Accelerate with ATS: SVC DH8 and V7.3 Code Updates. Byron Grossnickle N.A. Storage Specialty Team. Advanced Technical Skills (ATS) North America
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1 Accelerate with ATS: SVC DH8 and V7.3 Code Updates Byron Grossnickle N.A. Storage Specialty Team
2 Agenda Advanced Technical Skills (ATS) North America New 2145-DH8 Hardware Software Enhancements in SVC Version 7.3 2
3 SAN Volume Controller 2145-DH8 HARDWARE 3
4 Enhancements in SVC DH8 No separate node UPS required Avoids mis-cabling issues; data center daisy-chained UPS concerns Dual, redundant (n+1) PSUs No external redundant AC power switch Two boot drives Boot data mirrored: node will still boot in presence of drive failure Dump data striped for performance Superior system set-up Do not have to input IP addresses via front panel Up to 12 Host I/O ports Allows traffic separation Variable types 4
5 SVC DH8 Front View Boot drives 2 300GB 10K SAS Battery 1 System indicators Battery 2 5
6 SVC DH8 Internal View PCIe Riser cards PSUs DIMMs CPU Fans Boot drives Batteries 6
7 SVC DH8 Hardware Overview 8-core CPU with 32GB memory for SVC Intel E5-2650V2-2.6 GHz Ivy Bridge processor Minimum 1 HIC for I/O Can add a 2 nd I/O HIC, and SAS HIC on this CPU system battery Boot / dump drives 2 nd CPU is optional Comes with extra 32GB memory Required for RTC CPU1 SVC QPI CPU2 RTC Required to access 3 rd I/O HIC At least 1 Compression Accelerator card PCIe Gen3 PCIe Gen3 required for RTC Note: PCI-E Gen3 is roughly double PCI-E Gen-2 used in previous models, 985MB/s vs 500MB/s full duplex. 8 lanes per slot 8GB per slot 7
8 SVC DH8 Rear View Mgmt ports PCIe expansion slots 750W PSUs Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 Slot 6 1 Gb iscsi ports 4 USB ports Technician Port 8
9 SVC - Flexibility Item Min Max in R1 CPU 1x 8-core Ivy Bridge 2x 8-core Ivy Bridge Memory 32GB 64GB FC / 10 Gbps Ethernet cards 1 3 * 12 Gb SAS cards 0 1 Compression accelerator cards 0 2 Supported GA configurations 3 variants Boot drives 2 2 Memory CPU No. I/O cards Number of Compression cards Compression support 32GB 1x 8 core 1 to 2 0 NO 64GB 2x 8 core 1 to 3 * 0 NO 64GB 2x 8 core 1 to 3 * 1-2 YES * Support 3 FC cards, but only one 10Gbps Ethernet card for R1 * Extra 32GB of RAM and the right hand card slot require a 2 nd CPU to be installed. If 2 nd CPU is not installed the user cant use the extra memory or half the expansion cards 9
10 SVC - Flexibility CPU 1 attach Top of Node CPU 2 attach 1 I/O card (FC only) 4 Compression Accelerator card 2 I/O card 5 I/O card 3 SAS (for expansion) 6 Compression Accelerator card There must be at least one Host I/O card but it does not have to be in a particular slot. The 10 Gbps Ethernet card will not fit in PCIe expansion slot 1 or slot 4 but that will be fixed in the future. The SAS card should be in slot 3 It is harder to remove an SFP from slot 1 or slot 4, so if there is only one HIC and one microprocessor it is best to put the HIC in slot 2 A compression card can be in any slot connected to the second microprocessor (i.e. in PCI express riser card assembly 2 nearest the PSUs) 10
11 10Gb Ethernet Card (FCoE and iscsi) The new 4x port 10GbE card will only be supported in the new SVC DH8 and in the Storwize V The card is delivered with the SFPs fitted, unless it is a FRU. In SVC we will only support 1 x 10GbE adapter in each of the platforms (see above) Only IBM supported 10Gb SFPs should be used Each adapter port has amber and green coloured LED to indicate port status (fault LED is not used in ) Green LED On Off Link established No link Meaning iscsi access to volumes is possible via the customers 10 Gbps Ethernet network. FCoE frame routing should be done by FCoE Switch SVC doesn't support multihop FCoE 11
12 Compression accelerator adapter Up to a total of 2 compression accelerator adapters can be installed, each additional adapter installed will improve I/O performance when using compressed volumes Intel QuickAssist technology is used. IBM is the first in the industry to integrate this technology into our products 2 nd CPU and extra 32 GB of memory are compulsory with the compression accelerator adapter The use of compression accelerator adapters is compulsory (at least one) if users wish to use compression on SVC DH8. For an I/O group containing a SVC DH8 with no compression accelerator, an attempt to create first compressed volume will fail. The addnode command will also fail, if trying to add a SVC DH8 without a compression accelerator, to an I/O group which has compressed volumes 12
13 SVC DH8: Compression Support Base hardware: No RTC support Add hardware option 1: 2 nd CPU, 1x Compression Accelerator adapter + 32GB memory: 8 cores dedicated to RTC 1 Compression Accelerator adapter 38GB memory for compression stack (32 additional + 6 from the SVC stack) Additional hardware option 2: 2 nd Compression Accelerator 8 cores dedicated to RTC (same as for option 1) 2 Compression Accelerator adapters (doubles bandwidth) 38GB memory for compression stack (32 additional + 6 from the SVC stack) Note: The 2 nd CPU is required to open the PCIe lanes as well as schedule traffic into and out of the compression accelerator cards 13
14 SVC DH8 Expansion Enclosure F With R1 and 730 support 2 expansion enclosures per I/O Group Ports 1 and 3 of the 12 Gb SAS card can be used to attach 2U24 Expansion enclosures of flash drives Expansion enclosures are physically identical to the V7000 Gen2 expansion enclosures, but will have a different product ID SVC DH8 cannot use the V7000 Gen2 expansion enclosures, V7000 Gen2 cannot use the SVC DH8 expansion enclosure 14
15 Expansion Enclosures SAS Attach IO Group Node 1 Node 2 Expansion Enclosure 1 Expansion Enclosure 2 15
16 SVC CG8 vs DH8 Attribute (per node) SVC CG8 SVC DH8 CPU 2X 6 cores Westmere 2x 8- cores Ivy Bridge Controller memory 24GB to 48GB 32GB to 64GB Host I/O Compression resources 2x 1GbE 4x to 8x - 8Gb FC 2x 10GbE (2 card max) 3x 1GbE 0 to 12x - 8Gb FC 0 to 4x 10GbE (3 I/O card max) 8 cores (with 2 nd CPU fitted) 8 cores (with 2 nd CPU fitted) 1 or 2 Compression Accelerator Card Drive expansion 4 flash drive local to node (RAID 0,1,10 only) SAS fabric 6Gb SAS 12Gb SAS 48 flash drives shared by 2 nodes (RAID 0,1,5,6,10) 16
17 Technician Port (1) Technician port is marked with a T (Ethernet port 4) Technician port is used for the Initialization of the system As soon the system is installed and the user connects to the Technician Port he will be directed to the new Init tool welcome panel This port will run a dedicated DHCP server in order to facilitate service/maintenance and out of box in lieu of the front panel Service IP will NOT be associated with the Technician Port, but will continue to be assigned to Ethernet port 1 (lowest Ethernet port for management) * If the users laptop has DHCP configured, nearly all do, it will automatically configure to bring up Initization screen * If they do not have DHCP they will need to set IP of their Ethernet adapter to
18 Technician Port (2) 2) Waiting panel, while the system initialization completes 1) Example if the enclosure has a stored cluster ID, while attempting to create a cluster 18
19 Technician Port (3) 19
20 SVC DH8: Hardware Upgrade (1) The existing system software must be at a version that supports the new node If a node is being replaced by a 2145 DH8, the system software version must be v7.3.0 or later If the node being replaced is a CG8, CF8 or 8A4 and the replacement node is a DH8 then the replacement node must have a four port FC card in slot 1. If the node being replaced has a second I/O card in addition to the required FC card, then the replacement node must have the same card in slot 2 SVC DH8 will use the new 80c product ID, that provides the ability for a new scheme of WWNN/WWPNs Native 'WWPNs' follow: c <S><P> XXXX Where <S> is the PCIe slot number (1-6) and <P> is the port number in that slot (1-4) XXXX is the sequence number of the SVC DH8 assigned at manufacturing which may be changed by the user if needed for migration WWNN has <S><P><0> 20
21 SVC DH8: Hardware Upgrade (2) New Scheme for SVC DH8 Upgrading to SVC DH8 21
22 Best Practice Port Designations 22
23 SVC - 2 Node (1IOG) Performance SVC CG8 SVC DH8 Cache Read MB/s 6,050 17,000 Cache Write MB/s 3,500 7,000 Cache Read IOPs 800,000 1,150,000 Cache Write IOPs 300, ,000 Disk Read MB/s 5,380 14,000 Disk Write MB/s 2,800 4,000 Disk Read IOPs 365, ,000 Disk Write IOPs 115, ,000 70/30 Mixed IOPs 200, ,000 SUMMARY: DH8 is 2x IOPs and up to 3x MB/s of CG8 SVC tests use FlashSystem 840 and 820 backend storage controllers DH8 includes all 3 FC I/O Cards scales linearly from 1, through 3 for bandwidth Requires 2 cards for max IOPs 1 card approx half, or roughly CG8 equivalent
24 SVC Compression Performance (One I/O Group) Compressed SVC CG8 New SVC DH8 Read Miss IOPS 2,600-50,000 71, ,000 Write Miss IOPS 1,200-16,000 28, ,000 DB-like 2,200-40,000 59, ,000 Compressed performance shows a range depending on I/O distribution Compressed performance is better than uncompressed in some cases because of fewer I/Os to drives and additional cache benefits
25 Statements of Direction IBM intends to enhance the new SVC engine and new Storwize V7000 to support 16 Gb Fibre Channel connectivity The second CPU with 32 GB memory feature on SVC Storage Engine Model DH8 provides performance benefit only when Real-time Compression is used. IBM intends to enhance IBM Storwize Family Software for SVC to extend support of this feature to also benefit uncompressed workloads. 25
26 SAN Volume Controller V7.3 UPDATES 26
27 Storwize Family Software Version 7.3 New Storwize V7000 Unit 2X performance 2X connectivity Up to 1056 drives (clustered) Can be clustered with Gen 1 models New cache design Easy Tier v3 Storage Pool Balancing Miscellaneous Enhancements 27
28 New cache design - why re-architect? More scalable for the future Required for supporting more volumes Required for support more nodes in the cluster Required for 64 bit user addressing beyond 28 GB Required for larger memory sizes in nodes/canisters Required for more CPU cores Reduces # of IOPs copy services do directly to the back end storage Most beneficial to Storwize systems Minimizes FlashCopy prepare time to a second or less RtC benefits from the cache underneath Read-Only cache mode In addition to the read/write or none available today Switch preferred node of a volume with-in same I/O group 28
29 Cache Architecture pre-v7.3.x Host I/O FWL = Forwarding Layer FWL Volume Mirror Front End FWL TP/RtC TP/RtC Remote Copy FWL Virtualization Virtualization Cache FWL RAID 1/5/6/10 RAID 1/5/6/10 Backend Backend FlashCopy 29
30 Cache Architecture V7.3.x Host I/O FWL = Forwarding Layer FWL Volume Mirror Front End FWL TP/RtC TP/RtC Remote Copy Lower Cache Lower Cache Upper Cache FWL Virtualization Virtualization FWL RAID 1/5/6/10 RAID 1/5/6/10 FlashCopy Backend Backend 30
31 Upper Cache Simple 2-way write cache between node pair of the I/O group This is it s primary function Receives write Transfers to secondary node of the I/O group Destages to lower cache Very limited read cache This is mainly provided by the lower cache Same sub-millisecond response time Partitioned the same way as the original cache 31
32 Lower Cache Advanced 2-way write between node pair of an I/O group Primary read cache Write caching for host i/o as well as advanced function i/o Read/write caching is beneath copy servies for vastly improved performance to FlashCopy, Thin Provisioning, RtC and Volume Mirroring 32
33 Upper Cache Allocation - Fixed 4GB V MB All other Platforms 256MB The rest of the cache is designated to the lower cache 33
34 Changing preferred node in 7.3 In 7.3 the movevdisk command can be used to change the preferred node in the i/o group Prior to 7.3, this could not be done without using Non Disruptive Volume Move (NDVM) between i/o groups If no new i/o group is specified, the volume will stay in the same i/o group but will change to the preferred node specified. 34
35 SVC Enhanced Stretch Cluster Old Cache Design Site1 Preferred Node IO group Node Pair Site2 Non-Preferred Node Destage Cache Write Data Cache Data is replicated twice over ISL Mirror Copy 1 Copy2 Storage at Site 1 Storage at Site 2 35
36 SVC Enhanced Stretch Cluster New Cache Design (7.3) Site1 Preferred Node IO group Node Pair Site2 Non-Preferred Node UC Write Data with location UC Destage Mirror Reply with location Data is replicated once across ISL Copy 1 Preferred Copy 2 Non preferred Copy 1 Non preferred LC_1 LC_ 2 LC_1 LC_ 2 Copy 2 Preferred Destage Token write data message with location Destage Storage at Site 1 Storage at Site 2 36
37 Stretch Clustered Old Cache with compression at both Destage Site1 Preferred Node CA IO group Node Pair Uncompressed Write Data Site2 Non-Preferred Node CA Mirror Data is replicated twice over ISL.1 x compressed 1 x uncompressed Cmp Cmp Mdisk FW Compressed Write Data Storage at Site 1 Storage at Site 2 37
38 Enhanced Stretch Cluster with compression at both (7.3) Site1 Preferred Node UCA IO group Node Pair Uncompressed Write Data Site2 Non-Preferred Node UCA Destage Mirror Data is replicated three times over ISL. 1 x uncompressed, 2 x compressed RtC changes buffer location, invalidates UCA location. Copy 1 Preferred C LCA1 C Copy 2 Non preferred LCA 2 Cmp'd Write data Copy 1 Copy 1 Non preferred LCA1 LCA 2 Copy 2 Preferred Destage Cmp'd Write data Copy 2 Destage Storage at Site 1 Storage at Site 2 38
39 Easy Tier v3: Support for up to 3 Tiers Support any combination of 1-3 tiers MDisks in SVC will always show up as Enterprise tier Unless using SSD Expansion drawer, you must designate tier on SVC On other members of the Storwize family the tier of internal disk is known ENT is Enterprise 15K/10K SAS or FC and NL is NL-SAS 7.2K or SATA Tier 0 Tier 1 Tier2 Flash/SSD ENT NL Flash/SSD ENT NONE Flash/SSD NL NONE NONE ENT NL Flash/SSD NONE NONE NONE ENT NONE NONE NONE NL 39
40 Percent of workload Advanced Technical Skills (ATS) North America Easy Tier: Workload Skew Drives Benefits % of the extents do 10% of the MB and virtually no random IOPS! % of the random IOPS and 33% of the MB from about 5% of the extents! Percent of extents 40 Percent of small Ios Percent of MB
41 Easy Tier v3: Planning Deploy flash and enterprise disk for performance Grow capacity with low cost disk Flash Arrays Moves data automatically between tiers New volumes will use extents from Tier 1 initially If no free Tier 1 capacity then Tier 2 will be used if available, otherwise capacity comes from Tier 0 Best to keep some free extents in pool and Easy Tier will attempt to keep some free per Tier Plan for one extent times the number of MDisks in the storage pool plus 16 as Easy Tier will try to keep some extents free in Tiers 0 and 1 if possible E.G. 20 MDisks in an Easy Tier storage pool with either two or 3 MDisk tiers (20*1) + 16 = 36 extents free in the pool if possible Note that as long as one extent free in the pool Easy Tier can operate If no free extents in the pool then nothing will change until more capacity is added to the pool Less Active Data Migrates Down HDD Arrays Active Data Migrates Up 41
42 Easy Tier v3: Automated Storage Pool Balancing Any storage medium has a performance threshold: Performance threshold means once IOPS on a MDisk exceed this threshold, IO response time will increase significantly Knowing the performance threshold we could: Avoid overloading MDisks by migrating extents Protect upper tier's performance by demoting extents when upper tier's MDisks are overloaded Balance workload within tiers based on utilization Use xml file to record the MDisk s threshold and make intelligent migration decisions automatically 42
43 Easy Tier v3: Automated Storage Pool Balancing XML files have stanzas for various drive classes, RAID types/widths and workload characteristics to determine MDisk thresholds Internal drives on Storwize systems we are aware of so more stanzas for them Externally virtualized LUNs we don t know what is behind them so based on controller 43
44 SVC Requires Hints SVC knows what storage array a particular MDisk is coming from, but that is all SVC does NOT own the disks and therefore does not definitively know the performance characteristics Unlike the other members of the Storwize family that own their drives By default, all MDisks will be marked as Enterprise. You must manually designate the tier to which each MDisk belongs. Flash Enterprise Near Line From these 2 things ET will use the XML file to know how hard to drive a particular MDisk 44
45 Easy Tier Adjustments If Easy Tier happens to guess wrong, the workload of a particular MDisk can be adjusted with the chmdisk command from the command line 45
46 Easy Tier v3: Automated Storage Pool Balancing Configuration: Drive MDisk Volume Comments GB 15K RPM Drives 3 - RAID-5 arrays Vol_0, Vol_1, Vol_2, Vol_3 each 32GB capacity Total MDisk size 5.44TB Total Volume size 128GB All Volumes are created on MDisk0 initially Performance improved by balancing workload across all 3 MDisks: Provided as basic storage functionality, no requirement for an Easy Tier license 46
47 Easy Tier v3: STAT Tool Provides recommendations on adding additional tier capacity and performance impact Tier 0: Flash Tier 1: Enterprise disk (15K and 10K) Tier 2: Near-line disk (7.2K) 47
48 Easy Tier v3: Workload Skew Curve Generate the skew report of the workload The workload skew report can be directly read by Disk Magic 48
49 Pool and Tier Easy Tier v3: Workload Categorization 0x0000 0x0001 0x0004 0x Extents 49 Active ActiveLG Low Inactive Unallocated
50 EasyTier v3: Data Movement Daily Report Generate a daily (24hours) CSV formatted report of Easy Tier data movements 50
51 Miscellaneous Enhancements All pool settings can now be changed from the GUI Read only cache mode on volumes 512 compressed volumes per i/o group now allowed with the DH8 51
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