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| Both sides previous revision Previous revision Next revision | Previous revision | ||
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start [2019/08/05 16:12] Dan Williams |
start [2020/06/12 15:58] Ira Weiny [Filesystems] |
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| * NDCTL: https://github.com/pmem/ndctl.git | * NDCTL: https://github.com/pmem/ndctl.git | ||
| * NDCTL man pages online: http://pmem.io/ndctl/ | * NDCTL man pages online: http://pmem.io/ndctl/ | ||
| - | * linux-nvdimm Mailing List: https://lists.01.org/mailman/listinfo/linux-nvdimm | + | * linux-nvdimm Mailing List: https://lists.01.org/postorius/lists/linux-nvdimm.lists.01.org |
| * linux-nvdimm Patchwork: https://patchwork.kernel.org/project/linux-nvdimm/list/ | * linux-nvdimm Patchwork: https://patchwork.kernel.org/project/linux-nvdimm/list/ | ||
| Line 429: | Line 429: | ||
| <code> | <code> | ||
| $ mkfs.ext4 -F /dev/pmem0p1 | $ mkfs.ext4 -F /dev/pmem0p1 | ||
| - | $ mkfs.xfs -f /dev/pmem0p2 | + | $ mkfs.xfs -f -m reflink=0 /dev/pmem0p2 |
| $ mkfs.btrfs -f /dev/pmem0p3 | $ mkfs.btrfs -f /dev/pmem0p3 | ||
| - | $ mount -o dax /dev/pmem0p1 /mnt/ext4-pmem0 | + | $ mount [dax_mount_options] /dev/pmem0p1 /mnt/ext4-pmem0 |
| - | $ mount -o dax /dev/pmem0p2 /mnt/xfs-pmem0 | + | $ mount [dax_mount_options] /dev/pmem0p2 /mnt/xfs-pmem0 |
| $ mount /dev/pmem0p3 /mnt/btrfs-pmem0 | $ mount /dev/pmem0p3 /mnt/btrfs-pmem0 | ||
| Line 454: | Line 454: | ||
| /dev/pmem0p3 4.3G 17M 4.1G 1% /mnt/btrfs-pmem0 | /dev/pmem0p3 4.3G 17M 4.1G 1% /mnt/btrfs-pmem0 | ||
| </code> | </code> | ||
| + | |||
| + | Where **[dax_mount_options]** depends on the kernel support you have and the desired behavior. See [[fs_mount_options|fs_mount_options]] for details. | ||
| Check the kernel log to ensure the DAX mount option was honored; mount does not print this information. Example failures: | Check the kernel log to ensure the DAX mount option was honored; mount does not print this information. Example failures: | ||
| Line 481: | Line 483: | ||
| ==== iostats ==== | ==== iostats ==== | ||
| ---- | ---- | ||
| - | iostats are disabled by default due to performance overhead (e.g., 12M IOPS dropping 25% to 9M IOPS). However, they can be enabled in sysfs if desired. | + | iostats are disabled by default due to performance overhead (e.g., 12M IOPS dropping 25% to 9M IOP |
| + | S). However, they can be enabled in sysfs if desired. | ||
| As of kernel 4.5, iostats are only collected for the base pmem device, not per-partition. Also, I/Os that go through DAX paths (rw_page, rw_bytes, and direct_access functions) are not counted, so nothing is collected for: | As of kernel 4.5, iostats are only collected for the base pmem device, not per-partition. Also, I/Os that go through DAX paths (rw_page, rw_bytes, and direct_access functions) are not counted, so nothing is collected for: | ||
start.txt · Last modified: 2020/06/12 15:58 by Ira Weiny
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