On 11-Mar-07, at 11:12 PM, Ayaz Anjum wrote:
HI !
Well as per my actual post, i created a zfs file as part of Sun
cluster HAStoragePlus, and then disconned the FC cable, since there
was no active IO hence the failure of disk was not detected, then i
touched a file in the zfs filesystem, and it went fine, only after
that when i did sync then the node panicked and zfs filesystem is
failed over to other node. On the othernode the file i touched is
not there in the same zfs file system hence i am saying that data
is lost. I am planning to deploy zfs in a production NFS
environment with above 2TB of Data where users are constantly
updating file. Hence my concerns about data integrity.
I believe Robert and Darren have offered sufficient explanations: You
cannot be assured of committed data unless you've sync'd it. You are
only risking data loss if your users and/or applications assume data
is committed without seeing a completed sync, which would be a design
error. This applies to any filesystem.
--Toby
Please explain.
thaks
Ayaz Anjum
Darren Dunham <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
03/12/2007 05:45 AM
To
zfs-discuss@opensolaris.org
cc
Subject
Re: Re[2]: [zfs-discuss] writes lost with zfs !
> I have some concerns here, from my experience in the past,
touching a
> file ( doing some IO ) will cause the ufs filesystem to failover,
unlike
> zfs where it did not ! Why the behaviour of zfs different than ufs ?
UFS always does synchronous metadata updates. So a 'touch' that
creates
a file is going to require a metadata write.
ZFS writes may not necessarily hit the disk until a transaction group
flush.
> is not this compromising data integrity ?
It should not. Is there a scenario that you are worried about?
--
Darren Dunham
[EMAIL PROTECTED]
Senior Technical Consultant TAOS http://
www.taos.com/
Got some Dr Pepper? San Francisco, CA bay
area
< This line left intentionally blank to confuse you. >
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