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1、Dell EqualLogic & CompellentFlash Overview 20 minutes,Sonya R. Sexton Competitive Advantage Team (CAT),Topics,Flash implementation overview Hardware, policies, positioning Functionality caveats Price references Customer adoption, analyst feedback, G2 Futures,2,EqualLogic and SSDs,3,NetApp Confidenti
2、al Limited Use,First introduced in Mar. 2009; auto-tiering in Jun. 2010 Uses Samsung 50GB, 100GB models SLC NAND technology 3Gb/s SAS interface 47K IOPS random read; 29K random write 260MB/s sequential read; 245MB/s sequential write Targeted to two use case scenarios Fixed configs for uniformly busy
3、 workloads Tiered storage configs where small amount of data is predictably hot,EqualLogic PS60x0 S and XVS Models,4,NetApp Confidential Limited Use,EqualLogic S ModelsStatic Tier 0 Fixed configs only: 8- or 16-drive models 50GB or 100GB drives Workloads that are uniformly busy Database-centric apps
4、 (mainly SQL) RAID-10, 2 spares EqualLogic PS60xxXVSAuto-Tiering Fixed configs only: 8x100GB SSD + 8x450GB 15K SAS Configured for “RAID-6 accelerated” with SAS acting as spares Also, sets aside a “small amount” for write caching Writes cached initially and pushed down to disk later Read-intensive da
5、tasets with 20% of workload busy Desktop virtualization (mainly VDI),S model: Up to 3x the random read/write performance of 15K SAS,Intelligent load balancing across SSD and SAS improves read/write performance up to 3x over 15K SAS,Pools foundational to EQL policies Pools: physical segregation of st
6、oragedata pinned in pools 4 pools max in an array group (SAN) 8 members max in a pool Access controls for poolsmulti-tenancy 2 dedicated parity drives in each member, except XVS members Homogeneous media per RAID taxonomy,EqualLogic Tiering Fundamentals,Pool basics Auto-load-balancing within poolnot
7、 across pools Increase capacity by adding member to pool (i.e., capacity avail. only to pool) Move a member to another pool, but must evacuate data off within pool first Homogeneous pools for small environments and performance-sensitive workloads,5,NetApp Confidential Limited Use,Heterogeneous pools
8、 for large organizations, multiple apps SSDs must be in dedicated pools XVS nodes and pools Dedicated pool,1 member Auto-load-balancing only within single XVS member Dataset permanently pinned in poolno evacuation supported,EQL Auto-Load-Balancing Policies,Auto-load-balancing default operation Can b
9、e manually over-ridden by defining a preferred RAID level Algorithms monitor IOPS at volume level (hi, med, lo access patterns) Resituates at the full volume level (uses best available free blockscan be mixed media and RAID in hetero. pools) Moves data using background cycles; slow dynamic process;
10、no control over priority, SLA,6,NetApp Confidential Limited Use,EQL Auto-Tiering on XVS Models,20% total member capacity is SSD; small write cache set aside Uses auto-load-balancing monitoring algorithms (hi, med, low IOPS) Moves data using background cycles (slow, dynamic process; no control over p
11、riority or SLA) If not loaded and write-intensive workload, SSDs will be used for caching initial writes Data migrated down from SSD on demand to make room for SAS hot Moves data at sub-volume level (15 MB pages) “Accelerated RAID-6” only Intended for specific applications (data is permanently pinne
12、d in pool),7,NetApp Confidential Limited Use,SANHQ reports distribution of data by load,EQL Price References,8,NetApp Confidential Limited Use,All-inclusive software stack included in price.,EQL Customer Adoption, Analyst Perceptions, G2,IDC Tracker PS6000S 927 units (ttm) PS6010S 5 units (ttm),Anal
13、ysts, Pundits Not real tiering Focus is on boosting performance for a specific workload, not optimizing use of fat, cheap disks,9,NetApp Confidential Limited Use,G2 Firmware development focused on making logical design more flexible; more flexibility with SSD (addressing pool restrictions) Functiona
14、lity evolution through add-on appliances (e.g., scale-out NAS, deduplication, security) Continue to differentiate on simplicity,Compellent and SSDs,10,NetApp Confidential Limited Use,First introduced in Jul. 2010, auto-tiering inherent in logical design Uses STEC ZeusIOPS drives SLC NAND technology
15、4Gb FC interface, 146GB Targeted to low-latency applicationsoptimization of writes Oracle, SQL logs; 5K-10K Exchange users, OLTP, home-grown apps Surgically deployed for small sub-set of active data No sizer or calculator available to guide configuration decisions,Compellent SBOD,11,NetApp Confident
16、ial Limited Use,Enclosure design FC2 host interface, switched JBOD 3U x 16-bay (14-bays max. when SSD used) Mixed FC and SSD within enclosure Sourced from Xyratec Configuration best practices Tier-0 profile; RAID 10 Three drives minimum (2 + spare) 14 drives maximum (no more than 3 SSDs per SBOD enc
17、losure),Data Progression is the killer app for SSDs,Compellent is the gold standard for auto-tiering; we deliver lowest TCO in industry,Basic operations Tiers: 3 different disk types, 3 different RAID levels, 3 radial ranges Movement: Create read-only snapshots and move down after 12 days of inactivity and up after 3 days of activity; scheduled batch operation; runs in background using free cycles Policies: Customizable tiers; fixed schedule; policies linked to metadata tags for each block of data Granularity: 2MB pages default; option for 512KB and 4MB pages; universal page size recommended,
