|
|
| (3 intermediate revisions by 3 users not shown) |
| Line 2: |
Line 2: |
| {{shortcut|ISOP:mismatch_cnt}} | | {{shortcut|ISOP:mismatch_cnt}} |
|
| |
|
| What to do when a raid device has a mismatch count
| | {{admon/important|This SOP has moved to the fedora Infrastructure SOP git repo. Please see the current document at: [http://infrastructure.fedoraproject.org/infra/docs/infra-raidmismatch.rst mismatch] |
| | | For changes, questions or comments, please contact anyone in the Fedora Infrastructure team. }} |
| == Contact Information ==
| |
| Owner: Fedora Infrastructure Team
| |
| | |
| Contact: #fedora-admin, sysadmin-main
| |
| | |
| Location: All
| |
| | |
| Servers: Physical hosts
| |
| | |
| Purpose: Provides database connection to many of our apps.
| |
| | |
| == Description ==
| |
| | |
| In some situations a raid device may indicate there is a count mismatch as listed in:
| |
| | |
| <pre>
| |
| /sys/block/mdX/md/mismatch_cnt
| |
| </pre>
| |
| | |
| Anything other than 0 is considered not good. Though if the number is low it's probably nothing to worry about. To correct this situation try the directions below
| |
| | |
| == Correction ==
| |
| | |
| More than anything these steps are to A) Verify there is no problem and B) make the error go away. If step 1 and step 2 don't correct the problems, <b>PROCEED WITH CAUTION</b>. The steps below, however, should be relatively safe.
| |
| | |
| === Step 1 ===
| |
| | |
| Issue a repair (replace mdX with the questionable raid device):
| |
| | |
| <pre>
| |
| echo repair > /sys/block/mdX/md/sync_action
| |
| </pre>
| |
| | |
| Depending on the size of the array and disk speed this can take a while. Watch the progress with:
| |
| | |
| <pre>
| |
| cat /proc/mdstat
| |
| </pre>
| |
| | |
| Once that's done proceed to Step 2.
| |
| | |
| === Step 2 ===
| |
| | |
| Issue a check. It's this check that will reset the mismatch count if there are no problems. Again replace mdX with your actual raid device.
| |
| | |
| <pre>
| |
| echo check > /sys/block/mdX/md/sync_action
| |
| </pre>
| |
| | |
| Just as before, you can watch the progress with:
| |
| | |
| <pre>
| |
| cat /proc/mdstat
| |
| </pre>
| |
|
| |
|
| [[Category:Infrastructure SOPs]] | | [[Category:Infrastructure SOPs]] |
