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3秒自动关闭窗口如图，在平行四边形ABCD中，AD=2AB，M是AD的中点，CE⊥AB于E，如果∠CEM=40°，求∠DME度数 - 同桌100学习网
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如图，在平行四边形ABCD中，AD=2AB，M是AD的中点，CE⊥AB于E，如果∠CEM=40°，求∠DME度数
提问者：popi1254
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延长EM交CD延长线于F因CE⊥AB故CE⊥CD 即三角形CEF为直角三角形又M为AD的中点，可证M为EF的中点即可证CM=EM=FM所以,∠CEM=∠MCE=40°，∠MCF=50°，∠EMC=100°又AD=2AB则可知MD=CD，故，∠CMD=∠MCF=50°则，∠DME=∠EMC+∠CMD=150°
回答者：teacher055
延长EM交CD延长线于F
因CE⊥AB故CE⊥CD 即三角形CEF为直角三角形
又M为AD的中点，可证M为EF的中点
即可证CM=EM=FM
所以,∠CEM=∠MCE=40°，∠MCF=50°，∠EMC=100°
又AD=2AB则可知MD=CD，故，∠CMD=∠MCF=50°
则，∠DME=∠EMC+∠CMD=150°
回答者：teacher013EMC VNX5000系列_百度文库
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你可能喜欢SPECsfs2008_nfs.v3 Result: EMC Corporation - EMC VNX8000 Unified Storage System, 8 X-Blades (including 1 stdby)
SPECsfs2008_nfs.v3 Result
EMC Corporation
EMC VNX8000 Unified Storage System, 8 X-Blades (including 1 stdby)
SPECsfs2008_nfs.v3
580796 Ops/Sec (Overall Response Time = 0.78 msec)
Performance
Throughput(ops/sec)
Response(msec)
Product and Test Information
EMC Corporation
Product Name
EMC VNX8000 Unified Storage System, 8 X-Blades (including 1 stdby)
Hardware Available
August 2013
Software Available
August 2013
Date Tested
August 2013
SFS License Number
Licensee Locations
Hopkinton, MA
The EMC VNX8000 unified storage system with MCx multi-core optimization delivers the highest levels of performance, capacity efficiency, data protection, and ease of use for file- and block-based applications. The configuration tested here consists of an EMC VNX8000 Unified Storage Array with seven active X-Blades and one standby X-Blade.
Configuration Bill of Materials
Model/Name
Description
VNXBRACK-40U
VNXB 40U RACK WITH FRONT PANEL
VNX8000 SPE-EMC RACK
V-V4-230015
VNX 300GB 15K VAULT 25x2.5 DPE/DAE
V4-2S15-300
VNX 300GB 15K SAS 25x2.5 DPE/DAE
V4-2S6F-200
VNX 200GB SSD 25x2.5 DPE/DAE
VNXB6GSDAE25P
VNXB 25x2.5 6G SAS PRI DAE-EMC RACK
VNXB6GSDAE25
VNXB 25x2.5 6G SAS EXP DAE-EMC RACK
VSPBEXPSASBEA
VNXB SAS BE EXP 4 BUSES
VSPBM8GFFEA
VNXB 4 PORT 8G FC IO MODULE PAIR
VNX8000 DME: 2 DM+FC SLIC-EMC RACK
VNXB80DMEX
EMPTY VNX80 DM ENCLOSURE-EMC RACK
VNX8000 ADD ON DM+FC SLIC-EMC RACK
Control Station
VNXB CONTROL STATION-EMC RACK
VDMBMXG2OPA
VNXB 10GBE 2 OP MODULE (2 SFP+)
VNXOE-8000
VNX8000 Operating Environment
UNISU-VNX8000
VNX8000 Unisphere Unified Suite
EXPSAS-V80
Unisphere VNX8000 SAS EXP Software
Nexus 5596
Cisco Nexus 10GbE IP Switch
Server Software
OS Name and Version
VNX File OE 8.1.0.15
Other Software
EMC VNX Control Station Linux 2.6.18-348.1.1.8000.EMC
Filesystem Software
VNX UxFS File System
Server Tuning
Description
ufs updateAccTime
Disable access time updates
file dnlcNents
Directory name lookup cache size
Server Tuning Notes
Disks and Filesystems
Description
Number of Disks
Usable Size
2.5" 200GB 6Gbps SAS flash
2.5" 300GB SAS 15K RPM drive
Number of Filesystems
Total Exported Capacity
Filesystem Type
Filesystem Creation Options
"server_mount server_x -o noprefetch" - disable prefetching for the mounted file system
Filesystem Config
File systems fs0 through fs20 are each striped across 20 LUNs with 256 KB element size. Three file systems were mounted and exported from each X-Blade.
Fileset Size
70318.9 GB
525 of the flash drives are for data, 19 are for hot spares. The flash data drives were configured as 5 drive RAID groups, for a total of 105 RAID groups. Each RAID group hosted 4 4+1 RAID5 LUNs for a total of 420 LUNs, 210 LUNs owned by SPA and 210 owned by SPB.
The file systems were created in a manner that used almost the entire usable capacity (after RAID implementation) of the flash data drives.
After completion of the benchmark, each of the file systems was 94% full.
The benchmark required this number of flash drives be installed in order to attain successful completion due to capacity requirements for the benchmark.
The 5 SAS drives were used for the VNX vault and control volumes for all X-Blades - 4 SAS drives for the vault and 1 SAS drive as a hot spare. The 105 GiB usable size reported for the SAS drives is the amount of space on the drives used by the X-Blades' control LUNs. The remainder of the space on the drives is used by the vault and is hidden from the X-Blades and the end users, thus no user space was available on the SAS drives.
Each client mounted 3 file systems per X-Blade through each network interface of the VNX.
Each client mounted a total of 21 file systems.
Network Configuration
Network Type
Number of Ports Used
Jumbo 10GbE
There are 2 10GbE network interfaces in use per active X-Blade, both ports on the single 10GbE SLIC installed in the X-Blade.
Network Configuration Notes
All 10GbE network interfaces were connected to a Cisco Nexus 5596 switch.
Benchmark Network
An MTU size of 9000 was set for all connections to the switch. Each X-Blade was connected to the network via 2 ports. The X-Blade network ports were used independently - they were not bonded. The LG1 class workload machines were connected with one port each.
Processing Elements
Description
Processing Function
Single socket Intel six core Westmere (Xeon X GHz with QPI speed of 6.4 GT/s for each X-Blade server. 1 chip active for the workload. (1 Processor in the standby X-Blade is not in the quantity.)
VNX8000 X-Blades (NFS protocol, UxFS file system)
Dual socket Intel eight core Sandy Bridge (Xeon E5- GHz with QPI speed of 8.0 GT/s for each VNX8000 SP.
VNX8000 Storage Processors (SCSI, FC, SAS, RAID)
Processing Element Notes
Each X-Blade has one physical processor. There are 7 active X-Blades for a total of 7 physical processors.
Each SP has two physical processors with 8 cores each.
The control station listed in the BOM contains a processor that is not counted for in the list of processors here. The control station is for management only. There is no function of the control station that is in the workload's data path.
Description
Size in GB
Number of Instances
Nonvolatile
Each X-Blade main memory.
(24 GB in the standby X-Blade not in the quantity)
EMC VNX8000 storage array battery backed memory. 128 GB per EMC VNX8000 SP.
The EMC VNX8000 SP memory is used for the VNX OE as well as caching operations.
Grand Total Memory Gigabytes
Memory Notes
There is sufficient battery power to safely destage all cached data to the EMC VNX8000 vault drives in the event of a power failure. The SPs are shut down in an orderly fashion when destaging is complete.
Stable Storage
21 NFS file systems were used.
Each file system was striped over 20 LUNs.
Each VNX8000 X-Blade had 4 Fibre Channel connections directly to the VNX8000 backend array. In this configuration, NFS stable write and commit operations are not acknowledged until after the EMC VNX8000 storage array has acknowledged that the related data has been stored in stable storage (i.e. battery backed memory or disk).
System Under Test Configuration Notes
The system under test consisted of 7 active VNX8000 X-Blades, each directly attached by 4 FC links to the VNX8000 storage array. Of these 4 FC links per X-Blade, 2 were connected to SP A, and 2 were connected to SP B. Each of the two FC links from each X-Blade to each SP were connected to different FC SLICs on the SP. Each SP had 4 FC SLICs for X-Blade connectivity, the other FC SLICs are reserved for block-only/non-NAS access. The X-Blades were running VNX File OE 8.1.0.15. 2 10GbE Ethernet ports per X-Blade were connected to the network.
Other System Notes
Failover is supported by an additional VNX X-Blade that operates in standby mode. In the event of any of the 7 active X-Blades failing, the standby unit takes over the function of the failed unit. The standby X-Blade does not contribute to the performance of the system and it is not included in the active components listed above.
Test Environment Bill of Materials
Model/Name
Description
Cisco C240 M3
Cisco server with 128 GB RAM and the Linux operating system
Load Generators
LG Type Name
BOM Item #
Processor Name
Intel(R) Xeon(TM) E5-2620
Processor Speed
Number of Processors (chips)
Number of Cores/Chip
Memory Size
Operating System
CentOS 6.3 Linux 2.6.32-279.el6.x86_64
Network Type
1 x Intel X520 10GbE
Load Generator (LG) Configuration
Benchmark Parameters
Network Attached Storage Type
Number of Load Generators
Number of Processes per LG
Biod Max Read Setting
Biod Max Write Setting
Block Size
Testbed Configuration
Target Filesystems
/fs0, ..., /fs20
Load Generator Configuration Notes
All file systems were mounted on all clients, which were connected to the same physical and logical network.
Uniform Access Rule Compliance
Each client has all file systems mounted from each active X-Blade.
Other Notes
Failover is supported by an additional VNX X-Blade that operates in standby mode. In the event of the X-Blade failure, the standby unit takes over the function of any failed unit. The standby X-Blade does not contribute to the performance of the system and it is not included in the components listed above.
The EMC VNX8000 was configured with 128 GB of memory per SP. The memory is backed up with sufficient battery power to safely destage all cached data onto the vault drives before shutting down the SP's in an orderly manner in the event of a power failure.
Config Diagrams
Generated on Tue Sep 03 18:31:10 2013 by SPECsfs2008 HTML FormatterCopyright &
Standard Performance Evaluation Corporation
First published at SPEC.org on 03-Sep-2013EMC VNX_VNXE_CX4_CX3_AX4 系列客户日常维护指南&#4..
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EMC VNX_VNXE_CX4_CX3_AX4 系列客户日常维护指南(30)
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