Raid
在raid中啟用新磁碟
我在一次突襲中有一台帶有 2 個磁碟的伺服器,其中一個失敗了。打電話給供應商,讓他們更換磁碟。
重新啟動後,我仍然只看到一個磁碟:
cat /proc/mdstat Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] md2 : active raid1 sda3[0] 1073610560 blocks super 1.2 [2/1] [U_] md3 : active raid1 sda4[0] 1839089920 blocks super 1.2 [2/1] [U_] md0 : active raid1 sda1[0] 16768896 blocks super 1.2 [2/1] [U_] md1 : active raid1 sda2[0] 523968 blocks super 1.2 [2/1] [U_] unused devices: <none>
看起來新驅動器已被刪除:
mdadm -D /dev/md3 /dev/md3: Version : 1.2 Creation Time : Wed Jun 17 00:26:21 2015 Raid Level : raid1 Array Size : 1839089920 (1753.89 GiB 1883.23 GB) Used Dev Size : 1839089920 (1753.89 GiB 1883.23 GB) Raid Devices : 2 Total Devices : 1 Persistence : Superblock is persistent Update Time : Sun Nov 5 15:56:00 2017 State : clean, degraded Active Devices : 1 Working Devices : 1 Failed Devices : 0 Spare Devices : 0 Name : rescue:3 UUID : 0c807ba7:4535e375:273f715a:7ab59c54 Events : 2851 Number Major Minor RaidDevice State 0 8 4 0 active sync /dev/sda4 2 0 0 2 removed
所以問題是如何在 /dev/sdb 中啟用我的新磁碟?當我使用該工具對其進行測試時,它看起來不錯:
smartctl -H /dev/sdb smartctl 6.5 2016-01-24 r4214 [x86_64-linux-4.4.0-98-generic] (local build) Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: PASSED
我該如何進行?
先備份重要數據,最好用dd完整分區(沒有程序寫的時候)。你可以使用這樣的東西:
dd if=/dev/md3 of=/your/backup/path/md3.dump bs=1M
所以如果出現問題,你是安全的……
https://www.howtoforge.com/replacing_hard_disks_in_a_raid1_array