IBM DCS3860, Инструкция по установке, использованию и обслуживанию

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8. Connect one end of a SAS cable to the In (
↑
) SAS connector 1 on the ESM
located in slot B of the earlier/last EXP3800 expansion enclosure and connect
the other end of the SAS cable to the Out (
↓
) SAS connector on the ESM located
in slot B of the EXP3800 expansion enclosure you want to add.
9. Repeat steps 2 on page 47 through 8 to add more EXP3800 expansion
enclosures. You can add up to five expansion enclosures.
Redundant drive channel pair
Each storage controller on the DCS3860 storage system has a drive expansion
channel that contains two x4 SAS ports. The storage expansion enclosures that are
connected to this connector form a drive channel. The maximum number of drives
that can be installed is 360. In DCS3860, one drive channel from each controller
combines to form a redundant drive-channel pair. If any component of the drive
channel fails, the controllers can still access the storage enclosures in the redundant
drive-channel pair.
Lnk Lnk
AC DC
2
1
I
O
AC DC
2
1
I
O
!
ID/Diag
8 8
!
1 2
Lnk Lnk Lnk Lnk
! !
ESM
Lnk Lnk
!
ID/Diag
8 8
!
1 2
Lnk Lnk Lnk Lnk
! !
ESM
!
!
AC DC
2
1
I
O
AC DC
2
1
I
O
Lnk Lnk
AC DC
2
1
I
O
AC DC
2
1
I
O
!
ID/Diag
8 8
!
1 2
Lnk Lnk Lnk Lnk
! !
ESM
Lnk Lnk
!
ID/Diag
8 8
!
1 2
Lnk Lnk Lnk Lnk
! !
ESM
!
!
dcsi0052
Figure 22. Adding enclosures
48
IBM System Storage DCS3860 Storage System: Installation, User's, and Maintenance Guide