From: hugo rivera <uair00@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] venti backup
Date: Mon, 23 Jan 2012 11:28:51 +0100 [thread overview]
Message-ID: <CAFo14L2pgMD_zp3eo+M5BnNDuYGXYdUbPt3MQV-_LqD17TDnFA@mail.gmail.com> (raw)
In-Reply-To: <20120120233911.6ba91fec@gmail.com>
OK, thanks a lot for your help!
2012/1/20 David du Colombier <0intro@gmail.com>:
>> Does the presence of the trailer imply that I should add an extra
>> block to the arenas backup?
>> If my last arena is
>>
>> arena='arenas059' [31676186624,32213057536)
>>
>> then I should backup 32213057536+8192 bytes instead of 32213057536?
>
> No, the trailer is located at the end of the arena,
> just after clump info.
>
> The second number you see is the start of the next arena.
> It is preceded by two blocks:
>
> - the arena header of the next arena,
> - the arena trailer of the precedent arena.
>
> 32213057536/8192 = 3932258
>
> In you example, arenas060 start at 3932258, so the header of
> arenas060 is 3932257 and the trailer of arenas059 is 3932256.
>
> You should really backup from 1048576-8192 (start of arenas00,
> including header) to 32213057536-2*8192 (end of arenas059,
> including trailer).
>
> Like many Venti tools, checkarenas check each arena header
> and trailer and verify they match. So you should be confident.
>
> --
> David du Colombier
>
--
Hugo
prev parent reply other threads:[~2012-01-23 10:28 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-17 12:34 hugo rivera
2012-01-17 13:02 ` Steve Simon
2012-01-17 13:14 ` hugo rivera
2012-01-17 13:04 ` David du Colombier
2012-01-19 16:11 ` hugo rivera
2012-01-19 16:45 ` David du Colombier
2012-01-19 23:04 ` David du Colombier
2012-01-20 11:03 ` hugo rivera
2012-01-20 15:02 ` David du Colombier
2012-01-20 17:04 ` hugo rivera
2012-01-20 18:19 ` David du Colombier
2012-01-20 19:10 ` hugo rivera
2012-01-20 22:39 ` David du Colombier
2012-01-23 10:28 ` hugo rivera [this message]
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