1. CERN IT Department CH-1211 Geneva 23 Switzerland www.cern.ch/i t Ruben.Gaspar.Aparicio@cern.ch IT/DB Tests and evolution SSD as flash cache

2. CERN IT Department CH-1211 Geneva 23 Switzerland www.cern.ch/i t Outline IO framework: IOTool IO Tests: –Intel X25-M 160GB SSD –Sun 7410 Storage: ZFS –Netapp: PAM II & FlexClone 2

3. CERN IT Department CH-1211 Geneva 23 Switzerland www.cern.ch/i t IOtool Based on Open source project fio: http://freshmeat.net/projects/fio/ http://freshmeat.net/projects/fio/ It can be used to stress NAS or SAN storage Run from a central server it monitors serveral IO servers –To stress the storage behind –To avoid limitation from a single server –Central point to gather logs –Dashboard from a central machine It can be run standalone on a IO server Perl & Bash 3

4. CERN IT Department CH-1211 Geneva 23 Switzerland www.cern.ch/i t IOtool workflow 4

5. CERN IT Department CH-1211 Geneva 23 Switzerland www.cern.ch/i t OpenLab: Intel X25-M 160GB SSD IOIntelSSDBenchmark.pdf (external/CERN account required)IOIntelSSDBenchmark.pdf Five Intel X-25 M in RAID0. Ext2 file system. Locally attached. Server: 64 cores, 125Gb RAM, RHE5 100GB files Different workload size –Write performance decreases as soon as SSD gets full IO scheduler: noop vs cfq (Completely Fair Queuing) 5

6. CERN IT Department CH-1211 Geneva 23 Switzerland www.cern.ch/i t Intel X25-M: Queue Depth 6 Completion Time (us) Standard Deviation (us) IODEPTH=1288.783124126.295424 IODEPTH=2320.510819135.099729 IODEPTH=4318.405563205.260997 IODEPTH=8372.784486149.152536 IODEPTH=16517.758054184.776984 IODEPTH=32769.693771265.919942 IODEPTH=641307.207774382.034242 IODEPTH=1282405.593282592.249235 IODEPTH=2564809.014412850.041343 IODEPTH=5129610.6208981344.863408

7. CERN IT Department CH-1211 Geneva 23 Switzerland www.cern.ch/i t Intel X-25-M: MB/s & IOPS 7

8. CERN IT Department CH-1211 Geneva 23 Switzerland www.cern.ch/i t Sun Storage 7410 SunStorage7410Benchmark.pdf ZFS: dynamic stripping, compression, deduplication, snapshot, dynamic file system sizing, 128-bits file system … Supports NFS v3 and v4 Web interface (BUI) & CLI Analytics based on Dtrace Several possibilities to configure storage pool(s) Presentation Title - 8

9. CERN IT Department CH-1211 Geneva 23 Switzerland www.cern.ch/i t Sun Storage 7410. ZFS 9

10. CERN IT Department CH-1211 Geneva 23 Switzerland www.cern.ch/i t Sun Storage 7410: ZFS fragmentation Copy on write file system After 30 hours of random writes Defrag functionality will be included in next release. 10

11. CERN IT Department CH-1211 Geneva 23 Switzerland www.cern.ch/i t Netapp: Performance Accelerator Module II 11 FAS3170 running Ontap 7.3.4 with 27 FC data disks 15 rpm, raid_dp. Predictive cache stadistics: –flexscale.lopri_blocks –flexscale.normal_data_blocks MB/sC.Time(us)MB/sC.Time(us)MB/sC.Time(us) 23.991215311.89312116.41211080.9088277.729491628.3538 45.063485665.95807117.68462161.1385764.242193971.2753 73.644536936.01354118.64264299.6303999.801765110.8363 76.737313331.3421118.64758617.1846286.1962911866.698 71.5654328602.0238118.269517300.563286.3466823703.034 73.6318455609.3087118.54234532.228174.1357455230.67

12. CERN IT Department CH-1211 Geneva 23 Switzerland www.cern.ch/i t FAS3170 + PAM II 12

13. CERN IT Department CH-1211 Geneva 23 Switzerland www.cern.ch/i t PAM II: flash vs no flash 13 99% IO completed in less than 0.89 ms

14. CERN IT Department CH-1211 Geneva 23 Switzerland www.cern.ch/i t FAS3140: Flexclone Based on snapshot technology Fast and easy to duplicate production volumes. No extra space involved (0.5% of original parent volume size). Possibility to split the relationship: – vol clone split 14

15. Flexclone: IO Tests No difference among parent and clone volumes Defragmentation should be taken into account on both clone and parent 15

16. CERN IT Department CH-1211 Geneva 23 Switzerland www.cern.ch/i t Questions? 16