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EMC Symmetrix DMX-4 EMC Symmetrix V-Max
Called EMC Symmetrix DMX-4 Called EMC Symmetrix V-Max
DMX: Direct MatrixArchitecture
V-Max: Virtual MatrixArchitecture
Max Capacity: 1 PB RawStorage
Max Capacity: 2 PB of UsableStorage
Max Drives: 1900. On RPQ:2400 max
Max Drives: 2400
EFDs Supported EFDs Supported
Symmetrix ManagementConsole 6.0
Symmetrix ManagementConsole 7.0
Solutions Enabler 6.0 Solutions Enabler 7.0
EFD: 73GB, 146GB, 200GB,400GB
EFD: 200GB, 400GB
FC Drives: 73GB, 146GB,300GB, 400GB, 450GB
FC Drives: 73GB, 146GB,300GB, 400GB
SATA II: 500GB, 1000 GB SATA II: 1000 GB
FC Drive Speed: 10K or 15K FC Drive Speed: 15K
SATA II Drive Speed: 7.2K SATA II Drive Speed: 7.2K
Predecessor of DMX-4 is DMX-3 Predecessor of V-Max is DMX-4
DMX-4 management has got abit easy compared to theprevious generation Symmetrix
Ease of Use with Management atleast with SMC 7.0 or socalled ECC lite
4 Ports per Director 8 Ports per Director
No Engine based concept Engine based concept
24 slots The concept of slots is gone
1 System bay, 9 Storage bays 1 System bay, 10 Storage bays
No engines 8 Engines in one System (serialnumber)
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64 Fiber Channel total ports onall directors for hostconnectivity
128 Fiber Channel total ports ondirectors/engines for hostconnectivity
32 FICON ports for hostconnectivity
64 FICON ports for hostconnectivity
32 GbE iSCSI ports 64 GbE iSCSCI ports
Total Cache: 512GB with 256GB usable (mirrored)
Total Cache: 1024 GB with 512GB usable (mirrored)
Drive interface speed either
2GB or 4GB, drives autonegotiate speed
Drive interface speed 4GB
Green color drive LED means2GB loop speed, Blue colordrive LED means 4GB loopspeed
Only 4GB drive speedsupported.
512 byte style drive (format) 520-byte style drive (8 bytesused for storing data checkinfo). Remember the clariondrive styles, well the datastored in both the cases isdifferent. The 8 bytes used withthe Symmetrix V-Max are thedata integrity field based on thealgorithm D10-TIF standardproposal
FAST: Fully Automated StorageTiering may not be supportedon DMX-4s (most likely sincethe support might come basedon a microcode level ratherthan a hardware level)
FAST: Fully Automated StorageTiering will be supported laterthis year on the V-Max systems
Microcode: 5772 / 5773 runsDMX-4s
Microcode: 5874 runs V-Max
Released in July 2007 Released in April 2009
Concepts of Directors andCache on separate physicalslots / cards
Concept of condensed Directorand Cache on board
DMX-4 Timefinder performancehas been better compared toprevious generation
300% better TImefinderPerformance compared to DMX-4
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No IP Management interfaceinto the Service Processor
IP Management interface to theService Processor, can bemanaged through thecustomers Network IPinfrastructure
Symmetrix ManagementConsole is not charged for until(free) DMX-4
Symmetrix ManagementConsole to be licensed at a coststarting the V-Max systems
Architecture of DMX-4 hasbeen similar to the architectureof its predecessor DMX-3
Architecture of V-Max iscompletely redesigned with thisgeneration and is completelydifferent from the predecessorDMX-4
Microcode 5772 and 5773 hasbe build on previous generationof microcode 5771 and 5772respectively
Microcode 5874 has been buildon base 5773 from previousgeneration DMX-4
No RVA: Raid VirtualArchitecture
Implementation of RVA: RaidVirtual Architecture
Largest supported volume is64GB per LUN
Large Volume Support: 240GBper LUN (Open Systems) and223GB per LUN (MainframeSystems)
128 hypers per Drive (luns perdrive)
512 hypers per Drive (luns perdrive)
Configuration change not asrobust as V-Max Systems
V-Max systems introduced theconcept of concurrentconfiguration change allowingcustomers to perform changemanagement on the V-Maxsystems combined to workthrough single set of scripts
rather than a step basedprocess.
DMX-4 does present somechallenges with mirror
positions
Reduced mirror positions givingcustomers good flexibility for
migration and otheropportunities
No Virtual Provisioning withRAID 5 and RAID 6 devices
Virtual Provisioning allowed nowwith RAID 5 and RAID 6 devices
No Autoprovisioning groups Concept of Autoprovisioninggroups introduced with V-Max
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Systems
Minimum size DMX-4: A single
storage cabinet system,supporting 240 drives can bepurchased with a system
cabinet
Minimum size V-Max SE (single
engine) system can bepurchased with 1 engine and360 drive max.
No concepts of Engine,architecture based on slots
Each Engine consists of 4 QuadCore Intel Chips with either32GB, 64GB or 128GB cache oneach engine with 16 front-endports with each engine. Backendports per engine is 4 portsconnecting System bay tostorage bay
Power PC chips used ondirectors
Intel Quad Core chips used onEngines
Powerpath VE support forVsphere Virtual machines forDMX-4
Powerpath VE supported forVsphere Virtual machines forV-Max
Concept of Backplane existswith this generation of storage
V-Max fits in the category ofModular Storage and eliminatesthe bottle neck of a backplane
DMX-4 was truly sold as ageneration upgrade to DMX-3
V-Max systems have been soldwith a big marketing buzz
around hundreds of engines,
millions of IOPs, TBs of cache,Virtual Storage
Systems cannot be federated The concept of Federation has
been introduced with V-Maxsystems, but systems are notfederated in production orcustomer environments yet
Directors are connected to thesystem through a legacybackplane (DMX DirectMatrix Architecture).
Engines are connected throughcopper RAPID IO interconnect at2.5GB speed
No support for FCOE or 10GBEthernet
No support for FCOE or 10GBEthernet
No support for 8GB loopinterface speeds
No support for 8GB loopinterface speeds
Strong Marketing with DMX-4 Virtual Marketing for VirtualMatrix (V-Max) since the
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and good success product was introduced withFAST as a sales strategy withFAST not available for at leastuntil the later part of the year.
No support for InfiniBand
expected with DMX-4
Would InfiniBand be supported
in the future to connect enginesat a short or long distance(several meters)
No Federation With Federation expected in theupcoming versions of V-Max,how would the cache latencyplay a role if you had federationbetween systems that are 10 to10 meters away?
Global Cache on GlobalMemory Directors
Global Cache on local engineschips: again as cache is shared
between multiple engines,cache latency is expected asmultiple engines request this IO
DMX-4 is a monster storagesystem
The V-Max building blocks(engines) can create a muchlarger storage monster
256GB total vault on DMX-4systems
200GB of vault space perEngine, with 8 engines, we arelooking at 1.6TB of vaultstorage
Performance on DMX-4 hasbeen great compared to itsprevious generation DMX,DMX2, DMX-3
IOPS per PORT of V-MaxSystems
128 MB/s Hits
385 Read
385 WriteIOPS for 2 PORT of V-MaxSystems
128MB/s Hits
635 Read
640 Write
V-Max performs bettercompared to DMX-4 FICON
2.2 x Performance on FICONcompared to DMX-4 Systems.
2 Ports can have as many as
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17000 IOPS on FICON
Large Metadata overhead withthe amount of volumes,devices, cache slots, etc, etc
A reduction of 50 to 75%overhead with the V-Maxrelated to metadata
SRDF Technology Supported New SRDF/EDP (extended
distant protection)
Diskless R21 passthroughdevice, no disk required for thispassthrough
Symmetrix ManagementConsole 6.0 supported, no
templates and wizards
Templates and Wizards withinthe new SMC 7.0 console
Total SRDF Groups supported
128
Total SRDF Groups supported
250
16 Groups on Single Port forSRDF
64 Groups on Single Port forSRDF
V-Max comparison onConnectivity
2X Connectivity compared tothe DMX-4
V-Max comparison on Usability(Storage)
3X usability compared to theDMX-4
DMX-4 was the first version ofSymmetrix where RAID6support was rolled out
RAID 6 is 3.6 times better thanthe DMX-4
RAID6 support on DMX-4 isand was a little premature
RAID 6 on V-Max (performance)is equivalent to RAID 1 on DMX-4
SATA II performance on DMX-4
is better than V-Max
SATA II drives do not support
the 520-byte style. EMC takesthose 8 bytes (520 512) of
calculation for data integrityT10-DIF standard proposal andwrites it in blocks or chunks of64K through out the entire drivecausing performancedegradation.
SATA II performance on DMX-4is better than V-Max
The performance of SATA IIdrives on V-Max is bad theDMX-4 systems
Fiber Channel performancebetter compared to DMX and
DMX-2s.
Fiber Channel performancecompared to DMX-4 improved
by about 36%
DMX-4 start supporting 4GBinterface host connectivity
Fiber Channel performance5000 IOPS per channel
RVA not available on DMX-4platforms
RVA: Raid Virtual Architectureallows to have one mirrorposition for RAID volumesallowing customers to used therest of the 3 positions for eitherBCVs, SRDF, Migration, etc,
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etc.
No MIBE and SIB with DMX-4.Rather the DMX-4 directors areconnected through a commonbackplane.
MIBE: Matrix Interface BoardEnclosure connects the Odd andthe Evens or (Fabric A andFabric B) Directors together.The SIB (System Interface
Board) connects these enginestogether using Rapid IO
Director count goes fromDirector 1 on the left toDirector 18 (Hex) on the right
Director count goes from 1 onthe bottom to 16 (F) on the top,based on each engine having 2directors. 8 Engines, 16Directors.
2 Directors failures if not in thesame fabric or bus, rather arenot DIs (Dual Initiators) ofeach other will not cause asystem outage or data loss /data unavailable
Single engine failure (2Directors) will not cause DataLoss / Data Unavailable and thesystem will not cause anoutage. Failed components canbe Directors, Engines, MIBE,
PSs, Fan, Cache in a singleEngine or 2 directors.
Single loop outages will notcause DU
Single loop outages will notcause DU