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drbd: new configuration parameter c-min-rate

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We now track the data rate of locally submitted resync related requests,
and can thus detect non-resync activity on the lower level device.

If the current sync rate is above c-min-rate, and the lower level device
appears to be busy, we throttle the resyncer.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2010-08-11 23:40:24 +02:00 • committed by Philipp Reisner
commit 0f0601f4ea
7 changed files with 116 additions and 17 deletions
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4
include/linux/drbd_limits.h
View file

@ -150,5 +150,9 @@
#define DRBD_C_MAX_RATE_MAX (4 << 20)
#define DRBD_C_MAX_RATE_DEF 102400
#define DRBD_C_MIN_RATE_MIN 0 /* kByte/sec */
#define DRBD_C_MIN_RATE_MAX (4 << 20)
#define DRBD_C_MIN_RATE_DEF 4096
#undef RANGE
#endif