StatefulSet部署时PVC创建失败，需支持副本因子1的卷创建

部署关联PVC的StatefulSet时，卷创建失败。

事件报错 #

9s          Warning   ProvisioningFailed   persistentvolumeclaim/kafka-vol-kafka-0                     Failed to provision volume with StorageClass "hello-sc": rpc error: code = Internal desc = Failed to create volume: This IO profile requires a minimum replication factor of 2 nodes

当前PVC状态 #

kubectl get pvc -n hello
NAME                STATUS    VOLUME   CAPACITY   ACCESS MODES   STORAGECLASS   AGE
hello-vol-hello-0     Pending                                      hell-sc     44m

存储类配置 #

Name:            hello-sc
IsDefaultClass:  Yes
Annotations:     kubectl.kubernetes.io/last-applied-configuration={"allowVolumeExpansion":true,"apiVersion":"storage.k8s.io/v1","kind":"StorageClass","metadata":{"annotations":{"storageclass.kubernetes.io/is-default-class":"true"},"name":"hello-sc"},"parameters":{"cow_ondemand":"true","disable_io_profile_protection":"true","fs":"ext4","io_profile":"db_remote","priority_io":"high","repl":"1"},"provisioner":"kubernetes.io/portworx-volume","reclaimPolicy":"Delete","volumeBindingMode":"Immediate"}
,storageclass.kubernetes.io/is-default-class=true
Provisioner:           kubernetes.io/portworx-volume
Parameters:            cow_ondemand=true,disable_io_profile_protection=true,fs=ext4,io_profile=db_remote,priority_io=high,repl=1
AllowVolumeExpansion:  True
MountOptions:          <none>
ReclaimPolicy:         Delete
VolumeBindingMode:     Immediate
Events:                <none>

需求 #

部署带PVC的StatefulSet时，要求设置副本因子（repl）为1也能成功创建卷。

问题根因 #

错误信息明确指出，当前使用的io_profile=db_remote要求最小复制因子为2，但存储类中设置了repl=1。虽然配置了disable_io_profile_protection=true，但该参数可能未生效或Portworx版本不支持绕过此限制。

解决步骤 #

方案1：更换兼容单副本的IO Profile

将io_profile改为支持单副本的类型（如db或default），修改存储类参数：

parameters:
  cow_ondemand: "true"
  fs: "ext4"
  io_profile: "db"  # 替换为兼容单副本的profile
  priority_io: "high"
  repl: "1"

方案2：确保disable_io_profile_protection参数生效

1. 确认Portworx版本支持该参数，若版本过低则升级Portworx。
2. 检查参数值是否为字符串格式"true"（而非布尔值），重新编辑存储类：

   kubectl edit storageclass hello-sc
   

后续操作

修改存储类后，删除处于Pending状态的PVC，让StatefulSet重新触发卷创建：

kubectl delete pvc hello-vol-hello-0 -n hello

等待片刻后检查PVC状态：

kubectl get pvc -n hello

内容的提问来源于stack exchange，提问作者Janardhan