linux-ext4 - Re: ext4 64bit (disk >16TB) question

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Message-ID: <87tzer9lcx.fsf@frosties.localdomain>
Date:	Tue, 15 Jul 2008 18:13:18 +0200
From:	Goswin von Brederlow <goswin-v-b@....de>
To:	rwheeler@...hat.com
Cc:	linux-ext4@...r.kernel.org
Subject: Re: ext4 64bit (disk >16TB) question

Ric Wheeler <rwheeler@...hat.com> writes:

> How long would you wait for something like fsck to run to completion
> before you would need to go to back up tapes? 6 hours? 1 day? 1 week
> ;-) ?

Backup? What are backups? :))

A hardware raid6 resync takes about 16h. A Software raid6 (over 6
hardware raid6) resync takes 1-2 days.

With lustre the fsck has to be done on the MDT (meta data target) to
build a database file and on all the OST (object storage target). So
there is some parallelization in the system.

But each OST, if we get ext4 64bit working, would be 28TB. I would
assume days for an fsck run. Weeks would not be good and less than a
day is totaly unrealistic.

But a few days for an fsck of 400-800TB filesystem isn't so
bad. Reading that amount from backup will take ages too, if you even
have one.

MfG
        Goswin
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