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Digital Media Storage Solution Installation Guide 7
© Copyright 2010, IBM Corporation. All rights reserved.
SAN Architecture must meet RPQ criteria
• Limit number of paths for Xsan/StorNext clients to four
• This is to limit both complexity and the amount of time required to initialize clients
on the SAN
• Redundant Meshed Fibre Channel SAN (cross-connected)
• RDAC MPP supports this configuration
• Some IBM documentation may seem to preclude this, but those documents are
based on an old non-“mpp” version of RDAC
• Limits cause for failover to Controller failure
• Specific Firmware, software, and Operating System Levels
IBM Storage
• DS5100/DS5300
• DS5020
• DS4700
• DS3400
• Future
DS3400
DS4700
DS5020
DS5100
base
performance
DS5300
enhanced
performance
Burst I/O rate
cache reads
(IOPS)
110,000
120,000
200,000
650,000
700,000
Sustained I/O rate
disk reads
21,000
39,250
50,000
76,000
170,000
Sustained I/O rate
disk writes
4,500
9,350
9,500
20,000
38,000
Drives
48 SAS/SATA
112 FC/SATA
112
FC/SATA/FDE
256
FC/SATA/FDE
448
FC/SATA/FDE
/SSD*
(480) SATA*
Burst throughput
cache read
1,600
1,550MB/s
3,700 MB/s
1,600MB/s
6,400 MB/s
Sustained
throughput
disk read
925
980MB/s
1,600 MB/s
1,600MB/s
6,400 MB/s
Sustained
throughput
disk write
720
850 MB/s
1,400 MB/s
1,300 MB/s
5,300 MB/s
Host ports
4
4
4
8
16