Query on UBIFS usage

Query on UBIFS usage

[Ankur Maheshwari]

Hi all,

I am newbee to UBIFS. I have some basic doubts on using UBIFS.

1. I read in UBIFS FAQ that it can not be used as NFS file system. I
am bit confuse with the statement.
Is it possible that I use UBIFS on one of Flash partition and at the
same time do NFS (root fs mount as NFS) boot. Is there any issue with
it.

2. Can I use UBIFS with other Flash filesystem (like SquashFS-read
only) on other partition of same flash.

3. What will be better, keep using SquashFS(RO) or switch to UBIFS.

Thanks in advance.

-ANM

Re: Query on UBIFS usage

[Geert Uytterhoeven]

On Thu, 20 Nov 2008, Ankur Maheshwari wrote:
> I am newbee to UBIFS. I have some basic doubts on using UBIFS.
> 
> 1. I read in UBIFS FAQ that it can not be used as NFS file system. I
> am bit confuse with the statement.
> Is it possible that I use UBIFS on one of Flash partition and at the
> same time do NFS (root fs mount as NFS) boot. Is there any issue with
> it.

It means you cannot _export_ through NFS an UBIFS file system. I.e. if your
system serves data through NFS, that data cannot be located (yet?) on an UBIFS
file system.

> 2. Can I use UBIFS with other Flash filesystem (like SquashFS-read
> only) on other partition of same flash.

Should work.

> 3. What will be better, keep using SquashFS(RO) or switch to UBIFS.

It depends on your application.
If you need to write to the file system, you cannot use SquashFS.
If you just need a read-only file system, I expect SquashFS to be the better
choise, as it should compress better. But performance may still differ, anyone
with actual figures?

With kind regards,

Geert Uytterhoeven
Software Architect

Sony Techsoft Centre Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium

Phone:    +32 (0)2 700 8453
Fax:      +32 (0)2 700 8622
E-mail:   Geert.Uytterhoeven@sonycom.com
Internet: http://www.sony-europe.com/

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Re: Query on UBIFS usage

[Artem Bityutskiy]

On Thu, 2008-11-20 at 23:51 +0530, Ankur Maheshwari wrote:
> 1. I read in UBIFS FAQ that it can not be used as NFS file system. I
> am bit confuse with the statement.

You cannot export UBIFS via NFS so far, because we did not implement
NFS support inside UBIFS. In other words, UBIFS cannot be NFS server's
backing FS. But we are planning to implement this, we just do not have
time and do not need this.

> Is it possible that I use UBIFS on one of Flash partition and at the
> same time do NFS (root fs mount as NFS) boot. Is there any issue with
> it.

No, in this case you mount some other file system via NFS, co you are an
NFS client. It should be fine.

> 2. Can I use UBIFS with other Flash filesystem (like SquashFS-read
> only) on other partition of same flash.

Of course.

> 3. What will be better, keep using SquashFS(RO) or switch to UBIFS.

Everything depends on your needs/requirements/etc.

-- 
Best regards,
Artem Bityutskiy (Битюцкий Артём)