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=653"}],"version-history":[{"count":2,"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=\/wp\/v2\/posts\/653\/revisions"}],"predecessor-version":[{"id":655,"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=\/wp\/v2\/posts\/653\/revisions\/655"}],"wp:attachment":[{"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=653"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=653"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=653"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}