Change of the default value in the kernel:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d2be537c3ba35
To query the device:
sg_inq -p 0xb0 /dev/sdX | grep "[ml] transfer length:"
Note: some arrays does not report any value.
3PAR: 65534 blocks
RDAC: not reported
Hitachi VSP: query error
Cc: Martin Wilck <mwi...@suse.com>
Cc: Benjamin Marzinski <bmarz...@redhat.com>
Cc: Christophe Varoqui <christophe.varo...@opensvc.com>
Cc: DM-DEVEL ML <dm-devel@redhat.com>
Signed-off-by: Xose Vazquez Perez <xose.vazq...@gmail.com>
---
multipath/multipath.conf.5 | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/multipath/multipath.conf.5 b/multipath/multipath.conf.5
index 8ef3a747..21963813 100644
--- a/multipath/multipath.conf.5
+++ b/multipath/multipath.conf.5
@@ -1240,9 +1240,11 @@ The default is: \fB0\fR
.B max_sectors_kb
Sets the max_sectors_kb device parameter on all path devices and the multipath
device to the specified value.
+If the storage device(array, hard disk, ...) does not export the value to the
+system, the kernel sets it to 512(kernel < 4.3) or 1024(kernel >= 4.3).
.RS
.TP
-The default is: \fB<device dependent>\fR
+The default is: \fB<device dependent>\fR, or kernel provided if there is no
value.
.RE
.
.
--
2.30.1
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