恢复SDS中坏掉的一块硬盘的数据

东方蜘蛛

一、首先查看当前meta设备状态：
# metastat >$HOME/metastat.0820
# more metastat.0820
d1:Mirror
Submirror 0:d11
State:Okay
Submirror 1:d12
State:Okay
Pass: 1
Read option: roundrobin(default)
Write option: parallerl(default)
Size:4274640 blocks
d 11: Submirror of d1
State:Okay
Hot spare pool: hsp000
Size: 4274640 blocks
Stripe 0:
Device  Start Block Dbase  State Hot spare
C0t0d0s0 0 No Okay
d 12: Submirror of d1
State:Okay
Hot spare pool: hsp000
Size: 4274640 blocks
Stripe 0:
Device  Start Block Dbase  State Hot spare
C3t0d0s0 0 No Okay c2t0d0s0
d2:Mirror
Submirror 0:d21
State:Okay
Submirror 1:d22
State:Okay
Pass: 1
Read option: roundrobin(default)
Write option: parallerl(default)
Size:2049840 blocks
d 21: Submirror of d2
State:Okay
Hot spare pool: hsp000
Size: 2049840 blocks
Stripe 0:
Device  Start Block Dbase  State Hot spare
C0t0d0s1 0 No Okay
d 22: Submirror of d2
State:Okay
Hot spare pool: hsp000
Size: 2049840 blocks
Stripe 0:
Device  Start Block Dbase  State Hot spare
C3t0d0s1 0 No Okay
d3:Mirror
Submirror 0:d31
State:Okay
Submirror 1:d32
State:Okay
Pass: 1
Read option: roundrobin(default)
Write option: parallerl(default)
Size:2049840 blocks
d 31: Submirror of d3
State:Okay
Hot spare pool: hsp000
Size: 2049840 blocks
Stripe 0:
Device  Start Block Dbase  State Hot spare
C0t0d0s3 0 No Okay
d 32: Submirror of d3
State:Okay
Hot spare pool: hsp000
Size: 2049840 blocks
Stripe 0:
Device  Start Block Dbase  State Hot spare
C3t0d0s3 0 No Okay
d4:Mirror
Submirror 0:d41
State:Okay
Submirror 1:d42
State:Okay
Pass: 1
Read option: roundrobin(default)
Write option: parallerl(default)
Size:11430153 blocks
d 41: Submirror of d4
State:Okay
Hot spare pool: hsp001
Size: 11430153 blocks
Stripe 0:
Device  Start Block Dbase  State Hot spare
C2t1d0s0 0 No Okay
d 42: Submirror of d4
State:Okay
Hot spare pool: hsp001
Size: 11430153 blocks
Stripe 0:
Device  Start Block Dbase  State Hot spare
C3t1d0s0 0 No Okay c0t1d0s0
d5:Mirror
Submirror 0:d51
State:Okay
Submirror 1:d52
State:Okay
Pass: 1
Read option: roundrobin(default)
Write option: parallerl(default)
Size:6244749 blocks
d 51: Submirror of d5
State:Okay
Hot spare pool: hsp001
Size: 6244749 blocks
Stripe 0:
Device  Start Block Dbase  State Hot spare
C2t1d0s1 0 No Okay
d 52: Submirror of d5
State:Okay
Hot spare pool: hsp001
Size: 6244749 blocks
Stripe 0:
Device  Start Block Dbase  State Hot spare
C3t1d0s1 0 No Maintence
Hsp000: 3 hot spares
C2t0d0s1 Available 2049840 blocks
C2t0d0s3 Available 2049840 blocks
C2t0d0s0 In use 4274640 blocks
Hsp001: 2 hot spares
C0t1d0s1 Available 2050461 blocks
C0t1d0s0 In use  15620850 blocks
确定meta设备 d52处于维护状态，hsp001池中的hot spare处于使用中，替换了失败的d52。
D52所在的硬盘为：c3t1d0，与这共在同硬盘的还有d42。将d42与d4分离，d52与d5分离：
# metadetach d4 d42
# metadetach d5 d52

二、拔出坏掉的硬盘：c3t1d0，在同一位置插入新的18G硬盘(因为没有同样大小的9G硬盘，所以，只好用18G硬盘来代替。其实，只要容量大于或等于原先硬盘容量就可以了，镜像分区是绝对不能小地，要不，恢复不了地)。
# format
0. c0t0d0  
/pci@1f,4000/scsi@3/sd@0,0
1. c0t0d0  
/pci@1f,4000/scsi@3/sd@1,0
2. c2t0d0  
/pci@6,4000/scsi@4/sd@0,0
3. c2t1d0  
/pci@6,4000/scsi@4/sd@1,0
4. c3t0d0  
/pci@6,4000/scsi@4,1/sd@0,0
5. c3t1d0  
/pci@6,4000/scsi@4,1/sd@1,0
因为是c3t1d0与c2t1d0做的mirror，所以，要配置新硬盘的分区与c2t1d0相同。选择3，查看分区情况
c2t1d0s0: root 5.45gb
c2t1d0s1: usr 2.98gb
c2t1d0s7: alternates 3.51mb
将新硬盘与原硬盘分区设置相同，然后进行下一步工作。

三、1．先把d4设备与新硬盘做连接
# metattach d4 d42
2．恢复坏掉的d5的submirror d52
# metareplace –e d5 c3t1d0s1
3．将spare设备重新放回到hot spare pool中
# metahs –e c0t1d0s0
(如果hot spare处于In Use状态，则无法释放，需要执行以下：
# metareplace –e d4 c3t1d0s0
# metareplace –e d1 c3t0d0s0  

四、因为更换了新的硬盘，所以，原先硬盘上的复制的库文件会丢失，应该对其进行修复。
1、 查看一下当前的复制数据库情况：
# metadb –i
flags  first  blk  block  count
…
…
M p unknown unknown /dev/dsk/c3t1d0s7
2、 删除无效的数据库复制
# metadb –d –f /dev/dsk/c3t1d0s7
3、 确定一下是否被删除
# metadb –I
4、 重启之后，增加复制数据库
# metadb –a –c 2 /dev/dsk/c3t1d0s7
这样，整个的SDS的磁盘恢复算是完成了。

本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u/524/showart_103799.html