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start [2019/08/06 00:07] Dan Williams |
start [2020/06/12 15:58] (current) 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/ | ||
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$ mkfs.xfs -f -m reflink=0 /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 | ||
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/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: | ||
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==== 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: |