22 Chapter
2
Subsystem Architecture and Components
Table 2.3
Disk Drive Specifications
Disk Drive Type
Parameter
73 GB
47 GB
18 GB
146 GB
180 GB*
Formatted
capacity
(GB)
72.91 47.19 18.46 143.7 172.55
Platter diameter
3 inches
3 inches
3 inches
3 inches
3 inches
Physical
cylinders
(user
area)
15,154 12,027 12,027 n/a
24,247
Physical tracks per physical cylinder
(number of heads)
24 (DKR1C)
10 (DKR2D)
23 (DKR1B)
16 (DKR1C)
9 (DKR2B)
6 (DKR2C)
10 24
Physical disk platters (user area)
(numbers of disks)
12 (DKR1C)
5 (DKR2D)
12 (DKR1B)
8 (DKR1C)
5 (DKR2B)
3 (DKR2C)
5 12
Sector
length
(byte)
520(512) 520(512) 520(512) 520
(512) 520(512)
Seek
time
(ms) MIN.
0.5/0.7 0.5/0.7 0.5/0.7 0.5/0.7 0.8
/
1.1
(Read/Write)
MAX.
12.0/13.0 12.0/13.0 12.0/13.0 10.0/11.0 16.0
/
17.0
AVE.
5.7/6.5 5.7/6.5 5.2/6.0 4.9/5.4 7.4
/
8.2
Revolution
speed
(rpm)
10,025 10,025 10,025 10,025 7,200
Average
latency
time
(ms)
2.99 2.99 2.99 2.99 4.17
Internal data transfer rate (MB/sec)
33.6 to 56.6 30.2 to 45.6 30.2 to 45.6 57.3 to 99.9 35.3 to 63.5
Max. interface data transfer rate
(MB/sec)
100 100 100 100 100
*
Caution and notes for the 180-GB HDDs:
Caution:
The 180-GB HDDs should not be intermixed with other HDD types in the same
array domain (behind the same ACP pair). If 180-GB HDDs are used, all HDDs in that
array domain should also be 180-GB HDDs.
Note:
Subsystems which contain the 180-GB HDDs do not have the same availability or
serviceability as those subsystems which do not contain 180-GB HDDs. Some offline
maintenance may be required.
Note:
The 180-GB HDDs are intended for archival use and do not have characteristics
that make them suitable as performance devices.
Содержание 9900 Series
Страница 1: ...Hitachi Freedom Storage Lightning 9900 User and Reference Guide ...
Страница 2: ......
Страница 6: ...vi Preface ...
Страница 14: ...xiv Contents ...
Страница 42: ...28 Chapter 2 Subsystem Architecture and Components ...
Страница 132: ...118 Chapter 6 Troubleshooting ...
Страница 134: ...120 Appendix A Unit Conversions ...