Red Hat Summit Red Hat Summit지원콘솔개발자평가판 시작연락처

10장. Reclaiming space on target volumes

The deleted files or chunks of zero data sometimes take up storage space on the Ceph cluster resulting in inaccurate reporting of the available storage space. The reclaim space operation removes such discrepancies by executing the following operations on the target volume:

  • fstrim - This operation is used on volumes that are in Filesystem mode and only if the volume is mounted to a pod at the time of execution of reclaim space operation.
  • rbd sparsify - This operation is used when the volume is not attached to any pods and reclaims the space occupied by chunks of 4M-sized zeroed data.
참고
  • Only the Ceph RBD volumes support the reclaim space operation.
  • The reclaim space operation involves a performance penalty when it is being executed.

You can use one of the following methods to reclaim the space:

10.1. Enabling reclaim space operation by annotating PersistentVolumeClaims
링크 복사

Use this procedure to automatically invoke the reclaim space operation to annotate persistent volume claim (PVC) based on a given schedule.

참고
  • The schedule value is in the same format as the Kubernetes CronJobs which sets the and/or interval of the recurring operation request.
  • Recommended schedule interval is @weekly. If the schedule interval value is empty or in an invalid format, then the default schedule value is set to @weekly. Do not schedule multiple ReclaimSpace operations @weekly or at the same time.
  • Minimum supported interval between each scheduled operation is at least 24 hours. For example, @daily (At 00:00 every day) or 0 3 * * * (At 3:00 every day).
  • Schedule the ReclaimSpace operation during off-peak, maintenance window, or the interval when the workload input/output is expected to be low.
  • ReclaimSpaceCronJob is recreated when the schedule is modified. It is automatically deleted when the annotation is removed.

Procedure

  1. Get the PVC details. 

    $ oc get pvc data-pvc
     
    NAME      STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS                          AGE
data-pvc  Bound    pvc-f37b8582-4b04-4676-88dd-e1b95c6abf74   1Gi        RWO            ocs-storagecluster-ceph-rbd           20h

  2. Add annotation reclaimspace.csiaddons.openshift.io/schedule=@monthly to the PVC to create reclaimspacecronjob. 

    $ oc annotate pvc data-pvc "reclaimspace.csiaddons.openshift.io/schedule=@monthly"
     
    persistentvolumeclaim/data-pvc annotated

  3. Verify that reclaimspacecronjob is created in the format, "<pvc-name>-xxxxxxx". 

    $ oc get reclaimspacecronjobs.csiaddons.openshift.io
     
    NAME                    SCHEDULE    SUSPEND   ACTIVE   LASTSCHEDULE   AGE
data-pvc-1642663516     @monthly                                      3s

  4. Modify the schedule to run this job automatically. 

    $ oc annotate pvc data-pvc "reclaimspace.csiaddons.openshift.io/schedule=@weekly" --overwrite=true
     
    persistentvolumeclaim/data-pvc annotated

  5. Verify that the schedule for reclaimspacecronjob has been modified. 

    $ oc get reclaimspacecronjobs.csiaddons.openshift.io
     
    NAME                  SCHEDULE    SUSPEND   ACTIVE   LASTSCHEDULE   AGE
data-pvc-1642664617   @weekly                                       3s
Red Hat logoGithubredditYoutubeTwitter

자세한 정보

평가판, 구매 및 판매

커뮤니티

Red Hat 소개

Red Hat은 기업이 핵심 데이터 센터에서 네트워크 에지에 이르기까지 플랫폼과 환경 전반에서 더 쉽게 작업할 수 있도록 강화된 솔루션을 제공합니다.

보다 포괄적 수용을 위한 오픈 소스 용어 교체

Red Hat은 코드, 문서, 웹 속성에서 문제가 있는 언어를 교체하기 위해 최선을 다하고 있습니다. 자세한 내용은 다음을 참조하세요.Red Hat 블로그.

Red Hat 문서 정보

Red Hat을 사용하는 고객은 신뢰할 수 있는 콘텐츠가 포함된 제품과 서비스를 통해 혁신하고 목표를 달성할 수 있습니다. 최신 업데이트를 확인하세요.

Legal Notice

Theme

© 2026 Red Hat맨 위로 이동