From,File,Systems,The,Cloud,An communication From File Systems To The Cloud And Back

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Cloudstorage solutionstoday are a great alternative to storing data on local computer or inNAS storage. Started with Amazon S3, such solutions are offered by adozen of companies, including Microsoft with their Azure BlobStorage. Theadvantages of cloud storages are nearly infinite storage capacity(use as much as you need, not as you have), the distance between thestorage and your location (the data won't be lost in an accident orfire, and access of third parties to your data is severely limited),lowered cost of data management. Atthe same time cloud storages work in the way that doesn't matchregular approaches to storage access, such as hierarchical filesystems and relational databases. Internally designed as huge tableswith an index and BLOB field for data, they don't give enoughflexibility that file systems or database management systems canoffer to the developer and user. The developer needs to performtranslation between the data he has in the application and theback-end cloud storage.Onemore significant disadvantage is a difference between APIs, offeredby different services. While most of services offer so-called RESTAPI, this API is in fact a format for requests and responses sentover HTTP. Request commands, parameters and functions offered byservices, differ significantly. Due to this switching between cloudservices requires writing of separate code for each API. Finally,the main factor of (in)acceptance of cloud storage-based solutions isa question of guaranteeing data safety. Though service providers tellus about encryption used on their side, such encryption is performedon their systems and there's no guarantee that it's really reliableand if it is even performed. So safety of the data is a real problemand not a fantasy of cloud storage opponents. Luckily,there exists a possibility to address all of the above problems in asimple and very cost-effective way. SolidFile System (SolFS) offers the missing pieces that fit well intocloud storage architecture. Asmost file systems, SolFS is page-based. This means that it operatesnot with random sequences of bytes, but with blocks (sectors on thedisk, pages in memory) of fixed size. This makes it easy to backSolFS with almost any storage. Tomake such backing possible SolFS supports callback mode, in which itasks your application to store or retrieve the block to or from theback-end storage. So all you need to do is implement two simplefunctions “put the page #X to the cloud storage” and “retrievethe page #X from the storage” in your code, and that's all – youhave a file system in the cloud! Butthat's not all SolFS can offer. The file system offers severaladvanced features, such as built-in encryption and compression(performed on your side, if you remember the cloud security problemreferenced above), nearly unlimited possibilities for storingmetadata (various supplementary information about the main file ordata), and to perform SQL-like search for files. Moreover, if youneed custom encryption (eg. using keys stored on cryptographichardware tokens), this is possible with two other callbacks –“encrypt page #X” and “decrypt page #X”. Andwhat if you need not a file system, but a relational database? Noproblems either! You can use your favorite DBMS and have it storeit's files on the virtual disk, created by SolFS (System Edition).This way the database files are stored in the cloud storage, and yourapplication works with them via database management system of yourchoice. Onemore benefit of SolFS is that moving from one cloud storage serviceto another is as simple as rewriting two basic functions for storingand retrieving of pages to and from the cloud storage. Youcan say that you still need the code, that works with the cloud. Thisis correct, but it's much easier to write the code that stores andretrieves fixed-sized files (each page has the same size) by pagenumber, than to try to implement a relational database or a filesystem in the cloud yourself. Ifyou don't want to write cloud-specific code at all, we have asolution for you too. It is CloudBlackbox – the components thatprovide uniform access to various cloud storage services. Thesecomponents both provide uniform access to cloud storages (Amazon S3,Microsoft Azure at the moment with more to come) and provide enhancedencryption capabilities, such as certificate-based encryption ofdata. Soif you are moving to the cloud, you don't need to discard establishedparadigms and existing code. Updating them to modern industryofferings is easy and fast.