Low-cost BYO Mass Storage Project James Cizek Unix Systems

Low-cost BYO Mass Storage Project James Cizek Unix Systems Manager Academic Computing and Networking Services

The Problem Reduced Budget Storage needs growing Storage needs changing (Tiered Storage) I NEED MORE DISK SPACE! (DBA’s!!) Current commercial offerings are not addressing this problem without major budget implications September 21, 2010 CHECO - Fall Conference 2

Projected Needs (2009 Survey) Research Data Storage Need (TBytes) 5,000 4,000 4,914 3,000 2,000 1,384 1,000 - September 21, 2010 219 Now 2 Years CHECO - Fall Conference 5 Years 3

The Goal Find a mass storage solution that won’t break the bank CSU attempted NSF grant to meet this need ( 1 million for 500 TB x 2), but were not awarded the grant (1,000 1 TB drives!!!) Vendors sell high-speed, costly systems (suitable for Amazon, Google, etc.), but we want slower, low-cost – Looking at vendor offerings, we decided to “roll our own” Maximize TB/ with reasonable assurance that data are redundant and safe September 21, 2010 CHECO - Fall Conference 4

Some Understandings Project approached as “Secondary” or “Tier 2” type storage, not intended to replace extremely fast, ultra-reliable, expensive disk systems Device management, support, and component failure need to be addressed September 21, 2010 CHECO - Fall Conference 5

A starting point Online backup company “Backblaze” opensourced their storage pod design, see https://www.backblaze.com/petabytes-on-a-budget-how-tobuild-cheap-cloud-storage.html Starting with a proven design would eliminate many unknowns and speed up our design process Turned out to be helpful, but ran into many of our own headaches September 21, 2010 CHECO - Fall Conference 6

The BackBlaze design September 21, 2010 CHECO - Fall Conference 7

BackBlaze vs. CSU design goals Realized that the BackBlaze design didn’t exactly meet our requirements No redundant power supplies Cheap SATA cards didn’t take advantage of performance available by having large number of spinning hard drives Case too small to accommodate server-class motherboard Single “system” hard drive is single point of failure. Realized the need to over-engineer cooling and vibration reduction (2 major contributors to drive failure) Chassis was red instead of CSU green! September 21, 2010 CHECO - Fall Conference 8

CSU design changes Lengthened case by 3 inches to accommodate dual CPU server-class motherboard Added more RAM for file system buffering (6 GB compared to BackBlaze 4GB) Added larger, redundant power supplies individual supply can run entire case Used “Enterprise” grade drives instead of consumer grade, after much research – Drives selected have vibration sense / damping Replaced cheap SATA cards with highperformance PCI-e cards September 21, 2010 CHECO - Fall Conference 9

CSU chassis nearing completion September 21, 2010 CHECO - Fall Conference 10

CSU chassis nearing completion September 21, 2010 CHECO - Fall Conference 11

Costs Case: 700 1 TB Drives: 100 x 45 ( 4,500) – Drives were purchased earlier this year, now 1.5TB for 100 Motherboard / Processors / Memory: 900 Power Supplies: 200 SATA cards: 300 Ethernet card with iSCSI offload: 350 SATA Multipliers: 45 x 9 ( 405) Fans/Cables/Hardware/DVD/Mounts/etc.: 1,000 Total: 45 Raw TB for 8,355! September 21, 2010 CHECO - Fall Conference 12

Testing Environment Testing was done with both small files and large files (Larger than largest memory buffer) Same data was used for all tests. Allowed us to validate results from various benchmark utilities against each other All RAID configurations were done in multiples of 3 to spread load across as many backplanes as possible All test data below assume worst case (Reads all random, writes all continuous) Highest recorded temperature (excluding CPU exhaust fan) under full load is 100F (ambient office temperature at input, should see even more improvement in datacenter) September 21, 2010 CHECO - Fall Conference 13

Initial Performance 9-Drive Raid 6 Write – 100.32 MB/s 9-Drive Raid 6 Read – 107 MB/s 9-Drive Raid 5 Write – 103.2 MB/s 9-Drive Raid 5 Read – 106.8 MB/s 18-Drive Raid 6 Write – 98.26 MB/s 18-Drive Raid 6 Read – 106 MB/s RAID sets less than 6 drives showed degraded performance, RAID sets above 18 drives showed only small performance benefits September 21, 2010 CHECO - Fall Conference 14

Cost / Performance Comparison We are using IBM DS4300 and DS4700 Fibre channel disk systems as Tier 1 disk in the unix environment. These use 18U and nearly 100K We are using Equallogic (various models) iSCSI arrays for Tier 1 disk in windows environment. P6500E model hold 48 TB but runs near 80K We are using “Jetstor” SATA based products for Tier 2. – 16TB capacity for 8000 Although Fibre channel capable, have no ability to present disk space standalone (i.e. must be connected to a server) DIY disk box is 45 (67) TB for 8300 in 4U September 21, 2010 CHECO - Fall Conference 15

Configuration Much was learned during testing – RAID levels, 5 & 6 tested, 5 faster, but not enough to disregard the added safety of 6. 1 & 10 not considered – Operating system – Debian 64bit Server – Performance testing – unix DD, IOmeter, IOzone Consistent data obtained from all tools – Connection offerings (Fibre, iSCSI, NFS, AOE) Fibre iSCSI NFS (SLOW!!!) AOE (Working out kinks) September 21, 2010 CHECO - Fall Conference 16

Challenges ahead Support management (What happens when a disk fails?) Backup and protection of stored data – Mirroring units – Avoid backing up to enterprise backup system Data storage and protection policies Parallel file system September 21, 2010 CHECO - Fall Conference 17

Where will this be useful? Library digital repository Research computing HPC, tier 2 Campus wide “Cloud” storage Second or Third Tier storage for your Enterprise backups Email/File archiving Database “snapshots” kept for long term (LMS) September 21, 2010 CHECO - Fall Conference 18

What other possibilities? Very large JBOD (Directly attached to server) Linux server offering CIFS/NFS – NAS capability – iSCSI target – Direct connection via FibreChannel (HPC) VMWare ESXi Standalone VM cluster with massive attached storage 4 U server running Windows/Linux/FreeNAS/OpenFiler September 21, 2010 CHECO - Fall Conference 19

Where are we today? September 21, 2010 CHECO - Fall Conference 20

Next steps at CSU Collection of final “parts list” for a complete build Documentation Put it into “semi production” and see how it performs under real-world situations September 21, 2010 CHECO - Fall Conference 21

Resources http://blog.backblaze.com/2009/09/01/petaby tes-on-a-budget-how-to-build-cheap-cloud-sto rage/ (Original BackBlaze project) http://www.ctcustomfab.com (Cases) http://www.chyangfun.com (SATA multipliers) http://www.colostate.edu/curtisb/mass storag e (Wiki on CSU progress) September 21, 2010 CHECO - Fall Conference 22

Questions? [email protected] September 21, 2010 CHECO - Fall Conference 23