Sparse: Difference between revisions
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Related keywords: discard, thin provisioning. | Related keywords: discard, thin provisioning, sparse. | ||
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[[Category | [[Category:Storage]] | ||
Latest revision as of 16:15, 6 October 2023
Related keywords: discard, thin provisioning, sparse.
Links
File systems/storages supporting sparse
Pretty much all filesystems: BTRFS, NILFS, ZFS, NTFS, ext2, ext3, ext4, XFS, JFS, ReiserFS, Reiser4, UFS, Rock Ridge, UDF, ReFS, APFS, F2FS
NFS: since 4.2, make sure to mount as vers=4.2
qcow2
HOWTO
Check sparse file
Compare:
ls -lh myfile du -sh myfile
Or
dd seek=10G if=/dev/zero of=sparsetest bs=1 count=1 status=none du --block-size=1 sparsetest
8192 sparsetest
du --block-size=1 --apparent sparsetest
10737418241 sparsetest
If these outputs are very different, sparse is supported :)
Copy sparse file
rsync -S
