Date: Fri, 11 May 2012 05:18:16 -0400 From: Alejandro Imass <ait@p2ee.org> To: Polytropon <freebsd@edvax.de> Cc: freebsd-questions@freebsd.org Subject: Re: UFS Crash and directories now missing Message-ID: <CAHieY7S8Xz1KUCfFnt8s3EnqAwGLPc4Bh%2BaDoRp0j0SNVodcLg@mail.gmail.com> In-Reply-To: <20120509154807.b6e9ee4e.freebsd@edvax.de> References: <CAHieY7SWCE4KWFsDKy64tzQwhsnMTcuxLs07hoc9D2s4Y%2BmRFg@mail.gmail.com> <CAHieY7QeLP2QZXW7EGJ5Pb7MnES0cgzJrn%2BhB_6q0oyLy94HZw@mail.gmail.com> <CAHieY7TaW7pxrdd_bXgvcgYaQZN_Ju3rVpx5PRoTbxY3wWA1yQ@mail.gmail.com> <201205091953.28091.erich@alogreentechnologies.com> <CAHieY7Rgh81kXts_n2uEMyr-in4hVw1LpvVABB70gap7PpLMsQ@mail.gmail.com> <20120509154807.b6e9ee4e.freebsd@edvax.de>
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On Wed, May 9, 2012 at 9:48 AM, Polytropon <freebsd@edvax.de> wrote:
> On Wed, 9 May 2012 09:30:37 -0400, Alejandro Imass wrote:
>> On Wed, May 9, 2012 at 8:53 AM, Erich Dollansky
>> <erich@alogreentechnologies.com> wrote:
>> >> For your recommendation above, what are the advantages or differences
>> >> of slicing the disk versus partitioning on a single slice?
>> >>
>> > it could be a misunderstanding. What is a partition? What is a slice. =
I have to look always into the handbook. Anyway, as long the OS see differe=
nt units which have to be mounted independent of each other, it all does no=
t matter what is what.
>> >
>>
>> I meant in Unix terms of course. Slice is slice (partition in other
>> OS) and partition a thru h
>>
>> The question is if it has any advantage of using a slice to mount the
>> basejail in RO as opposed to doing the same thing on a partition.
>
> The answer is: It it not possible. :-)
>
> You cannot mount a slice.
>
> Given the BSD terminology: A slice _has_ to contain partitions.
> You cannot format a slice, you can only format partitions. A
> formatted partition carries a UFS file system. (However, it's
> possible to omit the slice, and partition the whole disk instead,
> this is called "dedicated mode"). A third method is formatting
> the whole disk ("the 'c' device"), in that case the 'c' is omitted.
>
> The _only_ time you can mount a slice is when it is used in its
> common meaning, being a "DOS primary partition"; in this case,
> a FAT or NTFS file system will be placed directly into a slice,
> as those do not support any (BSD-style) partitioning.
>
> /dev/ad0 =A0 =A0 =A0 =A0-> the disk
> /dev/ad0s1 =A0 =A0 =A0-> 1st slice
> /dev/ad0s1a =A0 =A0 -> 1st partition on 1st slice
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 THIS is something you can mount.
> -or-
> /dev/ad0a =A0 =A0 =A0 -> 1st partition on disk ("dedicated")
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 THIS can also be mounted.
> -or-
> /dev/ad0 =A0 =A0 =A0 =A0-> the whole disk (equals /dev/ad0c)
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Even THIS can be mounted.
>
> In case I'm misunderstanding your question, could you alter the
> expression?
>
Thanks. The question was more advantages of a single slice + single
partition versus a slice and multiple partitions, for mounting the
EzJail basejail in RO mode.
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