KEYWORDS: Interfaces, Computer security, Detection and tracking algorithms, Data storage, Computer architecture, Data modeling, Optoelectronics, Current controlled current source, Analytical research, Transparent conductors
Traditional RAID gradually becomes unable to satisfy most applications. It is reflected in two main
respects, one is the security problem of data in RAID system, the other is that one RAID controller can not use several
devices of different protocol. Now, the performance of RAID controller gets faster and faster, therefore, it is the right
time to use software encryption module instead of hardware encryption to guarantee the data confidentiality.
Furthermore, with the development of storage device, different disk interface appears. How to use the disk of different
protocol in the same RAID controller is becoming a new research hotspot. As to the problems mentioned above, this
paper presents a new multi-protocol disk array architecture that provides encryption on RAID, referred to as Encryption
Multi-protocol RAID (EMRAID). EMRAID solution not only uses different interface to management the different kinds
of device, but also adopts SEAL algorithm which is an efficient pseudorandom function family encryption algorithm.
Analysis result indicates that EMRAID performs more efficiently than the single-protocol RAID, and the experiment
shows that the encryption algorithm has certain loss (not very large) on I/O performance.
With the networked storage becomes a tendency of data storing, the data stored on storage device gradually
becomes the major goal of the malicious attackers, and the storage system becomes the final defense line to safeguard
data security. To strengthen the confidentiality of data, this paper designed a new cryptographic read/write flow for
networked storage system. On the base of the optimized data read/write flow, we implemented a Kernel-based
Cryptographic File System (short for KCFS). The cryptographic file system can overcome the inconvenience of encryption application and the low efficiency of user-level encryption file system, e.g CFS, so as to realize the encryption/decryption function at the kernel-level file system, providing the upper-level application a transparent storage
space. Additionally, the data is stored in cipher-text mode, so can protect the stored data from illegal exposure. In the
comparative experiment, the transferring rate of NFS+KCFS reduces between 9.2% and 13.2% relative to NFS, and the transferring rate of NFS+CFS reduces between 18.6% and 30.1%. The experiment shows that KCFS can reach better read/write performance compared to user-level encryption file system.
In this paper, we investigate the reliability in a petabyte scale storage system built from thousands of Object-Based
Storage Devices and study the mechanisms to protect data loss when disk failure happens. We delve in two underlying
redundancy mechanisms: 2-way mirroring, 3-way mirroring. To accelerate data reconstruction, Fast Mirroring Copy is
employed where the reconstructed objects are stored on different OBSDs throughout the system. A SMART reliability
for enhancing the reliability in very large-scale storage system is proposed. Results show that our SMART Reliability
Mechanism can utilize the spare resources (including processing, network, and storage resources) to improve the
reliability in very large storage systems.
KEYWORDS: Computing systems, Data storage, Optoelectronics, Computer science, Multimedia, Optical storage, Gallium nitride, Current controlled current source, Windows 2000, Basic research
The distribution of metadata is very important in mass storage system. Many storage systems use subtree partition or
hash algorithm to distribute the metadata among metadata server cluster. Although the system access performance is
improved, the scalability problem is remarkable in most of these algorithms. This paper proposes a new directory hash
(DH) algorithm. It treats directory as hash key value, implements a concentrated storage of metadata, and take a dynamic
load balance strategy. It improves the efficiency of metadata distribution and access in mass storage system by hashing
to directory and placing metadata together with directory granularity. DH algorithm has solved the scalable problems
existing in file hash algorithm such as changing directory name or permission, adding or removing MDS from the
cluster, and so on. DH algorithm reduces the additional request amount and the scale of each data migration in scalable
operations. It enhances the scalability of mass storage system remarkably.
With the rapid development of massive storages, traditional RAID of single-protocol is increasingly unable to satisfy the
various demands of users. For the purpose of keeping down the investment of storages, we propose a multi-protocol
RAID that utilizes existing storage devices. The multi-protocol RAID achieves the integration of storage via managing
the disks of different interfaces. This paper presents a framework of multi-protocol RAID and a prototype
implementation of it, i.e., the proposed multi-protocol approach can not only unify the storage devices of different types,
but also provide different access channels (e.g. iSCSI, FC) to manage the heterogeneous RAID system, thus achieving
the goal of centralized management. Our function tests validate the feasibility and flexibility of the proposed RAID
system. The comparison tests indicate that the multi-protocol RAID can attain even higher performance than that of the
single-protocol RAID, especially the aggregated bandwidth.
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