Does this mean the space is allocated, but actually empty so can let’s say overwrite? Istvan Szabo Senior Infrastructure Engineer --------------------------------------------------- Agoda Services Co., Ltd. e: istvan.szabo@xxxxxxxxx<mailto:istvan.szabo@xxxxxxxxx> --------------------------------------------------- On 2021. Jan 28., at 19:51, Burkhard Linke <Burkhard.Linke@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote: Email received from outside the company. If in doubt don't click links nor open attachments! ________________________________ Hi, On 28.01.21 13:21, Szabo, Istvan (Agoda) wrote: I mean the image hasn’t been deleted, but the content from the image. RBD is (as the name implies) is a block device layer. Block devices do not have a concept of content, file, directories or even allocated or unallocated space. They are just continuous byte streams with a certain size. The _filesystem_ on top of the block device implements these concepts, and also tracks free / unallocated space. And a filesystem is able to inform the block layer about allocations using TRIM and DISCARD calls (e.g. tools like fstrim or corresponding mount options). RBD usually supports trim operation in recent kernels (krbd) or with certain configuration options (librbd) Regards, Burkhard _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx ________________________________ This message is confidential and is for the sole use of the intended recipient(s). It may also be privileged or otherwise protected by copyright or other legal rules. If you have received it by mistake please let us know by reply email and delete it from your system. It is prohibited to copy this message or disclose its content to anyone. Any confidentiality or privilege is not waived or lost by any mistaken delivery or unauthorized disclosure of the message. All messages sent to and from Agoda may be monitored to ensure compliance with company policies, to protect the company's interests and to remove potential malware. Electronic messages may be intercepted, amended, lost or deleted, or contain viruses. _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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