Disk Units; Disk Storage Specifications Comparison - IBM i series Handbook

Internal Magnetic Media
Notes:
1. Like lettered disks can be part of the same RAID array, and like numbered disks can mirror each other.
2. Single-byte disks cannot be placed into slots K8 through K16. In the case of the #5055 System Expansion
Unit, single-byte disks cannot be placed into any slots.
3. Not Ultra-SCSI or Ultra2 SCSI when attached to this storage expansion unit.
4. If not coming from a suppor ted upgrade path, order RPQ 843977 for the hardware to mount one disk unit
from one server to another server.
N Available as a new disk.
S Supported but not orderable.
X Available as a migrated disk.

Disk Units

This section outlines a comparison of disk storage specifications and provides descriptions
for disk units supported on the iSeries server.

Disk Storage Specifications Comparison

This table shows the specifications of the current and legacy IBM internal disk technologies
supported on the iSeries servers.
Disk Disk
Capacity
Type Diameter
#4308 3.5"
#4314 3.5"
#4317 3.5"
#4318 3.5" 17.54 GB
#4319 3.5" 35.16 GB
#4324 3.5" 17.54 GB
#6605 3.5" 1.031 GB
#6606 3.5" 1.967 GB
#6607 3.5"
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iSeries Handbook
Avg.
Average
Seek
Latency
Time
R 6.5 ms
4.19 GB 4.17 ms
W 8.0 ms
R 6.5 ms
8.58 GB 4.17 ms
W 7.5 ms
R 5.3 ms
8.58 GB 2.99 ms
W 6.3 ms
R 4.9 ms
2.99 ms
W 5.9 ms
R 4.9 ms
3.00 ms
W 5.9 ms
R 7.0 ms
4.17 ms
W 8.0 ms
7.8 ms 4.17 ms
7.8 ms 4.17 ms
4.19 GB 8.3 ms 4.17 ms
Data- Areal
RPM Rate Density
(Burst) (M/inch)
1109 to
7200 40 MB/s
1253
1109 to
7200 40 MB/s
1253
1353 to
10 K 80 MB/s
2024
3197 to
10 K 80 MB/s
3535
10 K 80 MB/s 7040
7200 40 MB/s 3025
7200 20 MB/s 562
7200 20 MB/s 532
7200 20 MB/s 829
Read
Ahead
Cache
1 MB
1 MB
4 MB
2 MB
3.58 MB
1.79 MB
512 KB
512 KB
512 KB