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Huawei RAID 2.0+ Technical Training
Date: March. 5, 2015
HUAWEI TECHNOLOGIES CO., LTD.
Huawei Confidential
Teacher name Background
Project Experience
Teacher name
Specialist Skills
position [email protected]
+0086 1888888888
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Page 1
Content 1
Principle and Concept of RAID 2.0+
2
Highlights of RAID 2.0+
3
Comparison of RAID Virtualization Technologies
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RAID Technology Evolution
Hot spare
Hot spare
Traditional RAID
LUN virtualization EMC: VNX HDS: VSP IBM: DS8000
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Block virtualization Huawei: RAID 2.0+ HP 3PAR: Fast RAID IBM XIV: Super stripe
LUN Virtualization LUN
Cell
RAID group Disk Hot Spare disk
Hot Spare disk
Lower system reliability: LUN reliability is reduced to 1/N of a single RAID group. HUAWEI TECHNOLOGIES CO., LTD.
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Block Virtualization LUN
Cell
RAID
Disk
Hot spare space
Higher system reliability: Reconstruction of a single disk is faster & the reconstruction impact is mitigated. HUAWEI TECHNOLOGIES CO., LTD.
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Logical Objects Involved in RAID 2.0+ Disk Domain Storage Pool Tier
Chunk
CKG
Extent
Grain
Volume
LUNs are visible to hosts.
Tiered
Not tiered
Not tiered
Storage Pool
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File systems are visible to hosts.
Content 1
Principle and Concept of RAID 2.0+
2
Highlights of RAID 2.0+
3
Comparison of RAID Virtualization Technologies
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Automatic Load Balancing, decrease the Overall Failure Rate
Duty Cycle: indicates the percentage of disk working time to total disk power-on time AFR: indicates the annual failure rate
RAID 2.0+ prevents unbalanced loads to decrease the overall failure rate of a storage system.
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A More Reliable System with 20 Times Data Reconstruction Speed Reconstruction principle of traditional RAID
Reconstruction principle of RAID 2.0+
RAID 2.0+ shortens the time from 10 hours to 0.5 hour.
Traditional RAID reconstruction speed is 30 MB/s, so reconstruct 1 TB data need 10 hours. Real test by Huawei, to reconstruct 1 TB data, RAID 2.0+ shortens the time from 10 hours to 30 minutes.
Few-to-One Rebuild
hotspots & long rebuild exposure HUAWEI TECHNOLOGIES CO., LTD.
Many-to-Many Rebuild
parallel rebuilds in less time Huawei Confidential
Simplifying Storage Planning and Management
0
1
2
3
4
5
6
7
0
R1 R1 R5 R6 R6 R1 R5 R5 RAID5
RAID1
RAID6
LUN 5
LUN 4 LUN 3
RAID1
3
4
5
6
7
R1 R1 R5 R6 R6 R1 R5 R5
RAID5 LUN 2
Spare
LUN 0 LUN 1
2
Spare
LUN 6 LUN 7
1
Huawei RAID 2.0+
Traditional RAID
Traditional RAID
Huawei RAID 2.0+
The administrator must complete the planning of the disks, the RAID groups, and the LUNs before the configuration process begins.
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The administrator does not waste time on the detailed planning of the storage resource.
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Content 1
Principle and Concept of RAID 2.0+
2
Highlights of RAID 2.0+
3
Comparison of RAID Virtualization Technologies
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HP 3PAR StoreServ 10000 FPVV s
CPG TPVV s
Physical Disks
Chunklet Physical disk space divided into 256 MB or 1 GB units
Logical Disks The chunklets form Logical Disks(LD).
HP 3PAR Fast RAID
Host
The Virtual Volume(VV) request storage space from several LD.
Huawei RAID 2.0+
The chunklet size is 256 MB or 1 GB, and the virtual volume size is 32 MB.
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Virtual Volumes
The size of chunk is 64 MB, and the size of extent is 512 KB to 64 MB. It fits different applications well.
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EMC VMAX Series Meta volume
Volume
Disk group Hot spare
Hyper Volume
EMC VMAX
Huawei RAID 2.0+
The Hyper Volume size is from several GB to over 100 GB
The size of chunk is 64 MB, more efficient
The hot spare space is offered by a hot spare disk, so it will become a bottleneck when the system start to reconstruct.
The hot spare space is distributed on all the disks in a disk domain, so there is no bottleneck in storage system. No bottleneck
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IBM XIV Logical volume
Data Module
Data Module
Stripe 1MB
IBM XIV
Huawei RAID 2.0+
Each logical volume is divided into multiple stripes of 1MB
The size of chunk is 64 MB
Each Stripe have a duplicate copy on another disk Configurable RAID policy and hot spare policy Low capacity efficiency, less than 50%
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Summary Product RAID Tech
RAID level
Hot spare
Chunk size
Extent size
reconstruction
Huawei V3 RAID2.0+
Block
space
64M
512K-64MB
Fast, no bottleneck, rebuild less data
HP 3PAR FAST RAID
Block
space
256M or 1GB
64MB
Fast, no bottleneck, rebuild less data
IBM XIV Super stripe
Block
space
1M
N/A Space utilization < 50%,Limited capacity,
Fast, no bottleneck, rebuild less data
EMC VMAX
Block
Disk
GB ~100GB
7.5 MB
Slow, bottleneck, rebuild more data
EMC VNX2
Disk
Disk
N/A
256 MB
Slow, bottleneck, rebuild more data
HDS VSP
Disk
Disk
N/A
42 MB
Slow, bottleneck, rebuild more data
IBM DS8000
Disk
Disk
N/A
1GB
Slow, bottleneck, rebuild more data
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