Re: Is ZFS ready for prime time?

2010-11-19 Thread Ivan Voras

On 11/15/10 21:06, Chris Rees wrote:

On 15 November 2010 19:59, Peter Boosten  wrote:


He's consistent in any case (a quick google search reveals this 2008
message):
http://www.mail-archive.com/freebsd-questions@freebsd.org/msg192926.html


Consistent, but still just spouting uninformed FUD.


Actually, I don't see anything incorrect in the above archive post.

As for specific problems with ZFS, I'm also pessimistic right now - it's 
enough to read the freebsd-fs @ freebsd.org and zfs-discuss @ 
opensolaris.org lists to see that there are frequent problems and 
outstanding issues. You can almost grep for people losing data on ZFS 
weekly. Compare this to the volume of complaints about UFS in both OSes 
(almost none).


ZFS is young and ambitiously designed. We'll see if it grows up.

As for FreeBSD's implementation, I think it will be "as good as it gets" 
in 9.0 if the import of ZFS v28 doesn't destabilize it. By this I mean 
that any problems left would not be FreeBSD's fault but ZFS's own fault.


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Re: Is ZFS ready for prime time?

2010-11-16 Thread Ivan Voras

On 11/16/10 20:23, Adam Vande More wrote:

On Tue, Nov 16, 2010 at 8:11 AM, Ivan Voras  wrote:


Actually, I don't see anything incorrect in the above archive post.



I do.  Cherry picking ZFS deficiencies without addressing the proper
documented way to work around them or at even acknowledging it's possible to
do so is FUD.  It's not like traditional RAID doesn't have it's own set of
gotcha's and proper usage environment.


Well, you are also doing cherry picking of *good* features so I'd say 
there's no conceptual difference here :)


NHF, I'm not attacking you; as with everything else, people need to test 
technologies they are going to use and decide if they are good enough.



Dismissing the value of checksumming your data seems foolhardy to say the
least.  The place where silent data corruption most frequently occurs, in
large archive type filesystems, also happens to be one of the prime usage
candidates of RAIDZ.


Now if only the default checksum wasn't so weak:

http://opensolaris.org/jive/thread.jspa?threadID=69655&tstart=30
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6740597

There are no details about its "fixed" status so I think the problem is 
still there.


(of course, stronger options are available, etc. - and it's better than 
nothing)



As for specific problems with ZFS, I'm also pessimistic right now - it's
enough to read the freebsd-fs @ freebsd.org and zfs-discuss @
opensolaris.org lists to see that there are frequent problems and
outstanding issues. You can almost grep for people losing data on ZFS
weekly. Compare this to the volume of complaints about UFS in both OSes
(almost none).



There are actually very few stories of ZFS/zpool loss on the FreeBSD
list(some are misidentifications of issues like this:
http://lists.freebsd.org/pipermail/freebsd-fs/2010-September/009417.html),
another source I would point you to is http://forums.freebsd.org/.  The
single recent valid one I can find involves a pool on geli, but I will grant
you that it happens at all is quite disconcerting.


Yes, especially since GELI is very sensitive to corruption.

But I'm also counting cases like the inability to replace a drive which 
failed, log device corruptions and similar things which will, if not 
result in a totally broken file system, result in a file system which is 
wedged in a way that requires it to be re-created.


In many of those, though, it's not clear if the error is in ZFS or FreeBSD.


UFS has it's own set of
issues/limitations so regardless of what you pick make sure you're aware of
them and take issues to address them before problems occur.


Of course, UFS *is* old and "classical" in its implementation - it would 
be just as wrong to expect fancy features from UFS like to expect such 
time-tested stability from ZFS.


And new technologies need time to settle down: there are still 
occasional reports of SUJ problems.


Personally, I have encountered only stability issues and currently have 
only one server with ZFS in production (reduction from several of them 
about a year ago), but I'm constantly testing it in staging. If the v28 
import doesn't destabilize it in 9, I'm going to give it another chance.



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RE: Is ZFS ready for prime time?

2010-11-16 Thread Gary Gatten


...
Actually I find the basics of its design pretty simple (cow/txg/zil)
and for that reason I think it is going to become very robust in the
near future, if it isn't already.

What is complex is the various journal and soft-updates code that
traditional file systems use.

But yes it has performance problems in some workloads and needs more
cpu/ram than usual.
...

All I know is the DOW is down almost 200 pts, so ZFS isn't a real priority for 
me right now.

Novell v4+ FS was / is the best ever - period!  If only they would make it OSS!

Gary

PS: Yes, I'm blowing on the flames...

-Original Message-
From: owner-freebsd-questi...@freebsd.org 
[mailto:owner-freebsd-questi...@freebsd.org] On Behalf Of App Deb
Sent: Tuesday, November 16, 2010 2:32 PM
To: Wojciech Puchar
Cc: freebsd-questions@freebsd.org; Modulok
Subject: Re: Is ZFS ready for prime time?

On Mon, Nov 15, 2010 at 10:28 AM, Wojciech Puchar
 wrote:

> no. ZFS is not usable and will never be usable for anything more than a toy.
> This is a result of that design.

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Re: Is ZFS ready for prime time?

2010-11-16 Thread App Deb
On Mon, Nov 15, 2010 at 10:28 AM, Wojciech Puchar
 wrote:

> no. ZFS is not usable and will never be usable for anything more than a toy.
> This is a result of that design.

Actually I find the basics of its design pretty simple (cow/txg/zil)
and for that reason I think it is going to become very robust in the
near future, if it isn't already.

What is complex is the various journal and soft-updates code that
traditional file systems use.

But yes it has performance problems in some workloads and needs more
cpu/ram than usual.
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Re: Is ZFS ready for prime time?

2010-11-16 Thread Adam Vande More
On Tue, Nov 16, 2010 at 8:11 AM, Ivan Voras  wrote:

> Actually, I don't see anything incorrect in the above archive post.
>

I do.  Cherry picking ZFS deficiencies without addressing the proper
documented way to work around them or at even acknowledging it's possible to
do so is FUD.  It's not like traditional RAID doesn't have it's own set of
gotcha's and proper usage environment.

Dismissing the value of checksumming your data seems foolhardy to say the
least.  The place where silent data corruption most frequently occurs, in
large archive type filesystems, also happens to be one of the prime usage
candidates of RAIDZ.


>
> As for specific problems with ZFS, I'm also pessimistic right now - it's
> enough to read the freebsd-fs @ freebsd.org and zfs-discuss @
> opensolaris.org lists to see that there are frequent problems and
> outstanding issues. You can almost grep for people losing data on ZFS
> weekly. Compare this to the volume of complaints about UFS in both OSes
> (almost none).
>

There are actually very few stories of ZFS/zpool loss on the FreeBSD
list(some are misidentifications of issues like this:
http://lists.freebsd.org/pipermail/freebsd-fs/2010-September/009417.html),
another source I would point you to is http://forums.freebsd.org/.  The
single recent valid one I can find involves a pool on geli, but I will grant
you that it happens at all is quite disconcerting.

There have been a lot of other ZFS issues ranging from performance, NFS
troubles, quirks on storage controllers not present when using UFS, to other
as-yet unexplained oddities.  Many of these are corner cases, and I think
they have mostly been resolved.  If you've happened to encouter one, I'm
sure it's left a sour taste though.  UFS has it's own set of
issues/limitations so regardless of what you pick make sure you're aware of
them and take issues to address them before problems occur.

-- 
Adam Vande More
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Re: Is ZFS ready for prime time?

2010-11-15 Thread David Brodbeck
One problem I ran into is that the file sharing technologies in
FreeBSD have not kept up; I consider NFSv4 a requirement for sanely
sharing ZFS over a network, and FreeBSD's NFSv4 server is still under
heavy development and not yet production-ready.  That may not matter
for a backup server, though.
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Re: Is ZFS ready for prime time?

2010-11-15 Thread Matthew Seaman
On 15/11/2010 20:33, krad wrote:
> My gut feeling is no. I wouldn't put it on mission critical stuff yet. Its
> not that I have had any major bad experiences (x fingers) but im not aware
> of any major deployments of it in the wild. As a result I wouldnt feel safe
> being the 1st 8)
> 
> What I would advise is to think carefully about what you actually need. If
> you dont really need zfs features, then fine go with ufs, as you can always
> migrate in the future. However if the features are useful to you and of
> enough of a benefit to justify I would advise going for a Solaris platform
> of some kind.
> 
> If you are doing it on a budget, go for openindiana, but if you have a some
> budget, go for the safe option of solaris 10 u9.
> 

I don't entirely agree with this.  ZFS on FreeBSD is in good shape and
suitable for /some/ mission critical uses IMHO.   You will gain all the
benefits of reliability, maintainability and flexibility that ZFS provides.

However:

   * The versions of ZFS in RELEASE versions of FreeBSD aren't
 brilliantly performant:  you want recent 8.1-STABLE or above
 if your need is for speed.

   * FreeBSD itself doesn't have good support for being an iSCSI
 provider, consequently the iSCSI related functions in ZFS are
 not enabled.  Similarly SCSI-target mode is in need of a bit of
 love, and trying to use FreeBSD as a homebrew SAN over fibre
 channel doesn't really work.

   * ZFS (on any platform) is intrinsically slow for the sort of small
 random IOs generated by RDBMSes.  On the other hand, the data
 integrity and update consistency guarantees are really good news
 if your Database needs stability and correctness more than speed.

   * The file synch-ing guarantees provided by ZFS are entirely
 dependent on the behaviour of the underlying hardware -- if your
 disk lies to the OS about having committed data to non-volatile
 storage then nothing can really be promised.  Or, looked at from a
 different point of view: ZFS cannot make a silk purse out of a
 sow's ear: it works most effectively with server-grade SATA or SAS
 drives rather than commodity desktop hard drives.

Personally, I've converted to using a ZFS mirror pair of drives for
preference as my standard way to do a FreeBSD OS install for a general
purpose server.  Exceptions are mostly due to speed requirements.  Once
8.2-RELEASE hits the  shelves in January (well, approximately January)
ZFS performance in RELEASE will be seen to have improved markedly, and I
expect to be using ZFS pretty much exclusively for general purpose installs.

On the other hand, if you need to build some sort of network file
server,  then OpenIndiana or Solaris would be better choices with ZFS,
and are likely to remain better for some significant amount of time.

Cheers,

Matthew

-- 
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  Flat 3
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Re: Is ZFS ready for prime time?

2010-11-15 Thread krad
On 15 November 2010 20:42, Adam Vande More  wrote:

> On Mon, Nov 15, 2010 at 2:10 PM, Devin Teske  wrote:
>
>> Sounds like FUD.
>>
>> Like the OP, I too am interested in the current state of ZFS. We've been
>> following the threads as far as build 28, and I do indeed see positive
>> improvement and continued development. However, is anyone that is
>> actively involved in the project able to provide a snapshot opinion of
>> the production readiness of ZFS for enterprise deployment?
>>
>> If the opinion is that ZFS is not ready for production, are there any
>> technical explanations as to the efficacy or lack thereof rather than
>> the above philosophical FUD which implores the OP to pour over massive
>> archives (which can paint an inverse picture because the archives are
>> usually filled with a higher number of issues than success stories --
>> which is true of nearly ANY mailing-list)?
>>
>
> You'll need to go over to freebsd-fs@ if you want a technical discussion.
> All you'll get here is meaningless opinionated philosophical gibber with
> little to no basis in reality.
>
>
>
> --
> Adam Vande More
>

 true, but well all know that politics influence our jobs and lives far more
than the absolute truth, so you cant just ignore it unfortunately. You get a
failure of some kind, then some clueless suit does some googling, puts 1 and
2 together and comes up with 7, and suddenly your in a hard place justifying
your choices.
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Re: Is ZFS ready for prime time?

2010-11-15 Thread Adam Vande More
On Mon, Nov 15, 2010 at 2:10 PM, Devin Teske  wrote:

> Sounds like FUD.
>
> Like the OP, I too am interested in the current state of ZFS. We've been
> following the threads as far as build 28, and I do indeed see positive
> improvement and continued development. However, is anyone that is
> actively involved in the project able to provide a snapshot opinion of
> the production readiness of ZFS for enterprise deployment?
>
> If the opinion is that ZFS is not ready for production, are there any
> technical explanations as to the efficacy or lack thereof rather than
> the above philosophical FUD which implores the OP to pour over massive
> archives (which can paint an inverse picture because the archives are
> usually filled with a higher number of issues than success stories --
> which is true of nearly ANY mailing-list)?
>

You'll need to go over to freebsd-fs@ if you want a technical discussion.
All you'll get here is meaningless opinionated philosophical gibber with
little to no basis in reality.



-- 
Adam Vande More
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Re: Is ZFS ready for prime time?

2010-11-15 Thread krad
On 15 November 2010 20:10, Devin Teske  wrote:

> On Mon, 2010-11-15 at 20:33 +0100, Wojciech Puchar wrote:
> > >>
> > >> ___
> > >> freebsd-questions@freebsd.org mailing list
> > >> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
> > >> To unsubscribe, send any mail to "
> > >> freebsd-questions-unsubscr...@freebsd.org"
> > >>
> > >
> > >
> > > please elaborate
> > look at archives. i really don't want to repeat the same many times.
> > And anyone that actually have clue about what is computer, disk drive,
> > reliability and algorithms and can think - after reading how ZFS is
> > designed will understand that.
> >
>
> Sounds like FUD.
>
> Like the OP, I too am interested in the current state of ZFS. We've been
> following the threads as far as build 28, and I do indeed see positive
> improvement and continued development. However, is anyone that is
> actively involved in the project able to provide a snapshot opinion of
> the production readiness of ZFS for enterprise deployment?
>
> If the opinion is that ZFS is not ready for production, are there any
> technical explanations as to the efficacy or lack thereof rather than
> the above philosophical FUD which implores the OP to pour over massive
> archives (which can paint an inverse picture because the archives are
> usually filled with a higher number of issues than success stories --
> which is true of nearly ANY mailing-list)?
> --
> Cheers,
> Devin Teske
>
> -> CONTACT INFORMATION <-
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> FIS - fisglobal.com
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My gut feeling is no. I wouldn't put it on mission critical stuff yet. Its
not that I have had any major bad experiences (x fingers) but im not aware
of any major deployments of it in the wild. As a result I wouldnt feel safe
being the 1st 8)

What I would advise is to think carefully about what you actually need. If
you dont really need zfs features, then fine go with ufs, as you can always
migrate in the future. However if the features are useful to you and of
enough of a benefit to justify I would advise going for a Solaris platform
of some kind.

If you are doing it on a budget, go for openindiana, but if you have a some
budget, go for the safe option of solaris 10 u9.

It all really depends on your particular circumstances.

A few tips

put the os on its own zpool and the data on its own. That way its fairly
easy to migrate to another os in the future.

go big on ram, the more the better

go for more cores rather than core speed, as zfs will benefit a lot from
more threads (it was designed to run on coolthread archs which have 128+
virt cpus). Also enable hyperthreading  if on intel

look at using ssd for l2arc if you need performance, or are using dedup
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Re: Is ZFS ready for prime time?

2010-11-15 Thread Peter Boosten

On 15 nov 2010, at 20:37, Chris Rees wrote:

> On 15 November 2010 19:33, Wojciech Puchar  wrote:
 
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>>> 
>>> 
>>> please elaborate
>> 
>> look at archives. i really don't want to repeat the same many times.
>> And anyone that actually have clue about what is computer, disk drive,
>> reliability and algorithms and can think - after reading how ZFS is designed
>> will understand that.
> 
> When did you ever 'repeat' that in the first place? Can you provide a
> link, I don't recall seeing anyone say that ZFS is a toy.

He's consistent in any case (a quick google search reveals this 2008 message): 

http://www.mail-archive.com/freebsd-questions@freebsd.org/msg192926.html

-- 
Peter Boosten
http://www.boosten.org



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Re: Is ZFS ready for prime time?

2010-11-15 Thread krad
On 15 November 2010 19:59, Peter Boosten  wrote:

>
> On 15 nov 2010, at 20:37, Chris Rees wrote:
>
> On 15 November 2010 19:33, Wojciech Puchar 
> wrote:
>
>
> ___
>
> freebsd-questions@freebsd.org mailing list
>
> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
>
> To unsubscribe, send any mail to "
>
> freebsd-questions-unsubscr...@freebsd.org"
>
>
>
>
> please elaborate
>
>
> look at archives. i really don't want to repeat the same many times.
>
> And anyone that actually have clue about what is computer, disk drive,
>
> reliability and algorithms and can think - after reading how ZFS is
> designed
>
> will understand that.
>
>
> When did you ever 'repeat' that in the first place? Can you provide a
> link, I don't recall seeing anyone say that ZFS is a toy.
>
>
> He's consistent in any case (a quick google search reveals this 2008
> message):
>
> http://www.mail-archive.com/freebsd-questions@freebsd.org/msg192926.html
>
> --
> Peter Boosten
> http://www.boosten.org
>
>
>
>
there may be some technical merits in his analysis. however  I have been
using zfs in production environments for a few years and know it scales very
well. Admittedly its in a solaris environment not BSD, but then he is on
about the  algorithms not the CPU architecture etc. In my experience the
performance is good on both intel and sparc enviroments. The more memory and
CPU the better as it is resource hungry. But then again it is doing a lot
more sophisticated stuff than plain old UFS. From an administration point of
view its very easy to use (especially compared to solstice and vinum) and
has a lot of cool features, that after a while you find yourself wondering
how you managed without them.

Having said all that, it remains on whether it will stay the course. I doubt
it will be around as long as ufs, as something better will come along in the
future I suspect (not convinced on btrfs yet), but one thing is for sure,
its set a new benchmark for filesystems
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Re: Is ZFS ready for prime time?

2010-11-15 Thread Chris Rees
On 15 November 2010 20:10, Devin Teske  wrote:
> On Mon, 2010-11-15 at 20:33 +0100, Wojciech Puchar wrote:
>> >>
>> >> ___
>> >> freebsd-questions@freebsd.org mailing list
>> >> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
>> >> To unsubscribe, send any mail to "
>> >> freebsd-questions-unsubscr...@freebsd.org"
>> >>
>> >
>> >
>> > please elaborate
>> look at archives. i really don't want to repeat the same many times.
>> And anyone that actually have clue about what is computer, disk drive,
>> reliability and algorithms and can think - after reading how ZFS is
>> designed will understand that.
>>
>
> Sounds like FUD.
>
> Like the OP, I too am interested in the current state of ZFS. We've been
> following the threads as far as build 28, and I do indeed see positive
> improvement and continued development. However, is anyone that is
> actively involved in the project able to provide a snapshot opinion of
> the production readiness of ZFS for enterprise deployment?
>
> If the opinion is that ZFS is not ready for production, are there any
> technical explanations as to the efficacy or lack thereof rather than
> the above philosophical FUD which implores the OP to pour over massive
> archives (which can paint an inverse picture because the archives are
> usually filled with a higher number of issues than success stories --
> which is true of nearly ANY mailing-list)?
> --
> Cheers,
> Devin Teske

I'm afraid that we can rely on Wojciech to constantly recommend that
you go back to using technology from 20 years ago, because keeping up
with anything current scares him, and he can't be bothered to research
anything properly, instead making sweeping statements about things he
knows little about.

Chris
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Re: Is ZFS ready for prime time?

2010-11-15 Thread Devin Teske
On Mon, 2010-11-15 at 20:33 +0100, Wojciech Puchar wrote:
> >>
> >> ___
> >> freebsd-questions@freebsd.org mailing list
> >> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
> >> To unsubscribe, send any mail to "
> >> freebsd-questions-unsubscr...@freebsd.org"
> >>
> >
> >
> > please elaborate
> look at archives. i really don't want to repeat the same many times.
> And anyone that actually have clue about what is computer, disk drive, 
> reliability and algorithms and can think - after reading how ZFS is 
> designed will understand that.
> 

Sounds like FUD.

Like the OP, I too am interested in the current state of ZFS. We've been
following the threads as far as build 28, and I do indeed see positive
improvement and continued development. However, is anyone that is
actively involved in the project able to provide a snapshot opinion of
the production readiness of ZFS for enterprise deployment?

If the opinion is that ZFS is not ready for production, are there any
technical explanations as to the efficacy or lack thereof rather than
the above philosophical FUD which implores the OP to pour over massive
archives (which can paint an inverse picture because the archives are
usually filled with a higher number of issues than success stories --
which is true of nearly ANY mailing-list)?
-- 
Cheers,
Devin Teske

-> CONTACT INFORMATION <-
Business Solutions Consultant II
FIS - fisglobal.com
510-735-5650 Mobile
510-621-2038 Office
510-621-2020 Office Fax
909-477-4578 Home/Fax
devin.te...@fisglobal.com

-> LEGAL DISCLAIMER <-
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M+ V- PS+ PE Y+ PGP- t(+) 5? X+(++) R>++ tv(+) b+(++) DI+(++) D(+) G+>++ e>+ h
r>++ y+ 
--END GEEK CODE BLOCK--
http://www.geekcode.com/

-> END TRANSMISSION <-

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Re: Is ZFS ready for prime time?

2010-11-15 Thread Chris Rees
On 15 November 2010 19:59, Peter Boosten  wrote:

> He's consistent in any case (a quick google search reveals this 2008
> message):
> http://www.mail-archive.com/freebsd-questions@freebsd.org/msg192926.html

Consistent, but still just spouting uninformed FUD.

Chris
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Re: Is ZFS ready for prime time?

2010-11-15 Thread Chris Rees
On 15 November 2010 19:33, Wojciech Puchar  wrote:
>>>
>>> ___
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>>
>>
>> please elaborate
>
> look at archives. i really don't want to repeat the same many times.
> And anyone that actually have clue about what is computer, disk drive,
> reliability and algorithms and can think - after reading how ZFS is designed
> will understand that.

When did you ever 'repeat' that in the first place? Can you provide a
link, I don't recall seeing anyone say that ZFS is a toy.

Chris
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Re: Is ZFS ready for prime time?

2010-11-15 Thread Wojciech Puchar


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please elaborate

look at archives. i really don't want to repeat the same many times.
And anyone that actually have clue about what is computer, disk drive, 
reliability and algorithms and can think - after reading how ZFS is 
designed will understand that.


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Re: Is ZFS ready for prime time?

2010-11-15 Thread krad
On 15 November 2010 08:28, Wojciech Puchar  wrote:

>
>> 1) Is ZFS as of 8.1 Release considered to be ready for mission critical?
>>
>
> no. ZFS is not usable and will never be usable for anything more than a
> toy. This is a result of that design.
>
> use UFS if you want something you can trust
>
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please elaborate
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Re: Is ZFS ready for prime time?

2010-11-15 Thread Wojciech Puchar


1) Is ZFS as of 8.1 Release considered to be ready for mission critical?


no. ZFS is not usable and will never be usable for anything more than a 
toy. This is a result of that design.


use UFS if you want something you can trust
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Is ZFS ready for prime time?

2010-11-14 Thread Modulok
List,

I'm ready to build a backup server and have two questions...

1) Is ZFS as of 8.1 Release considered to be ready for mission critical?
2) If I put ZFS on top of geli, will this, in any way, (other than
performance) impair ZFS's features? For example would stuff like the
ability to self heal and what not, still work? As I understand it, I
can just treat a geli like a generic block device, right?

Thanks!
-Modulok-
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