第五部分
存储i/o控制
存储i/o介绍(1)
there is a metric,however,that vsphere can use to help determine the utilization of storage.that metric is latency.using latency as the metric to detect contention,vsphere can offer shares(to establish priority when contention occurs)as well as limits (to ensure a vm doesn't consume too many storage resources).the feature that enables this runctionality is called storage i/o control,or sioc.(存储相应限制i/o每秒限制,竞争时可以设置shares)
存储i/o介绍(2)
in order to make this work,sioc has a few requirements you must meet;(使用sioc技术的前提条件)
all datastores that are sloc-enabled have to be under the management of a single vcenter server instance.
sioc is supported on vmfs datastores connected via fibre channel(including fcoe)and iscsi,nfs datastores are also supported.raw device mappings(rdms) are not supported.
datastores must have only a single extent.datastores with multiple extents are not supported.(使用sioc技术前提,所有的sioc都是用同一个vcenter来管理的,特定文件格式vmfs,nfs.rdms不支持,存储的卷只能单一扩展)
配置存储i/o
configuring sioc is two-step process.first,enable sioc on one or more datastores.
配置存储i/o
what values should i use?
for datastores composed of ssds,decrease to 10 ms.
for datastores composed fo 10k/15k fc and sas,leave at 30 ms.
for datastores composed of 7.2k sata/nl-sas,increase to 50 ms.
for auto-tiered datastores with multiple drive types,leave at 30 ms.
激活i/o control
数据存储和数据存储集群-配置-属性
