From 2c958b35ba11c61dd2b7416d2f6067655512d2b9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 10 Apr 2024 22:55:45 +0200 Subject: Adding debian version 4.3-1. Signed-off-by: Daniel Baumann --- debian/local/doc/README.checkarray | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 debian/local/doc/README.checkarray (limited to 'debian/local/doc/README.checkarray') diff --git a/debian/local/doc/README.checkarray b/debian/local/doc/README.checkarray new file mode 100644 index 0000000..8071a4d --- /dev/null +++ b/debian/local/doc/README.checkarray @@ -0,0 +1,33 @@ +checkarray notes +================ + +checkarray will run parity checks across all your redundant arrays. By +default, it is configured to run on the first Sunday of each month, at 01:06 +in the morning. This is realised by asking cron to wake up every Sunday with +/etc/cron.d/mdadm, but then only running the script when the day of the month +is less than or equal to 7. See #380425. + +Cron will try to run the check at "idle I/O priority" (see ionice(1)), so that +the check does not overload the system too much. Note that this will only +work if all the component devices of the array employ the (default) "cfq" I/O +scheduler. See the kernel documentation[0] for information on how to verify +and modify the scheduler. checkarray does not verify this for you. + + 0. http://www.kernel.org/doc/Documentation/block/switching-sched.txt + +If you manually invoke checkarray, it runs with default I/O priority. Should +you need to run a check at a higher (or lower) I/O priority, then have a look +at the --idle, --slow, --fast, and --realtime options. + +'check' is a read-only operation, even though the kernel logs may suggest +otherwise (e.g. /proc/mdstat and several kernel messages will mention +"resync"). Please also see question 21 of the FAQ. + +If, however, while reading, a read error occurs, the check will trigger the +normal response to read errors which is to generate the 'correct' data and try +to write that out - so it is possible that a 'check' will trigger a write. +However in the absence of read errors it is read-only. + +You can cancel a running array check with the -x option to checkarray. + + -- martin f. krafft Thu, 02 Sep 2010 10:27:29 +0200 -- cgit v1.2.3