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August 29, 2015 13:59
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Thinly-provisioned testing.
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| Test Matrix: | |
| Filesystem: ext4 and xfs and scsi_debug for host side, and ext4 or xfs for guest side. | |
| Backend: localfile or iSCSI or libiscsi (Note: BZ#1037503 glusterfs not support discard). | |
| Disk Format: RAW for passthrough, RAW/qcow2 for localfile. | |
| Disk Interface: scsi-block/scsi-hd/ide/ahci for UNMAP mode, scsi-block/scsi-hd interface for WRITE SAME mode. | |
| NOTE: Persistent reservations *cannot* be used with discard when QEMU run as non-root user, but can work well in root user.(BZ966883#c5) | |
| Windows only supports automatic discard (like "-o discard" in Linux). | |
| You can check that discard is enabled by running. | |
| $ fsutil behavior query DisableDeleteNotify | |
| The output should be "DisableDeleteNotify = 0". If it is 1, you can run | |
| $ fsutil behavior set DisableDeleteNotify 0 | |
| to enable discard. |
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