[ClusterLabs] Preventing multiple resources from moving at the same time.
matt.s at aptalaska.net
Wed Apr 21 14:04:48 EDT 2021
On 4/21/21 10:21 AM, Andrei Borzenkov wrote:
>> If I set the stickiness to 100 then it's a race condition, many times we
>> get the storage layer migrated without VirtualDomain noticing, but if
>> the stickiness is not set, then moving a resource causes the cluster to
>> re-balance and will cause the VM to fail every time because validation
>> is one of the first things we do when we migrate the VM, and it's at the
>> same time as a IP-ZFS-iSCSI move so the config file goes away for 5
>> I'm not sure how to fix this. The nodes don't have local storage that
> Your nodes must have operating system and pacemaker stack loaded from
> somewhere before they can import zfs pool.
Yup, and they do. There are plenty of ways to do this: internal SD
card, usb boot, pxe boot, etc.... I prefer this because I don't need to
maintain a boot drive, the nodes boot from the exact same image, and I
have gobs of memory so the running system can run in a ramdisk. This
also makes it possible to boot my nodes with failed disks/controllers
which makes troubleshooting easier. I basically made a live CD distro
that has everything I need.
>> I suppose the next step is to see if NFS has some sort of retry mode so
> That is what "hard" mount option is for.
Thanks, I'll take a look.
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