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4720 24 drives Seq. access test

4720 24 drives Seq. access test. Targeting Video post production use Focusing on sequential access performance Compare R50, host 2 stripe LVM * 2 and 4 stripe LVM DH4720 can hold 24 * SFF(2.5 ”) drives in 2U height chassis. Good form factor if requirement met. Windows 2008 R2 environment

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4720 24 drives Seq. access test

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  1. 472024drives Seq. access test • Targeting Video post production use • Focusing on sequential access performance • Compare R50, host 2 stripeLVM *2and 4 stripeLVM • DH4720 can hold 24 * SFF(2.5”)drives in 2U height chassis. Good form factor if requirement met. • Windows 2008 R2 environment • Better to utilize both of A/B controllers (not single big R50). Vdisks should be owned by each. • Need to utilize LVM/Stripeon host • Even with 24 drives, should use 8Gb*4 connections • Will see bottle neck with two connections earlier • When need single, best performing stream, configure 4 stripeLVM • Total capacity is 600GB * 24 -parity~=11TB • If should be able to use with more WS or users ? It will depends on how their work/behavior overlaps. • Should test NLSAS(1TB)SFFdrives also Dot Hill Systems

  2. 24drv bmkconfig1(storagestripe) DellR610 Windows 2008R2 QLE2564 HBA Iometer 2010 Windows can use directly assigned 12TB*1 volume, with 1 or 2 paths (can be max 4 path when needed) 12TB *1vol 4720 and 4824 24 drives FC-DAS 8Gb * 2 1or 2 path 600GB 10K *6 600GB 10K *6 FRUKA19 (shorty v2 chassis) KF64 (SFF 600GB 10K SAS) HitachHUC1060* x 24 600GB 10K *6 600GB 10K *6 (One * RAID50) 6drive sub R5 x 4 stripes All owned by CUA Chunk size =256k 4824 (CUA only – still redundant) FRUKC54 4* 16G FC,Linear LX, 4GB SandyBridge 1.3GHz SC ASIC (Mangy Moose) 4720 (CUA only – still redundant) FRUKC50 4* 8G FC,Linear FX, 4GB Arrandale 1.8GHz SC Vertex-6 FPGA (Jerboa) Dot Hill Systems

  3. 24 drive RAID50 • All are single controller mapping (max two / ctl) • If having more disks/JBOD, can have twice or more total throughput • 1 port configuration restricted with 8Gbps B/W • Especially on read side • Already seeing sweet spot @256KB IO size • If QD=2 gives best performance, general application can achieve it • If IO block size can be tuned Dot Hill Systems

  4. Configuration2. 2d-LVM*2 3TB R5 3TB R5 DellR610 Windows 2008R2 QLE2564 HBA IOmeter 2010 Create striped volumes using two volumes from same controller (2* workers). Create200GBIOBW.tstfiles on NTFS 3TB R5 3TB R5 4720 and 4824 24 drives 1 chassis FC-DAS 8Gb*2 or 4 1 or 2 vd / port 600GB 10K SAS *6 600GB 10K SAS *6 FRUKA19 (shorty v2 chassis) KF64 (SFF 600GB 10K SAS) HitachHUC1060* x 24 600GB 10K SAS *6 600GB 10K SAS *6 Two * RAID5(A-side) Two * RAID5(B-side) Chunk 512KB 4824 (redundant) FRUKC54 4* 16G FC,Linear LX, 4GB SandyBridge 1.3GHz SC ASIC (Mangy Moose) 4720 (redundant) FRUKC50 4* 8G FC,Linear FX, 4GB Arrandale 1.8GHz SC Vertex-6 FPGA (Jerboa) Dot Hill Systems

  5. R50vs.Host2d-LVM • R50 case is single LUN from storage. Using single controller, two ports. • Difference b/w 2 portsand 4 ports are obvious • LVM *2configuration uses both A/B controllers, 4 ports • One volume performs half of these • Good to utilize more total performance and throughput Dot Hill Systems

  6. Configuration3. 4d-LVM 3TB R5 3TB R5 DellR610 Windows 2008R2 QLE2564 HBA IOmeter 2010 Created host based 4 stripe LVM. Create100GBIOBW.tstfile on NTFS 3TB R5 3TB R5 FC-DAS 8Gb* 2 or 4 1 or 2 vd / port 600GB 10K SAS *6 600GB 10K SAS *6 FRUKA19 (shorty v2 chassis) KF64 (SFF 600GB 10K SAS) HitachHUC1060* x 24 600GB 10K SAS *6 600GB 10K SAS *6 4720 24 drives 1 chassis Two * RAID5(A-side) Two * RAID5(B-side) Chunk 512KB 4720 (redundant) FRUKC50 4* 8G FC,Linear FX, 4GB Arrandale 1.8GHz SC Vertex-6 FPGA (Jerboa) Dot Hill Systems

  7. 2d-LVM*2vs.4d-LVM • @128KB block • 4sLVMread:1GB/s、Wrt:~700MB/s • With 2 volume parallel Read1.5GB/s, Wrt 1GB/s ttal • If can utilize QD=8 • (depends on AP) • Good for Readperformance • Even for 16~64KB IO size • 256KB block on 4sLVM is almost sweet spot Dot Hill Systems

  8. If only QD=1is achievable • To achieve 1GB/s Read, need256KBI/O size • 1GB/s Writeneed 1MB I/O size Dot Hill Systems

  9. WindowsMPIOover-head • Multiple paths / volume doesn’t give best • 1optimumpath: 1path/LUNmapping • 2 optimum path: 4 paths/LUN mapping, two from owner controller • User can notice this difference. Should use MPIO only for HA purpose. • 1 path each from A/B controller, 1 preferred, 1 un-pref./LUN Dot Hill Systems

  10. Ref.1)Linux vs. Windows Linux (Left) vs.Windows(right) • LinuxXFS seems using more aggressive read cache • NTFSsector size: Default used (8KB?) Dot Hill Systems

  11. Ref.2)4720vs.482424drvSeq. • No diference with right load • Okay to use 4720 • 4824 shows better readthroughput • Same for write • 4720 catalog spec(48drive) • Read5,200MB/s1) • Write3,000MB/s 1)Bigger than 6 port * 8Gbps • RandomIOPS • 90K-IOPS@8k • 32K-IOPS@8k Dot Hill Systems

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