Hi Joel, Yes, I can mount with "-o dax":
lvcreate -L 40G -n test-lv vg_ssd scan_dev_close /dev/sdb2 no DEV_IN_BCACHE set Logical volume "test-lv" created. mkfs.ext4 -b 4K /dev/vg_ssd/test-lv mount -o dax /dev/vg_ssd/test-lv /mnt df /mnt Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/vg_ssd-test--lv 41022688 49176 38859976 1% /mnt But it shows a failure in syslog:[518270.833954] EXT4-fs (dm-16): DAX enabled. Warning: EXPERIMENTAL, use at your own risk [518270.833959] EXT4-fs (dm-16): DAX unsupported by block device. Turning off DAX. [518270.835599] EXT4-fs (dm-16): mounted filesystem with ordered data mode. Opts: dax
Regards, Rob On 6/11/19 3:57 PM, Joel Colledge wrote:
Hi Rob, This is strange. It seems that your LV is reporting that it supports PMEM/DAX. I suggest that you check that this issue also occurs without DRBD. For example, create a filesystem and try to mount it with DAX enabled: mkfs.ext4 -b 4K /dev/<your-lv> mount -o dax /dev/<your-lv> <somewhere> The check the syslog to see whether DAX was successfully enabled. You can see the expected success and failure output here: https://nvdimm.wiki.kernel.org/#filesystems Best regards, Joel PS Please "reply all" to keep the mailing list in CC On Tue, Jun 11, 2019 at 2:53 PM Rob van der Wal <[email protected]> wrote:Hi Joel, I've build the module from source (downloaded from https://www.linbit.com/en/drbd-community/drbd-download/). I think we don't use external metadata and we are using a ssd disk for storing. This is a part of our drbd.conf: drbd.conf: on barentsz { node-id 1; device /dev/drbd0 minor 0; disk /dev/vg_ssd/vm_prace-ldap; meta-disk internal; address ipv4 10.0.0.30:7788; } LVM info: PV /dev/sdb2 VG vg_ssd lvm2 [446.43 GiB / 102.43 GiB free] ACTIVE '/dev/vg_ssd/vm_prace-ldap' [38.00 GiB] inherit The requested line in the syslog is: [1037978.736262] drbd r0/0 drbd0: meta-data IO uses: dax-pmem But I don't think we are using a PMEM device so this looks not correct. Regards, Rob van der Wal
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