From: Andreas Klauer <Andreas.Klauer@metamorpher.de>
To: Wols Lists <antlists@youngman.org.uk>
Cc: linux-raid <linux-raid@vger.kernel.org>
Subject: Re: Linux raid wiki - setting up a system - advice wanted :-)
Date: Mon, 26 Sep 2016 04:16:22 +0200 [thread overview]
Message-ID: <20160926021622.GA25056@metamorpher.de> (raw)
In-Reply-To: <57E83EA8.9060809@youngman.org.uk>
On Sun, Sep 25, 2016 at 10:16:24PM +0100, Wols Lists wrote:
> I need to know what will happen if you give entire drives to mdadm.
Installers will pick unpartitioned disks first. Forget just trashing
the metadata, easy to accidentally write across the entire disk.
This is what it looks like when installing Windows: http://imgur.com/a/GtcR2
Same can happen with Linux installers. Unpartitioned disks are just unusual.
Not sure why this is a thing anyway. There's no downside to partitions.
Adds a safety margin, is yet another place that has metadata (with GPT
you can use mdnumber-role as partition name / partlabel), doesn't harm
performance in any way...
People panic too much about partition alignment? But alignment is something
you need to provide through all layers, all the way down to the filesystem,
not just partitions. Besides, MiB alignment has been standard for years now,
so this shouldn't be a problem.
The only other obscure issue with partition tables I can think of is
enclosures for USB-HDD that emulate the wrong sector size (4K vs 512)
and unfortunately GPT still depends on the sector size; and Linux is
not flexible/smart enough to support alien sector size GPT partitions.
So if you switch HDD enclosures you might be forced to recreate
the partition table before you can access your data.
Regards
Andreas Klauer
next prev parent reply other threads:[~2016-09-26 2:16 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-25 21:16 Linux raid wiki - setting up a system - advice wanted :-) Wols Lists
2016-09-26 0:59 ` Francisco Parada
2016-09-26 8:17 ` keld
2016-09-26 2:16 ` Andreas Klauer [this message]
2016-09-26 3:40 ` Adam Goryachev
2016-09-26 6:50 ` Wols Lists
2016-09-26 14:13 ` Phil Turmel
2016-09-26 15:48 ` Wols Lists
2016-09-26 9:30 ` keld
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