Aside from this write-mostly sysfs support, is there a way to toggle
the write-mostly bit of an md member with mdadm? I couldn't identify
a clear way to do so.
It'd be nice if mdadm --assemble would honor --write-mostly...
On 6/1/06, NeilBrown <neilb@xxxxxxx> wrote:
It appears in /sys/mdX/md/dev-YYY/state
and can be set or cleared by writing 'writemostly' or '-writemostly'
respectively.
Signed-off-by: Neil Brown <neilb@xxxxxxx>
### Diffstat output
./Documentation/md.txt | 5 +++++
./drivers/md/md.c | 12 ++++++++++++
2 files changed, 17 insertions(+)
diff ./Documentation/md.txt~current~ ./Documentation/md.txt
--- ./Documentation/md.txt~current~ 2006-06-01 15:05:30.000000000 +1000
+++ ./Documentation/md.txt 2006-06-01 15:05:30.000000000 +1000
@@ -309,6 +309,9 @@ Each directory contains:
faulty - device has been kicked from active use due to
a detected fault
in_sync - device is a fully in-sync member of the array
+ writemostly - device will only be subject to read
+ requests if there are no other options.
+ This applies only to raid1 arrays.
spare - device is working, but not a full member.
This includes spares that are in the process
of being recoverred to
@@ -316,6 +319,8 @@ Each directory contains:
This can be written to.
Writing "faulty" simulates a failure on the device.
Writing "remove" removes the device from the array.
+ Writing "writemostly" sets the writemostly flag.
+ Writing "-writemostly" clears the writemostly flag.
errors
An approximate count of read errors that have been detected on
diff ./drivers/md/md.c~current~ ./drivers/md/md.c
--- ./drivers/md/md.c~current~ 2006-06-01 15:05:30.000000000 +1000
+++ ./drivers/md/md.c 2006-06-01 15:05:30.000000000 +1000
@@ -1737,6 +1737,10 @@ state_show(mdk_rdev_t *rdev, char *page)
len += sprintf(page+len, "%sin_sync",sep);
sep = ",";
}
+ if (test_bit(WriteMostly, &rdev->flags)) {
+ len += sprintf(page+len, "%swrite_mostly",sep);
+ sep = ",";
+ }
if (!test_bit(Faulty, &rdev->flags) &&
!test_bit(In_sync, &rdev->flags)) {
len += sprintf(page+len, "%sspare", sep);
@@ -1751,6 +1755,8 @@ state_store(mdk_rdev_t *rdev, const char
/* can write
* faulty - simulates and error
* remove - disconnects the device
+ * writemostly - sets write_mostly
+ * -writemostly - clears write_mostly
*/
int err = -EINVAL;
if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
@@ -1766,6 +1772,12 @@ state_store(mdk_rdev_t *rdev, const char
md_new_event(mddev);
err = 0;
}
+ } else if (cmd_match(buf, "writemostly")) {
+ set_bit(WriteMostly, &rdev->flags);
+ err = 0;
+ } else if (cmd_match(buf, "-writemostly")) {
+ clear_bit(WriteMostly, &rdev->flags);
+ err = 0;
}
return err ? err : len;
}
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