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From: Aniruddha on 27 Jul 2010 17:20
On Tue, Jul 27, 2010 at 11:06 PM, Aniruddha <mailingdotlist(a)gmail.com> wrote:
> On Tue, Jul 27, 2010 at 10:13 PM, Stan Hoeppner <stan(a)hardwarefreak.com> wrote:
>> Aniruddha put forth on 7/27/2010 2:47 PM:
>>> Time for some testing, I will put Debian stable with  XFS on my laptop and
>>> see how well it deals with power failures :)
>>
>> Thanks for picking up the torch/gauntlet/whatever.  How do you laptop test
>> this issue?  It's a laptop.  Yank the battery?  Yanking the wal-wart
>> (transformer) won't do diddly.
>
> I'll use it 'till runs out of battery. :)
>

Or even better, I'll use virtualbox to see what happens when I plug the power.


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From: Klistvud on 28 Jul 2010 05:00
Dne, 28. 07. 2010 03:53:43 je Paul E Condon napisal(a):
> Stan,
>
> Have you ever heard of the term 'invincible ignorance'?
>
>
> Also, you have asserted with some vigor upstream
>
>
> Your original post ... IMHO, was correct but somewhat harshly worded.

> Peace.

IMHO, Stan's deep, invaluable expertise is sometimes, regrettably,
undermined by his own "vigor" and "harshly worded" attitudes; some
people may be put off by his dismissive tone. I know I am. As is Volkan
Yazici, if we may judge from one of his replies to Stan:

> BTW, I still couldn't understand your temper and rudeness.

--
Peace.

Klistvud, one of the
> unwashed mass of invincibly ignorant people

Certifiable Loonix User #481801
http://bufferoverflow.tiddlyspot.com


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From: Aniruddha on 28 Jul 2010 08:50
I have done some testing with Debian stable in Virtualbox and I have
to say XFS works as advertised. I did power off the virtual machine
several times when working in Gnome / copying files. And I did power
off the virtual 5 times in a row when booting. Nothing happened. Each
time the virtual machine booted without problems.

I have to say, file system creating and file system checking is
lightning fast. I am very impressed. Next I'll test XFS on my laptop.


dmesg
-----------------------------------------------------------------------------------------------------------------------------------
[ 5.182230] sda: sda1 sda2
[ 5.183801] sd 0:0:0:0: [sda] Attached SCSI disk
[ 5.324028] PM: Starting manual resume from disk
[ 5.333377] SGI XFS with ACLs, security attributes, realtime, large
block numbers, no debug enabled
[ 5.334413] SGI XFS Quota Management subsystem
[ 5.335916] XFS mounting filesystem sda2
[ 5.420162] Starting XFS recovery on filesystem: sda2 (logdev: internal)
[ 5.439531] Ending XFS recovery on filesystem: sda2 (logdev: internal)
[ 6.796197] udevd version 125 started
------------------------------------------------------------------------------------------------------------------------------------


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From: Perry E. Metzger on 28 Jul 2010 15:20
On Wed, 28 Jul 2010 14:46:29 +0200 Aniruddha
<mailingdotlist(a)gmail.com> wrote:
> I have done some testing with Debian stable in Virtualbox and I have
> to say XFS works as advertised. I did power off the virtual machine
> several times when working in Gnome / copying files. And I did power
> off the virtual 5 times in a row when booting. Nothing happened.
> Each time the virtual machine booted without problems.
>
> I have to say, file system creating and file system checking is
> lightning fast. I am very impressed. Next I'll test XFS on my
> laptop.

Although I have no reason to believe that XFS is flawed, your test is
not proof of that.

Most journaling and similar bugs are found only in rare conditions.
You would need to conduct your test hundreds of thousands of times,
under a variety of conditions, including differing hardware cache
reorder policies, differing file system loads, differing numbers
of concurrent processes within the kernel code paths, etc.

Real torture tests done by people trying to nail down bugs often
involve millions of iterations in randomized test harnesses. Five
tests is hardly enough to find even common bugs.

If a test like the one you conducted were meaningful, the jobs of
systems programmers would be much simpler. We could just try
something a couple of times by hand and we would know if our code was
flawless. Sadly, the world does not work that way.

--
Perry E. Metzger perry(a)piermont.com


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From: Aniruddha on 28 Jul 2010 15:40
On Wed, Jul 28, 2010 at 9:09 PM, Perry E. Metzger <perry(a)piermont.com> wrote:
> On Wed, 28 Jul 2010 14:46:29 +0200 Aniruddha
> <mailingdotlist(a)gmail.com> wrote:
>> I have done some testing with Debian stable in Virtualbox and I have
>> to say XFS works as advertised. I did power off the virtual machine
>> several times when working in Gnome / copying files. And I did power
>> off the virtual 5 times in a row when booting. Nothing happened.
>> Each time the virtual machine booted without problems.
>>
>> I have to say, file system creating and file system checking is
>> lightning fast. I am very impressed. Next I'll test XFS on my
>> laptop.
>
> Although I have no reason to believe that XFS is flawed, your test is
> not proof of that.

Agreed, it was hardly a double-blind randomized trial :) On a more
serious note: off course these tests don't prove anything. On the
other hand I have heard so many time that XFS can't handle a single
power failure without data corruption that I wanted to see for myself
what happens if you power off a pc. with an XFS filesystem. Apparently
not much. There might other problems hidden with XFS,just like ext3 (
when copy pasting a home directory to another location I once lost the
whole directory due data corruption on ext3).


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