Baseboard Routing Of Sas; Sas/Sata Connector Placement - QUANTA W Mainboard Series S210-MBT2W Technical Manual

A S
BOUT THE ERVER
Key #6 - 8 SCU based SAS/SATA Ports (Yes PSB ROM

#5, No LSI ROM)
Key #7 - 8 SCU based SAS/SATA Ports w/ LSI SW RAID5

added (Yes PSB ROM #5, Yes LSI ROM)
[1.3.86] Still TBD and not currently official POR:
Potential Key #8 version a - 8 SCU based SAS/SATA

Ports w/ XOR enabled and LSI SW RAID5 supported (Yes
PSB ROM #7, Yes LSI ROM)
Potential Key #8 version b - 8 SCU based SAS/SATA

ports w/ XOR enabled and both LSI SW RAID5 and RSTe
SW RAID5 (if adding RSTe SW RAID5 adds no incremen-
tal cost over just the XOR or if RSTe SW RAID5 shows
compelling superior performance over LSI SW RAID5).
(Yes PSB ROM #8, Yes LSI ROM)
Potential Key #9 (only if #8a above is POR and #8b is

NOT POR and RSTe is either "free" with XOR and/or if
RSTe shows significant performance improvement over
LSI SW RAID5) - 8 SCU based SAS/STAT ports w/ XOR
enabled and RSTe SW RAID5 supported. (Yes PSB ROM
#8, No LSI ROM). TBD scenarios are:
#8a only or ...

#8a with #9 or ...

#8b only

New Key#10 that is like Key #5 but w/ RSTe SW RAID5

instead of LSI SW RAID5 (would use PSB ROM#2)
New Key#11 that is like Key #7 but w/ RSTe SW RAID5

instead of LSI SW RAID5 (would use PSB ROM#6)

[1.3.87] Baseboard Routing of SAS

[1.3.88] The SAS 6Gbps interface on the baseboard be routed
using 85 Ohm differential impedance in order to increase the
overall trace length in the baseboard. The 85 Ohm differential
routing is a deviation of the SAS 6Gbps specification which
calls for routing the SAS interface using 100 Ohm differential
impedance. We understand that this trade off allows for
increased routing length between the Patsburg SAS interface
and the baseboard SAS connectors. We also understand that
the rest of the topology will have to meet SAS specification and
utilize SAS cables, connectors, and backplanes that meet 100
Ohm differential impedance. This is a requirement since multi-
ple SAS adapters must be supported on this platform.
[1.3.89] SAS/SATA Connector Place-
ment
[1.3.90] For the S210-MBT2W Server Pedestal Products, there
is a desire from Marketing to support miniSAS (SFF-8087) con-
nectors for the various SAS/SATA ports going to HSBPs (Hot
Swap Backplanes) instead of the standard 7pin connectors.
Since most of the HSBPs are moving to miniSAS (for future
12G support), this would minimize the number of 7pin to SFF-
8087 conversion cables required to be shipped with the system.
In addition, there are potential layout advantages to going with
miniSAS connectors. However, evaluations show that mini-
1-39
S A SCSI / S ATA
ERIAL TTACHED ERIAL