> -----Original Message----- > From: Digimer <[email protected]> > Sent: Wednesday, June 2, 2021 7:23 PM > To: Eric Robinson <[email protected]>; [email protected] > Subject: Re: [DRBD-user] The Problem of File System Corruption w/DRBD > > On 2021-06-02 5:17 p.m., Eric Robinson wrote: > > Since DRBD lives below the filesystem, if the filesystem gets > > corrupted, then DRBD faithfully replicates the corruption to the other > > node. Thus the filesystem is the SPOF in an otherwise shared-nothing > architecture. > > What is the recommended way (if there is one) to avoid the filesystem > > SPOF problem when clusters are based on DRBD? > > > > -Eric > > To start, HA, like RAID, is not a replacement for backups. That is the answer > to a situation like this... HA (and other availability systems like RAID) > protect > against component failure. If a node fails, the peer recovers automatically > and your services stay online. That's what DRBD and other HA solutions strive > to provide; uptime. > > If you want to protect against corruption (accidental or intentional, a-la > cryptolockers), you need a robust backup system to _compliment_ your HA > solution. >
Yes, thanks, I've said for many years that HA is not a replacement for disaster recovery. Still, it is better to avoid downtime than to recover from it, and one of the main ways to achieve that is through redundancy, preferably a shared-nothing approach. If I have a cool 5-node cluster and the whole thing goes down because the filesystem gets corrupted, I can restore from backup, but management is going to wonder why a 5-node cluster could not provide availability. So the question remains: how to eliminate the filesystem as the SPOF? -Eric Disclaimer : This email and any files transmitted with it are confidential and intended solely for intended recipients. If you are not the named addressee you should not disseminate, distribute, copy or alter this email. Any views or opinions presented in this email are solely those of the author and might not represent those of Physician Select Management. Warning: Although Physician Select Management has taken reasonable precautions to ensure no viruses are present in this email, the company cannot accept responsibility for any loss or damage arising from the use of this email or attachments. _______________________________________________ Star us on GITHUB: https://github.com/LINBIT drbd-user mailing list [email protected] https://lists.linbit.com/mailman/listinfo/drbd-user
