Good fencing prevents split-brains, period. Setup pacemaker, setup and
test stonith, configure DRBD to use 'fencing resource-and-stonith;' and
enable the crm-{un,}fence-peer.sh' {un,}fence-handlers. The setup
pacemaker to colocate the DRBD resource -> FS -> IP.digimer On 2017-10-05 05:01 PM, José Andrés Matamoros Guevara wrote: > Don't know yet. Thinking about using pacemaker, for high availability. But > have a manually recovery to avoid split brain - corruption data situations. > Maybe we are going to use three-four servers to have a disaster recovery site. > > Andres. > > -----Original Message----- > From: Digimer [mailto:li...@alteeve.ca] > Sent: Thursday, 5 October, 2017 12:43 PM > To: José Andrés Matamoros Guevara <amatamo...@ie.com.sv>; > drbd-user@lists.linbit.com > Subject: Re: [DRBD-user] Moving TeraBytes to drbd device > > Will you be using pacemaker for auto-recovery, or are you planning to do > fully manual recovery? > > digimer > > On 2017-10-05 12:19 PM, José Andrés Matamoros Guevara wrote: >> OK. That's a procedure I have thought about, but didn't know if there were >> another more effective. I just have to check how much data I have to sync >> during the window. >> >> Last question: what kind of test do you recommend to check the new drbd >> system? I have configure a few systems but never this important. >> >> Thanks again, >> >> Andres. >> >> >> -----Original Message----- >> From: Digimer [mailto:li...@alteeve.ca] >> Sent: Wednesday, 4 October, 2017 11:11 PM >> To: José Andrés Matamoros Guevara <amatamo...@ie.com.sv>; >> drbd-user@lists.linbit.com >> Subject: Re: [DRBD-user] Moving TeraBytes to drbd device >> >> If it were up to me, given what I understand of your requirements (which is >> minimal), I'd look at setting up the new DRBD system. Test it carefully and >> when ready, do an rsync to get the bulk data over. When your windows opens, >> re-run the rsync to copy just what's changed. >> >> If you're asking how to setup a DRBD based system, we'll need to know more >> about what you want the system to do. >> >> cheers, >> >> digimer >> >> On 2017-10-04 11:29 PM, José Andrés Matamoros Guevara wrote: >>> Thanks for your answer. >>> >>> Yes, I need to copy a SAN to a new drbd system. And yes, I'll check >>> with LinBit for support if I don't find a safe solution for myself. >>> >>> Just a question: I have been looking through the LinBit documents and >>> haven't found exactly what I was looking for. If you can point me >>> about what document/documents or topics I have to read about, will be great. >>> >>> Thanks for the info. >>> >>> Andres. >>> >>> -----Original Message----- >>> From: Digimer [mailto:li...@alteeve.ca] >>> Sent: Tuesday, 3 October, 2017 6:10 PM >>> To: José Andrés Matamoros Guevara <amatamo...@ie.com.sv>; >>> drbd-user@lists.linbit.com >>> Subject: Re: [DRBD-user] Moving TeraBytes to drbd device >>> >>> On 2017-10-03 06:57 PM, José Andrés Matamoros Guevara wrote: >>>> I have been consulted about moving multiple Terabytes to a new >>>> system using drbd to ensure high availability. I have been thinking >>>> on multiple scenarios to move the data as fast as I can and to have >>>> a minimal maintenance window to change the systems. >>>> >>>> Is there any how-to or recommendation about it? I know it is not >>>> exactly a drbd consult but I supposed you have been using it for a >>>> while and have more idea about a best practice. I have thought to >>>> have a backup program to copy the data and then update it during the >>>> maintenance window, but been lots of TB, the reading/writing data >>>> time is going to be the factor to consider. >>>> >>>> Thanks in advance and best regards, Andres. >>> >>> The best answer is to engage LINBIT for commercial support if you've >>> been tasked with a sensitive project and a minimal window to do it in. >>> >>> That said, I'll share what comes to mind; >>> >>> If you mean "move" as in "copy the data to a new system that already >>> has DRBD configured and tested", then it is merely a question of hardware. >>> Make sure you have a sufficiently fast new system to accept the >>> incoming volume of data within the prescribed time frame. DRBD itself >>> has minimal overhead, so it is really a question of the speed of the >>> disks and the replication link. >>> >>> If you mean to convert an existing filesystem on existing hardware to >>> be backed by DRBD, then you need to either grow the backing storage >>> by ~32MiB per TiB of existing data, or setup a matching sized storage >>> device and configure external metadata. With that extra space, you >>> can setup DRBD and it will see the existing FS and data fine. You'll >>> need a full resync to the new peer, of course. Also, test/practice >>> outside prod thoroughly to be certain you have the steps down pat. >>> >>> There are docs on how to do this openly available on LINBIT's website. >>> If you get stuck on certain steps, post specific questions and we'll help. >>> >>> -- >>> Digimer >>> Papers and Projects: https://alteeve.com/w/ "I am, somehow, less >>> interested in the weight and convolutions of Einstein’s brain than in >>> the near certainty that people of equal talent have lived and died in >>> cotton fields and sweatshops." - Stephen Jay Gould >>> >> >> >> -- >> Digimer >> Papers and Projects: https://alteeve.com/w/ "I am, somehow, less >> interested in the weight and convolutions of Einstein’s brain than in >> the near certainty that people of equal talent have lived and died in >> cotton fields and sweatshops." - Stephen Jay Gould >> > > > -- > Digimer > Papers and Projects: https://alteeve.com/w/ "I am, somehow, less interested > in the weight and convolutions of Einstein’s brain than in the near certainty > that people of equal talent have lived and died in cotton fields and > sweatshops." - Stephen Jay Gould > -- Digimer Papers and Projects: https://alteeve.com/w/ "I am, somehow, less interested in the weight and convolutions of Einstein’s brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops." - Stephen Jay Gould _______________________________________________ drbd-user mailing list drbd-user@lists.linbit.com http://lists.linbit.com/mailman/listinfo/drbd-user
