Re: [9fans] Re: venti/mirrorarenas usage

[Charles Forsyth <charles.forsyth@gmail.com>]

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yes. i use it to mirror my venti arenas on other ssds, partitioned the same
as the original , with a short script run by the cron on the venti server.
mirror:
#!/bin/rc
venti/mirrorarenas -v /dev/sdE0/arenas0 /dev/sdE1/arenas0
venti/mirrorarenas -v /dev/sdE0/arenas0 /dev/sdE2/arenas0
date

On Wed, 31 Jul 2024 at 03:08, <moody@posixcafe.org> wrote:

> If you look at the top of the file you'll see:
>
> /*
>  * Mirror one arena partition onto another.
>  * Be careful to copy only new data.
>  */
>
>
> Now if you combine this with some of the information from venti(8):
>
>           The data log is logically split into sections called arenas,
>           typically sized for easy offline backup (e.g., 500MB).  A
>           data log may comprise many disks, each storing one or more
>           arenas.  Such disks are called arena partitions. Arena par-
>           titions are filled in the order given in the configuration.
>
>
> My best guess is that this is an incremental backup tool, where you give
> it a source and destination arena partition and the code looks at both,
> figures out the deltas, then copies over only what is needed. The venti
> code is a bit inscrutable and I'm no venti guy so take this with a grain of
> salt.
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