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Freenix 2000 USENIX Annual Technical Conference Paper
[Technical Index]
Next: Introduction
A 3-tier RAID Storage System with RAID1, RAID5 and compressed RAID5 for Linux1K. Gopinath Nitin Muppalaneni N. Suresh Kumar Pankaj Risbood
Abstract:
This paper presents the design and implementation of a host-based
driver (a ``volume manager'') for a 3-tier RAID storage system,
currently with 3 tiers: a small RAID1 tier and
larger RAID5 and compressed RAID5 (cRAID5) tiers.
Based on access patterns (``temperature''), the driver automatically
migrates frequently accessed data to RAID1 while demoting not so
frequently accessed data to RAID5/cRAID5.
The prototype system, called ``Temperature Sensitive Storage'' (TSS), provides reliable persistence semantics for data
migration between the tiers using ordered updates or logging. Mechanisms are
separated from policies through an API so that any desired policy can
be implemented in trusted user processes. We also discuss the problems faced while
moving from the original implementation on the Solaris platform to Linux. Finally, we present comparison of the
performance of our design with comparable systems using striping or RAID5.
Next: Introduction Dr K Gopinath 2000-04-25 |
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This paper was originally published in the
Proceedings of the Freenix 2000 USENIX Annual Technical Conference,
June 18-23, 2000, San Diego, California, USA
Last changed: 7 Feb 2002 ml |
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