7:03 a.m.
Hi all,
Recently I was doing experiment about persistent memory, so I followed the
quick setup guide on https://nvdimm.wiki.kernel.org to config dax. But when
I mounted /dev/pmem0 I got an error. The prompting message is:
[root@localhost cholerae]# mount -o dax /dev/pmem0 /mnt/mem
mount: wrong fs type, bad option, bad superblock on /dev/pmem0,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so.
[root@localhost cholerae]# dmesg | tail
[ 27.357100] cfg80211: DFS Master region: FCC
[ 27.357101] cfg80211: (start_freq - end_freq @ bandwidth),
(max_antenna_gain, max_eirp), (dfs_cac_time)
[ 27.357104] cfg80211: (2402000 KHz - 2482000 KHz @ 40000 KHz), (N/A,
2000 mBm), (N/A)
[ 27.357107] cfg80211: (5170000 KHz - 5250000 KHz @ 80000 KHz, 160000
KHz AUTO), (N/A, 2300 mBm), (N/A)
[ 27.357110] cfg80211: (5250000 KHz - 5330000 KHz @ 80000 KHz, 160000
KHz AUTO), (N/A, 2300 mBm), (0 s)
[ 27.357112] cfg80211: (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A,
3000 mBm), (N/A)
[ 27.357114] cfg80211: (57240000 KHz - 59400000 KHz @ 2160000 KHz),
(N/A, 2800 mBm), (N/A)
[ 27.357116] cfg80211: (59400000 KHz - 63720000 KHz @ 2160000 KHz),
(N/A, 4400 mBm), (N/A)
[ 27.357118] cfg80211: (63720000 KHz - 65880000 KHz @ 2160000 KHz),
(N/A, 2800 mBm), (N/A)
[ 81.779582] EXT4-fs (pmem0): error: unsupported blocksize for dax
My kernel version is 4.2.8, distribution is fedora23. I can't find out the
reason, can anyone give me a hand? Thanks.