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5th Annual Linux Showcase & Conference — Abstract
Pp. 107-118 of the Proceedings
Design, Implementation and Policy Framework for a Linux Based
Temperature Sensitive Storage
Venkatesh Pallipadi and K. Gopinath, Indian Institute of Science, Bangalore
Abstract
Temperature Sensitive Storage (TSS) is a data stor
age architecture that keeps track ofthe access fre
quencies of data and uses this information to man
age storage e®ciently and e ectively. The term tem
perature refers to the access frequency of the data.
TSS is a hierarchical storage architecture with fre
quently accessed data residing in a storage device
with faster access time, while less frequently ac
cessed data placed in a device which is more storage
e®cient. The hierarchy iscurrently a 3-tier archi
tecture consisting of declustered RAID 1 (RAID1),
RAID 5 (RAID5) and compressed RAID 5 (cRAID5)
storage devices. The data is dynamically moved be
tween these tiers, depending on their access frequen
cies.
TSS, along with fast access and e®ciency of storage,
also provides reliability of data by incorporating re
dundancy in the system through the use of RAID
architecture.
Simple policies for dynamically managing the data
have been implemented as user level daemon pro
cesses. They are independent of the low level im
plementation of the TSS driver. They make useof
certain ioctl() calls provided by the TSS device
driver.
In this paper we discuss the design, implementa
tion and policy framework of a Linux based TSS,
and compare its performance with static RAID sys
tems.
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