内存 DR 示例

# ldm list
NAME             STATE      FLAGS   CONS    VCPU  MEMORY   UTIL  UPTIME
primary          active     -n-cv-  SP      4     27392M   0.4%  1d 22h 53m
ldom1            active     -n----  5000    2     2G       0.4%  1d 1h 23m
ldom2            bound      ------  5001    2     200M

以下 ldm add-mem 命令将退出并显示错误，因为您必须将内存指定为 256 MB 的倍数。下一个 ldm add-mem 命令使用 –-auto-adj 选项，这样，即使您将 200M 指定为要添加的内存量，系统也会将内存量舍入为 256 MB。

# ldm add-mem 200M ldom1
The size of memory must be a multiple of 256MB.

# ldm add-mem --auto-adj 200M ldom1
Adjusting request size to 256M.
The ldom1 domain has been allocated 56M more memory
than requested because of memory alignment constraints.

# ldm list
NAME            STATE   FLAGS   CONS    VCPU    MEMORY  UTIL    UPTIME
primary         active  -n-cv-  SP      4       27392M  5.0%    8m
ldom1           active  -n----  5000    2       2304M   0.5%    1m
ldom2           bound   ------  5001    2       200M

ldm rm-mem 命令将退出并显示错误，因为您必须将内存指定为 256 MB 的倍数。将 –-auto-adj 选项添加到同一命令后，内存删除将成功，因为内存量会向下舍入到邻近的 256 MB 边界。

# ldm rm-mem --auto-adj 300M ldom1
Adjusting requested size to 256M.
The ldom1 domain has been allocated 44M more memory
than requested because of memory alignment constraints.

# ldm list
NAME            STATE   FLAGS   CONS    VCPU    MEMORY  UTIL    UPTIME
primary         active  -n-cv-  SP      4       27392M  0.3%    8m
ldom1           active  -n----  5000    2       2G      0.2%    2m
ldom2           bound   ------  5001    2       200M

示例 10-8 绑定域上的内存 DR 操作

本示例说明如何向绑定域 ldom2 添加内存和从中删除内存。

ldm list 的输出显示了 Memory (内存) 字段中各个域的内存。第一个 ldm add-mem 命令可向 ldom2 域中添加 100 MB 的内存。下一个 ldm add-mem 命令中指定了 –-auto-adj 选项，这可导致将额外的 112 MB 内存动态添加到 ldom2 中。

ldm rm-mem 命令可从 ldom2 域中动态删除 100 MB 的内存。如果在同一命令中指定 –-auto-adj 选项以删除 300 MB 内存，内存量将向下舍入到邻近的 256 MB 边界。

# ldm list
NAME             STATE      FLAGS   CONS    VCPU  MEMORY   UTIL  UPTIME
primary          active     -n-cv-  SP      4     27392M   0.4%  1d 22h 53m
ldom1            active     -n----  5000    2     2G       0.4%  1d 1h 23m
ldom2            bound      ------  5001    2     200M          

# ldm add-mem 100M ldom2

# ldm list
NAME             STATE      FLAGS   CONS    VCPU  MEMORY   UTIL  UPTIME
primary          active     -n-cv-  SP      4     27392M   0.5%  1d 22h 54m
ldom1            active     -n----  5000    2     2G       0.2%  1d 1h 25m
ldom2            bound      ------  5001    2     300M       

# ldm add-mem --auto-adj 100M ldom2
Adjusting request size to 256M.
The ldom2 domain has been allocated 112M more memory
than requested because of memory alignment constraints.

# ldm list
NAME             STATE      FLAGS   CONS    VCPU  MEMORY   UTIL  UPTIME
primary          active     -n-cv-  SP      4     27392M   0.4%  1d 22h 55m
ldom1            active     -n----  5000    2     2G       0.5%  1d 1h 25m
ldom2            bound      ------  5001    2     512M          

# ldm rm-mem 100M ldom2
# ldm list
NAME             STATE      FLAGS   CONS    VCPU  MEMORY   UTIL  UPTIME
primary          active     -n-cv-  SP      4     27392M   3.3%  1d 22h 55m
ldom1            active     -n----  5000    2     2G       0.2%  1d 1h 25m
ldom2            bound      ------  5001    2     412M          

# ldm rm-mem --auto-adj 300M ldom2
Adjusting request size to 256M.
The ldom2 domain has been allocated 144M more memory
than requested because of memory alignment constraints.

# ldm list
NAME             STATE      FLAGS   CONS    VCPU  MEMORY   UTIL  UPTIME
primary          active     -n-cv-  SP      4     27392M   0.5%  1d 22h 55m
ldom1            active     -n----  5000    2     2G       0.2%  1d 1h 26m
ldom2            bound      ------  5001    2     256M

示例 10-9 设置域内存大小

本示例说明如何使用 ldm set-memory 命令向域中添加内存和从中删除内存。

ldm list 的输出显示了 Memory (内存) 字段中各个域的内存。

# ldm list
NAME             STATE      FLAGS   CONS    VCPU  MEMORY   UTIL  UPTIME
primary          active     -n-cv-  SP      4     27392M   0.5%  1d 22h 55m
ldom1            active     -n----  5000    2     2G       0.2%  1d 1h 26m
ldom2            bound      ------  5001    2     256M

以下 ldm set-mem 命令会尝试将 primary 域的大小设置为 3400 MB。最终错误表明指定的值不在 256 MB 边界上。将 –-auto-adj 选项添加到同一命令后，可以成功删除某些内存并保持在 256 MB 边界上。此命令还会发出警告，以指出并非所有请求的内存都可以删除，因为域可能正在使用某些内存。

# ldm set-mem 3400M primary
An ldm set-mem 3400M command would remove 23992MB, which is not a multiple
of 256MB. Instead, run ldm rm-mem 23808MB to ensure a 256MB alignment.

# ldm set-mem --auto-adj 3400M primary
Adjusting request size to 3.4G.
The primary domain has been allocated 184M more memory
than requested because of memory alignment constraints.
Only 9472M of memory could be removed from the primary domain
because the rest of the memory is in use.

下一个 ldm set-mem 命令会将处于绑定状态的 ldom2 域的内存大小设置为 690 MB。如果向同一命令中添加 –-auto-adj 选项，将动态向 ldom2 中添加额外的 78 MB 内存以保持在 256 MB 边界上。

# ldm set-mem 690M ldom2
# ldm list
NAME             STATE      FLAGS   CONS    VCPU  MEMORY   UTIL  UPTIME
primary          active     -n-cv-  SP      4     17920M   0.5%  1d 22h 56m
ldom1            active     -n----  5000    2     2G       0.6%  1d 1h 27m
ldom2            bound      ------  5001    2     690M          

# ldm set-mem --auto-adj 690M ldom2
Adjusting request size to 256M.
The ldom2 domain has been allocated 78M more memory
than requested because of memory alignment constraints.

# ldm list
NAME             STATE      FLAGS   CONS    VCPU  MEMORY   UTIL  UPTIME
primary          active     -n-cv-  SP      4     17920M   2.1%  1d 22h 57m
ldom1            active     -n----  5000    2     2G       0.2%  1d 1h 27m
ldom2            bound      ------  5001    2     768M

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