I noticed that db1078 (s3 primary master) has had its battery being re-charged for the last 3 days. Which is strange, taking a look at the HW logs I found this:
/system1/log1/record7
Targets
Properties
number=7
severity=Caution
date=02/14/2019
time=19:10
description=Smart Storage Battery pre-failure (Battery 1). Action: 1. Consult server troubleshooting guide. 2 Gather AHS log and contact Support@Cmjohnson or @RobH please advise.
| Status | Assigned | Task | ||
|---|---|---|---|---|
| Resolved | Cmjohnson | T219115 db1078 s3 primary DB master BBU pre-failure | ||
| Resolved | Johan | T220080 Emergency database primary master failover on s3 | ||
| Resolved | Trizek-WMF | T220508 Setup a banner for emergency database primary master failover on s3 |
Your case was successfully submitted. Please note your Case ID: 5337355107 for future reference.
Thanks for the update @Cmjohnson!
Are the HP hosts that can have the BBU changed with no disruption or should we plan a failover for this host?
Thanks!
@Cmjohnson let us know that the BBU arrived and he'll need to put the server down to be able to replace it.
So we need to do a failover and failback to db1075 (the previous master until we had to emergency do a failover due to a PDU maintenance T213858: s3 master emergency failover (db1075).
We need to create a task to request for read only once we agreed on possible dates. Considering the fact that we should normally give around 2 weeks notice (unless we are in an emergency, which I think we fully aren't) and given that we have Easter coming soon.
I propose Wednesday 24th at 5:00AM UTC
@jcrespo would that be ok with you? if so, I will create a task for the read-only.
We have agreed that we want to aim for 11th April to avoid the risk of the master going down unexpectedly during the upcoming Easter holidays where there will be less coverage
Change 501479 had a related patch set uploaded (by Marostegui; owner: Marostegui):
[operations/puppet@production] mariadb: Promote db1075 to master
Change 501480 had a related patch set uploaded (by Marostegui; owner: Marostegui):
[operations/mediawiki-config@master] db-eqiad.php: Set s3 to read only
Change 501481 had a related patch set uploaded (by Marostegui; owner: Marostegui):
[operations/mediawiki-config@master] db-eqiad.php: Promote db1075 to master
Change 501483 had a related patch set uploaded (by Marostegui; owner: Marostegui):
[operations/dns@master] wmnet: Update s3-master alias
@jcrespo would you mind taking a look at the above patches ^
I have also updated our etherpad with the plan
Thanks!
Mentioned in SAL (#wikimedia-operations) [2019-04-11T04:14:11Z] <marostegui> Disable GTID on s3 hosts - https://phabricator.wikimedia.org/T219115
Mentioned in SAL (#wikimedia-operations) [2019-04-11T04:18:49Z] <marostegui> Start topology changes to move s3 slaves under db1075 T219115
Mentioned in SAL (#wikimedia-operations) [2019-04-11T04:32:22Z] <marostegui> Disable puppet on db1078 and db1075 T219115
Change 501479 merged by Marostegui:
[operations/puppet@production] mariadb: Promote db1075 to master
Change 501480 merged by jenkins-bot:
[operations/mediawiki-config@master] db-eqiad.php: Set s3 to read only
Change 501481 merged by jenkins-bot:
[operations/mediawiki-config@master] db-eqiad.php: Promote db1075 to master
Mentioned in SAL (#wikimedia-operations) [2019-04-11T05:00:18Z] <marostegui> Starting s3 failover from db1078 to db1075 - T219115
Mentioned in SAL (#wikimedia-operations) [2019-04-11T05:01:05Z] <marostegui@deploy1001> Synchronized wmf-config/db-eqiad.php: Set s3 on read-only T219115 (duration: 00m 37s)
Mentioned in SAL (#wikimedia-operations) [2019-04-11T05:02:48Z] <marostegui@deploy1001> Synchronized wmf-config/db-eqiad.php: Switchover s3 master eqiad from db1078 to db1075 T219115 (duration: 00m 36s)
Mentioned in SAL (#wikimedia-operations) [2019-04-11T05:03:55Z] <marostegui@deploy1001> Synchronized wmf-config/db-eqiad.php: Remove s3 ready only T219115 (duration: 00m 36s)
Change 501483 merged by Marostegui:
[operations/dns@master] wmnet: Update s3-master alias
@Cmjohnson can we schedule the BBU replacement for Monday 15th? db1078 is no longer a master.
The failover was performed successfully:
Times in UTC:
Read only starts: 05:01:05
Read only stops: 05:03:55
Total read only time: 02:50 minutes
Change 504019 had a related patch set uploaded (by Jcrespo; owner: Jcrespo):
[operations/mediawiki-config@master] mariadb: Reduce db1078 load in preparation for depool
Change 504022 had a related patch set uploaded (by Jcrespo; owner: Jcrespo):
[operations/mediawiki-config@master] mariadb: Depool db1078 for hardware maintenance
Change 504019 merged by jenkins-bot:
[operations/mediawiki-config@master] mariadb: Reduce db1078 load in preparation for depool
Change 504022 merged by jenkins-bot:
[operations/mediawiki-config@master] mariadb: Depool db1078 for hardware maintenance
Mentioned in SAL (#wikimedia-operations) [2019-04-16T16:41:25Z] <jynus> disabling notifications on db1078 T219115
Mentioned in SAL (#wikimedia-operations) [2019-04-16T16:43:55Z] <jynus> upgrading and shutting down db1078 T219115
This is fixed, but not closing because I cannot repool the server yet (Deployment schedule conflic). I will repool it tomorrow and resolve it.
Change 504513 had a related patch set uploaded (by Jcrespo; owner: Jcrespo):
[operations/mediawiki-config@master] mariadb: Repool db1078 with full weight
Change 504513 merged by jenkins-bot:
[operations/mediawiki-config@master] mariadb: Repool db1078 with full weight