Ayaz,
What does the panic stack look like ?
Did you have DPM (Disk Path Monitoring) enabled in both the cases
(UFS/ZFS) ?
Also, from what I have seen pulling the FC cable (or similar fault) to
simulate disk fault has caused
ZFS to hang or panic.
I don't think such a test is the right way to test disk failures.
Experts, please correct me here if needed.
Thanks and regards,
Sanjeev.
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. 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
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