designed. engineered. results. Parallel DMF
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1 designed. engineered. results. Parallel DMF
2 Agenda Monolithic DMF Parallel DMF Parallel configuration considerations
3 Monolithic DMF
4 Monolithic DMF DMF Databases DMF Central Server DMF Data File server Data Mover LAN
5 Data Movement Parallelism Recall: same path DMF Central Server MAX_PUT_CHILDREN tape drives at maximum Size of MAX_CHUNK_SIZE per volumes group
6 Parallel DMF (pdmf)
7 Why pdmf technology upgrade Increasing per drive transfer rates MB/s Native Comp 0 LTO-1 LTO-2 LTO-3 LTO-4 LTO-5
8 Why pdmf single server limitation Single server will bottleneck at some point CPU cores do not get equal bandwidth to all memory buffer placement creates bottlenecks DMF, FS, page cache, tape I/O, Not all software layers optimize buffer placement No longer possible to move all the data with a single system
9 pdmf Benefits Scale throughput to/from the tape drives Add mover nodes as needed Provide redundancy Loss of a data mover node Loss of a tape path on a data mover node Lower cost x86_64 hardware small central server HA solution
10 DMF 4.0 is Parallel DMF Current release DMF 4.4.1/ (sles10sp3) 5.0 (sles11) Runs in monolithic configuration traditional way in which DMF has run DMF s data movers run on the DMF server Runs in parallel configuration Scalable way in which DMF 4.x can run DMF s data movers run on dedicated nodes Same DMF code base for parallel & monolithic
11 Parallel DMF LAN DMF Mover CXFS Client NFS/CIFS Servers DMF FS Server CXFS server DMF Mover CXFS Client Shared files space DMF space
12 SGI Scalable Storage Architecture NFS NFS Clients Clients IB IB Network Network 104 GB/s NFS bandwidth 52 Edge Servers 30 GB/s tape bandwidth 10 data movers NFS Edge Server 0 DMF Server (Active) NFS Edge Nodes Throughput per NFS server: 2GB/s aggregate per node, 500MB/s per client, 50MB/s per cp stream G FC Switch Network DMF Server (Passive) DMF Parallel Mover(s) 0 9 DMF Parallel Data Movers 3 GB/s aggregate per node Tier 1 DMF Managed High Performance Tier 2 (DCM) DMF Managed Cost Effective RAID (optional) Tier 3 DMF Managed Tape Tier Tape
13 Data Mover Platform Select hardware targeted for data movement x86_64 better than ia64 Both price and performance Best price/performance mover node C1103 (Rackable server line) 1U / 2 socket / 96 GB DDR3 2 PCI E x16 or 4 PCI E x8
14 Summary of architectural advantages I/O Scalability HA Redundancies Data Movers DMF Server NFS Edge Servers Flexibility choose platforms according to their task DMF Server Data movers NFS Servers Utilization of low cost x86 servers
15 pdmf Considerations
16 Configuration Considerations DMF server needs access to some tape drives backup, dmatsnf, dmatread.. run only on the server Server can optionally be a data mover node too Not all data movers need to see all tape drives Best practice: 2+ movers can see each tape drive If the last mover goes down, tape drive won t get used If no mover can see the tape drive the cartridge might require admin intervention to become usable again (just as today with monolithic DMF)
17 Configuration Considerations DMF user and admin filesystems need to be CXFS filesystems server and mover nodes need fast access to the filesystem Movers need to be able to dmapi reads/writes to the filesystems Disk Cache and Disk MSP All I/O currently done on DMF server
18 Library Robot scheduling Openvault mounting service required for parallel configurations Released version has a limitation in multiarmed ACSLS controlled libraries June release eliminates this limitation asynchronously schedules as many cartridge movements as ACSLS has tape drives
19 Tape drive scheduling General Rules Choose a drive in the same library bay as the cartridge if possible Balance load across mover nodes Balance load across HBA ports within mover nodes If several choices, choose least used drive for wear leveling per mover config param for FC port speed all HBA s should have the same Gb/s port speed chooses a port with the most remaining bandwidth per mover config param for total bandwidth each mover can have different throughput capabilities chooses a mover with the most remaining bandwidth
20 Tape Merge Considerations Socket merges Merges may be done between mover nodes Network bandwidth generally not enough to keep up with modern tape drives When do socket merges occur? files too large to fit in the cache dir filesystem files larger than a configurable size default is files larger than 25% of the the cache dir Recommend tape merges using cache dir
21 SAN Configuration Use FC zoning to isolate tape drives Prevent unexpected tape rewind with risk of data corruption Persistent reserve in OpenVault to come Disk and tape should be on different HBA ports CXFS may fence the disk HBA port
22 SiGI. All rights reserved. SGI, IRIX,, and the SGI logo are registered trademarks and SGI SAN Server, XFS, and CXFS are trademarks of Silicon Graphics, Inc., in the U.S. and/or other countries worldwide. MIPS is a registered trademark of MIPS Technologies, Inc., used under license by Silicon Graphics, Inc. UNIX is a registered trademark of The Open Group in the U.S. and other countries. Intel and Itanium are registered trademarks of Intel Corporation. Linux is a registered trademark of Linus Torvalds. Windows is a registered trademark or trademark of Microsoft Corporation in the United States and/or other countries. All other trademarks are the property of their respective owners. (10/02) Slide 22
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