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Date:      Fri, 24 Jun 2011 15:21:00 -0700
From:      mdf@FreeBSD.org
To:        Garance A Drosehn <gad@freebsd.org>
Cc:        freebsd-fs@freebsd.org, Robert Watson <rwatson@freebsd.org>
Subject:   Re: [rfc] 64-bit inode numbers
Message-ID:  <BANLkTimV26R4ARgrc9-KRgj8wyuU1%2BcqWg@mail.gmail.com>
In-Reply-To: <4E04FC7F.6090801@FreeBSD.org>
References:  <20101201091203.GA3933@tops> <20110104175558.GR3140@deviant.kiev.zoral.com.ua> <20110120124108.GA32866@tops.skynet.lt> <4E027897.8080700@FreeBSD.org> <20110623064333.GA2823@tops> <20110623081140.GQ48734@deviant.kiev.zoral.com.ua> <4E03B8C4.6040800@FreeBSD.org> <20110623222630.GU48734@deviant.kiev.zoral.com.ua> <4E04FC7F.6090801@FreeBSD.org>

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On Fri, Jun 24, 2011 at 2:07 PM, Garance A Drosehn <gad@freebsd.org> wrote:
> The AFS cell at RPI has approximately 40,000 AFS volumes, and each
> volume should have it's own dev_t (IMO).
>
> Please realize that I do not mind if people felt that there was no
> need to increase the size of dev_t at this time, and that we should
> wait until we see more of a demand for increasing it. =A0But given the
> project to increase the size of inode numbers, I thought this was a
> good time to also ask about dev_t. =A0I ask about it every few years :-)

I don't see why 32 bits are anywhere close to becoming tight to
represent 40k unique values.  Is there something wrong with how each
new dev_t is computed, that runs out of space quicker than this
implies?

Thanks,
matthew



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