D. Santry, M. Feeley, N. Hutchinson, A. Veitch, R. Carton, and J. O r. Deciding when to forget in the Elephant le system. In Proc. of ACM SOSP, December 1999.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....recent work by Yu and Vahdat [38] These distributed le systems may retain periodic checkpoints of previous system state, but they do not retain versions of individual les at a ne granularity, nor do they provide a simple interface to automatically retrieve these versions. OceanStore, like EFS [30], does keep all (or most) versions of les. Our system was designed to make time travel in OceanStore as simple as that in EFS. 2.2 Databases Although less related to OceanStore super cially, replicated database management systems (DBMSs) have developed many of the same ideas. Franklin et al. ....

D. Santry, M. Feeley, N. Hutchinson, A. Veitch, R. Carton, and J. O r. Deciding when to forget in the Elephant le system. In Proc. of ACM SOSP, December 1999.

....devices internally version all data and audit all requests for a guaranteed amount of time (e.g. a week) thus providing system administrators time to detect and recover from intrusions. The critical di erence between self securing storage and host controlled versioning (e.g. Elephant [29]) is that intruders can no longer bypass the versioning software by compromising a complex OS or its poorly protected user accounts. Instead, intruders must compromise single purpose devices that export only a simple storage interface, and in some con gurations, they may have to 1 compromise ....

....client to specify what is important to keep. Fortunately, disk capacities increase faster than most computer characteristics (100 per annum in recent years) Analysis of recent workload studies suggests that it is possible to version all data on modern 30 100GB drives for far longer than a week [29, 35]. Further, aggressive compression and cross version di erencing techniques extend the intrusion detection window o ered by self securing storage devices. Other challenges include maintaining on disk locality when blocks cannot be overwritten, achieving secure administrative control, and dealing ....

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Douglas S. Santry, Michael J. Feeley, Norman C. Hutchinson, Ross W. Carton, Jacob O r, and Alistair C. Veitch. Deciding when to forget in the Elephant le system. ACM Symposium on Operating System Principles (Kiawah Island Resort, South Carolina). Published as Operating Systems Review, 33(5):110-123. ACM, 12-15 December 1999.

....devices internally version all data and audit all requests for a guaranteed amount of time (e.g. a week) thus providing system administrators time to detect and recover from intrusions. The critical di erence between self securing storage and host controlled versioning (e.g. Elephant [18] or Adaptec s GoBack [4] is that intruders can no longer bypass the versioning software by compromising a complex OS or its poorly protected user accounts. Instead, intruders must compromise single purpose devices that export only a simple storage interface, and in some con gurations, they may ....

....client to specify what is important to keep. Fortunately, disk capacities increase faster than most computer characteristics (100 per annum in recent years) Analysis of recent workload studies suggests that it is possible to version all data on modern 30 100 GB drives for far longer than a week [18, 21]. Other challenges include achieving secure administrative control and dealing with denial of service attacks. The remainder of this paper is organized as follows. Section 2 discusses intrusion survival and recovery diculties in greater detail. Section 3 describes how self securing storage ....

[Article contains additional citation context not shown here]

Douglas S. Santry, Michael J. Feeley, Norman C. Hutchinson, Ross W. Carton, Jacob Or, and Alistair C. Veitch. Deciding when to forget in the Elephant le system. ACM Symposium on Operating System Principles (Kiawah Island Resort, South Carolina). Published as Operating Systems Review, 33(5):110-123. ACM, 12-15 December 1999.

....a month) thus providing system administrators time to detect intrusions. For intrusions detected within this window, all of the version and audit information is available for analysis and recovery. The critical di erence between self securing storage and host controlled versioning (e.g. Elephant [29]) is that intruders can no longer bypass the versioning software by compromising complex OSes or their poorly protected user accounts. Instead, intruders must compromise singlepurpose devices that export only a simple storage interface, and in some con gurations, they may have to compromise both. ....

....keep all versions of all data for an extended period of time, and it is not acceptable to trust the client to specify what is important to keep. Fortunately, storage densities increase faster than most computer characteristics (100 per annum in recent years) Analysis of recent workload studies [29, 34] suggests that it is possible to ver sion all data on modern 30 100GB drives for several weeks. Further, aggressive compression and crossversion di erencing techniques can extend the intrusion detection window o ered by self securing storage devices. Other challenges include eciently encoding the ....

[Article contains additional citation context not shown here]

Douglas S. Santry, Michael J. Feeley, Norman C. Hutchinson, Ross W. Carton, Jacob Or, and Alistair C. Veitch. Deciding when to forget in the Elephant le system. ACM Symposium on Operating System Principles (Kiawah Island Resort, South Carolina). Published as Operating Systems Review, 33(5):110-123. ACM, 12-15 December 1999.

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