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执行命令：megacli -cfgdsply -aall显示如下信息，服务器图片见附件
问题：
1、服务器4块硬盘都亮了，执行命令只显示了2块？
2、BBU: Absent这是什么意思呢
感谢！期待大神解答！
==============================================================================
Adapter: 0
Product Name: PERC H310 Mini
Memory: 0MB
BBU: Absent
Serial No: 45O01IH
==============================================================================
Number of DISK GROUPS: 1
DISK GROUP: 0
Number of Spans: 1
SPAN: 0
Span Reference: 0x00
Number of PDs: 2
Number of VDs: 1
Number of dedicated Hotspares: 0
Virtual Drive Information:
Virtual Drive: 0 (Target Id: 0)
Name :Virtual Disk 0
RAID Level : Primary-1, Secondary-0, RAID Level Qualifier-0
Size : 558.375 GB
State : Optimal
Strip Size : 64 KB
Number Of Drives : 2
Span Depth : 1
Default Cache Policy: WriteThrough, ReadAheadNone, Direct, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAheadNone, Direct, No Write Cache if Bad BBU
Access Policy : Read/Write
Disk Cache Policy : Disk's Default
Encryption Type : None
Default Power Savings Policy: Controller Defined
Current Power Savings Policy: None
Can spin up in 1 minute: Yes
LD has drives that support T10 power conditions: Yes
LD's IO profile supports MAX power savings with cached writes: No
Bad Blocks Exist: No
Physical Disk Information:
Physical Disk: 0
Enclosure Device ID: 32
Slot Number: 0
Enclosure position: 0
Device Id: 0
Sequence Number: 2
Media Error Count: 0
Other Error Count: 0
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
PD Type: SAS
Raw Size: 558.911 GB [0x45dd2fb0 Sectors]
Non Coerced Size: 558.411 GB [0x45cd2fb0 Sectors]
Coerced Size: 558.375 GB [0x45cc0000 Sectors]
Firmware state: Online, Spun Up
SAS Address(0): 0x5000c500ceeceabd
SAS Address(1): 0x0
Connected Port Number: 0(path0)
Inquiry Data: SEAGATE ST600MM0069 ST33WFJ3DX7S
FDE Capable: Not Capable
FDE Enable: Disable
Secured: Unsecured
Locked: Unlocked
Needs EKM Attention: No
Foreign State: None
Device Speed: Unknown
Link Speed: 6.0Gb/s
Media Type: Hard Disk Device
Drive Temperature :29 Celsius
Physical Disk: 1
Enclosure Device ID: 32
Slot Number: 1
Enclosure position: 0
Device Id: 1
Sequence Number: 2
Media Error Count: 0
Other Error Count: 0
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
PD Type: SAS
Raw Size: 558.911 GB [0x45dd2fb0 Sectors]
Non Coerced Size: 558.411 GB [0x45cd2fb0 Sectors]
Coerced Size: 558.375 GB [0x45cc0000 Sectors]
Firmware state: Online, Spun Up
SAS Address(0): 0x5000c5007622b999
SAS Address(1): 0x0
Connected Port Number: 3(path0)
Inquiry Data: SEAGATE ST600MM0006 LS08S0M2QT31
FDE Capable: Not Capable
FDE Enable: Disable
Secured: Unsecured
Locked: Unlocked
Needs EKM Attention: No
Foreign State: None
Device Speed: 6.0Gb/s
Link Speed: 6.0Gb/s
Media Type: Hard Disk Device
Drive Temperature :30 Celsius
Exit Code: 0x00
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