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When we delete a snapshot, we consolidate some bpobj's together because we no longer need to keep their entries in separate buckets. This is done in constant time by including the "sub" bpobj by reference in the parent bpobj. After many snapshots have been deleted, we may have many sub-bpobj's. Usually, most sub-bpobj's don't contain many BP's. Compared to this small payload, the sub-bpobj is relatively heavyweight since it is a object in the MOS. A common scenario on a long-lived pool is for the vast majority of MOS objects to be small sub-bpobj's. To improve this situation, when consolidating bpobj's together, bpobj_enqueue_subobj() can copy the contents of small bpobj's into the parent, and then delete the enqueued bpobj, rather than including it by reference. Since this copying is limited in size (to one block), the consolidation is still constant time, though with a larger constant due to reading in the one block of the enqueued bpobj. This idea and mechanism are similar to how we handle "sub-subobj's". When including a sub-bpobj by reference, if the sub-bpobj itself has less than a block of sub-sub-bpobj's, the list of sub-sub-bpobj's is copied to the parent bpobj's list of sub-bpobj's. Reviewed-by: Serapheim Dimitropoulos <serapheim@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Paul Zuchowski <pzuchowski@datto.com> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Closes #8053 Issue #7908 |
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ZFS on Linux is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community.
Official Resources
Installation
Full documentation for installing ZoL on your favorite Linux distribution can be found at our site.
Contribute & Develop
We have a separate document with contribution guidelines.
Release
ZFS on Linux is released under a CDDL license.
For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197
Supported Kernels
- The
METAfile contains the officially recognized supported kernel versions.