这是我的第一个问题，请放心提问。
我有一台在 debian wheezy 上运行的监控服务器。它在 Adaptec Raid 控制器 (IBM ServeRAID 8k-l) 上运行 RAID1 (2x 160GB)。
几天前，其中一个硬盘坏了。所以我用另一个具有 250GB 空间的硬盘替换了它（因为没有 160GB 硬盘）。一切看起来都很好，因为新硬盘已更换，重建已开始。完成后，我从我们的 Nagios raid_aac 检查中收到一条消息：
there are some failed stripes on logical device 0 on controller 1!
在我看来，Raid1 不适用于 Stripes，那么我怎么会收到这个错误消息呢：
Adaptec Raid 控制器的输出：
----------------------------------------------------------------------
Controller information
----------------------------------------------------------------------
Controller Status : Optimal
Channel description : SAS/SATA
Controller Model : IBM ServeRAID 8k-l
Controller Serial Number : 1624F50
Physical Slot : 0
Installed memory : 32 MB
Copyback : Disabled
Background consistency check : Enabled
Automatic Failover : Enabled
Stayawake period : Disabled
Spinup limit internal drives : 0
Spinup limit external drives : 0
Defunct disk drive count : 0
Logical devices/Failed/Degraded : 1/0/0
--------------------------------------------------------
Controller Version Information
--------------------------------------------------------
BIOS : 5.2-0 (17003)
Firmware : 5.2-0 (17003)
Driver : 1.1-7 (28000)
Boot Flash : 5.1-0 (15411)
--------------------------------------------------------
Controller Battery Information
--------------------------------------------------------
Status : Not Installed
----------------------------------------------------------------------
Logical device information
----------------------------------------------------------------------
Logical device number 0
Logical device name : MIRROR
RAID level : 1
Status of logical device : Optimal
Size : 152499 MB
Write-cache mode : Not supported
Partitioned : Yes
Protected by Hot-Spare : No
Bootable : Yes
Failed stripes : Yes
Power settings : Disabled
--------------------------------------------------------
Logical device segment information
--------------------------------------------------------
Segment 0 : Present (Controller:1,Enclosure:0,Slot:1) PVFC44ZHT74KVE
Segment 1 : Present (Controller:1,Enclosure:0,Slot:0) WD-WMAYP0M76S1V
----------------------------------------------------------------------
Physical Device information
----------------------------------------------------------------------
Device #0
Device is a Hard drive
State : Online
Supported : Yes
Transfer Speed : SATA 1.5 Gb/s
Reported Channel,Device(T:L) : 0,0(0:0)
Reported Location : Enclosure 0, Slot 0
Reported ESD(T:L) : 2,0(0:0)
Vendor : WDC
Model : WD2503ABYZ-011FA
Firmware : 01.01S03
Serial number : WD-WMAYP0M76S1V
Size : 239429 MB
Write Cache : Enabled (write-back)
FRU : None
S.M.A.R.T. : No
S.M.A.R.T. warnings : 0
NCQ status : Disabled
Device #1
Device is a Hard drive
State : Online
Supported : Yes
Transfer Speed : SATA 1.5 Gb/s
Reported Channel,Device(T:L) : 0,1(1:0)
Reported Location : Enclosure 0, Slot 1
Reported ESD(T:L) : 2,0(0:0)
Vendor : Hitachi
Model : HDS721616PLA380
Firmware : P22OABCA
Serial number : PVFC44ZHT74KVE
Size : 152627 MB
Write Cache : Enabled (write-back)
FRU : None
S.M.A.R.T. : No
S.M.A.R.T. warnings : 0
NCQ status : Disabled
Device #2
Device is an Enclosure services device
Reported Channel,Device(T:L) : 2,0(0:0)
Enclosure ID : 0
Type : SES2
Vendor : IBM
Model : SAS 2 DRIVE BP
Firmware : 1.10
Status of Enclosure services device
你们有什么提示吗，为什么我收到此通知？
我是否也必须用 250GB 硬盘替换另一个 160GB 硬盘，因为其中一个现在有了更多空间，或者我是否真的必须进行完整备份并创建一个全新的阵列？