原始链接：http://geekdoctor.blogspot.com/2009/06/our-storage-backup-strategy.html
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Our Storage and Backup Strategy从 Life as a Healthcare CIO 作者：John Halamka
Overthe past year, Harvard Medical School has worked with research,administrative, and educational stakeholders to develop a set ofstorage policies and technologies that support demand, are achievablein the short term and are affordable.
I recently gave a keynote at Bio-IT World where I described the HMS storage strategy to ensure scalability, high performance, and reliability.
Sincethat presentation, we've refined our strategy forreplication/backup/restoration of data for disaster recovery. In manyways backup is a harder problem to solve and a more expensive projectthan data storage itself.
Our best thinking (a strawman for now that we are still reviewing with customers) is outlined on this slide
Fordatabases and Microsoft exchange, we're using Data Domain appliances toreplace tape and using the following backup schedule - 3 days ofcheckpoints, 14 days of incremental backups, 60 days of weeklycumulative incremental backups and 3 months of full backups
Forresearch data and administrative data, we're creating 1 checkpointdaily for 14 days and 1 checkpoint weekly for 60 days. Data is fullyreplicated between two datacenters.
The reason we have chosen replication and checkpoints is 3 fold:
1.Costs - We are able to reduce costs significantly using largequantities of a single reasonably priced storage system. It's actuallycheaper for us to have a large quantity of a single storage type, thenreplicate our data using simple tools than it is to have multiple tiersof storage for short term, backup, and long term storage. The researchcommunity is very sensitive to the cost of storage, so we need tobalance risk and cost. Replication with checkpoints does that nicely.
2.Technological simplicity - With every different storage type comes adifferent set of tools and a learning curve. Having one set of storageand one set of tools for our administrative files and researchcommunity results in a much easier environment to maintain.
3.Requirements of customers are met - We have asked our customers fortheir input on the need for file recovery and retention. Usingcheckpoints and replication meets the majority of their needs. Somedepartments have asked not to replicate at all, since it is cheaper torerun an experiment than to replicate the terabytes of data eachexperiment generates.
Storage is a journey. The needs of BIDMCand the needs of Harvard Medical School are different so the choice oftechnologies and the balance of reliability/cost is different. Byworking with customers and embracing evolving storage technologies webelieve we can meet the demand for storage at a price theinstitution/our customers are willing to pay. |
发表于 2009-7-10 14:41:53