TY - CONF
T1 - Observing the effects of multi-zone disks
AU - van Meter, Rodney
N1 - Funding Information:
This research was sponsored by the Advanced Research Projects Agency under Contract No. DABT63-93-C-0062. Views and conclusions contained in this report are the authors' and should not be interpreted as representing the official opinion or policies, either expressed or implied, of ARPA, the U.S. Government, or any person or agency connected with them.
Publisher Copyright:
© 1997 by The USENIX Association. All Rights Reserved.
PY - 1997
Y1 - 1997
N2 - Current generations of hard disk drives use a technique known as zoned constant angular velocity (ZCAV), taking advantage of the geometry to increase total disk capacity by varying the number of disk sectors per track with the distance from the spindle. A side effect of this is that the transfer rate also varies with sector address. We analytically estimated and measured this effect on file system performance on a BSD Fast File System, showing a drop of roughly 25% in peak transfer rate depending on head position. We also show that, while ZCAV effects cannot be ignored, a simple linear model adequately estimates the performance from the few parameters normally available in disk drive spec sheets.
AB - Current generations of hard disk drives use a technique known as zoned constant angular velocity (ZCAV), taking advantage of the geometry to increase total disk capacity by varying the number of disk sectors per track with the distance from the spindle. A side effect of this is that the transfer rate also varies with sector address. We analytically estimated and measured this effect on file system performance on a BSD Fast File System, showing a drop of roughly 25% in peak transfer rate depending on head position. We also show that, while ZCAV effects cannot be ignored, a simple linear model adequately estimates the performance from the few parameters normally available in disk drive spec sheets.
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M3 - Paper
AN - SCOPUS:85084162117
T2 - USENIX 1997 Annual Technical Conference
Y2 - 6 January 1997 through 10 January 1997
ER -