Cara Pasang Ram Server Lenovo SR650 Rank sparing mode

Rank sparing mode

In rank sparing mode, one rank of a memory module works as the spare rank for the other ranks on the same channel. The spare rank is not available as system memory.

Note:

• All memory modules to be installed must be the same type with the same capacity, frequency, voltage, and ranks.
• If the rank of installed memory modules is one rank, follow the installation rules listed in the following tables. If the rank of installed memory modules is more than one rank, follow the installation rules of independent mode.

The following table shows the memory module population sequence for rank sparing mode when only one processor (Processor 1) is installed.

Table 1. Rank sparing mode with one processor

Total	Processor 1													Total
DIMMs	12	11	10	9	8	7		6	5	4	3	2	1	DIMMs
2								6	5					2
4					8	7		6	5					4
6					8	7		6	5	4	3			6
8			10	9	8	7		6	5	4	3			8
10			10	9	8	7		6	5	4	3	2	1	10
12	12	11	10	9	8	7		6	5	4	3	2	1	12

The following table shows the memory module population sequence for rank sparing mode when two processors (Processor 1 and Processor 2) are installed.

Table 2. Rank sparing mode with two processors

Total	Processor 2														Processor 1													Total
DIMMs	24	23	22	21	20	19		18	17	16	15	14	13		12	11	10	9	8	7		6	5	4	3	2	1	DIMMs
4								18	17													6	5					4
6								18	17										8	7		6	5					6
8					20	19		18	17										8	7		6	5					8
10					20	19		18	17										8	7		6	5	4	3			10
12					20	19		18	17	16	15								8	7		6	5	4	3			12
14					20	19		18	17	16	15						10	9	8	7		6	5	4	3			14
16			22	21	20	19		18	17	16	15						10	9	8	7		6	5	4	3			16
18			22	21	20	19		18	17	16	15						10	9	8	7		6	5	4	3	2	1	18
20			22	21	20	19		18	17	16	15	14	13				10	9	8	7		6	5	4	3	2	1	20
22			22	21	20	19		18	17	16	15	14	13		12	11	10	9	8	7		6	5	4	3	2	1	22
24	24	23	22	21	20	19		18	17	16	15	14	13		12	11	10	9	8	7		6	5	4	3	2	1	24

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