From: Rick James
Date: October 4 2012 9:40pm
Subject: RE: InnoDB corrupt after power failure
List-Archive: http://lists.mysql.com/mysql/228330
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I hope you turned OFF caching on the drives, themselves.  The BBU should be=
 the single place that caches and is trusted to survive a power outage.

> -----Original Message-----
> From: Andrew Miklas [mailto:andrew@stripped]
> Sent: Thursday, October 04, 2012 2:16 PM
> To: Manuel Arostegui
> Cc: mysql@stripped
> Subject: Re: InnoDB corrupt after power failure
>=20
> Hi Manuel,
>=20
> Thanks for the fast reply.
>=20
> On Oct 4, 2012, at 12:05 AM, Manuel Arostegui wrote:
> <snip>
> > it shouldn't be a biggie if you have a BBU. Do you guys use HW RAID +
> BBU?
>=20
> We've checked with our hosting provider, and the database was indeed
> stored on a BBU RAID.
>=20
> > What's your innodb_flush_log_at_trx_commit value?
>=20
> mysql> show variables like 'innodb_flush_log_at_trx_commit'\G
> *************************** 1. row ***************************
> Variable_name: innodb_flush_log_at_trx_commit
>         Value: 1
> 1 row in set (0.00 sec)
>=20
>=20
> > Have you tried playing with innodb_force_recovery option to try to
> get the server started at least? That way you might be able to identify
> which table(s) is/are the corrupted one and the one(s) preventing the
> whole server from booting up.
>=20
> As the affected machine was just a read only slave, it was easier for
> me to get things back into service by just reloading off the master.
> Unfortunately, I didn't think to keep the corrupted ibd files for later
> debugging.
>=20
> At this point, I'm more trying to figure out if there's something wrong
> with the DB or host config.  There was effectively no data loss, but
> I'm worried we might have data loss or availability issues if this
> error crops up on our master server.
>=20
>=20
> Thanks,
>=20
>=20
> Andrew
>=20
>=20
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