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Re: KVM: writethrough / writeback - data integrity



Bruce,

thank you for your reply.

> This wholly depends on what kind of application and/or database you're
> hosting on your production server; and, it also depends on what kind of
> back-end infrastructure (SAN? Virtualized Lx? VMware, Xen, otherwise?) --

it's a server RAID-5. One partition is a KVM raw image file (host uses
ext4), the other a partition on the host system passed to KVM guest. Host
and guest are Debian Jessie.

> Write-through, write-back and mixed-mode options have implications that
> will affect the performance, redundancy, availability and time-to-recover
> of your production applications.  Are you using any database software?

Dovecot with Maildir.

> In example, production DB filesystems can have different mount options and
> attributes as listed in /etc/fstab and based on production requirements.

The partitions have ext4 file system.

- Chris


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