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drbd: Load balancing of read requests

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New config option for the disk secition "read-balancing", with
the values: prefer-local, prefer-remote, round-robin, when-congested-remote.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner 2011-11-11 12:31:20 +01:00
parent d10b4ea32b
commit 380207d08e
6 changed files with 68 additions and 2 deletions
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8
include/linux/drbd.h
View file

@ -102,6 +102,14 @@ enum drbd_on_congestion {
OC_DISCONNECT,
};
enum drbd_read_balancing {
RB_PREFER_LOCAL,
RB_PREFER_REMOTE,
RB_ROUND_ROBIN,
RB_LEAST_PENDING,
RB_CONGESTED_REMOTE,
};
/* KEEP the order, do not delete or insert. Only append. */
enum drbd_ret_code {
ERR_CODE_BASE = 100,