HI ! 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 ? is not this compromising data integrity ?
thanks Ayaz From: Robert Milkowski <[EMAIL PROTECTED]> Recipients: Manoj Joseph <[EMAIL PROTECTED]>, Ayaz Anjum <[EMAIL PROTECTED]>,zfs-discuss@opensolaris.org Subject: Re[2]: [zfs-discuss] writes lost with zfs ! Date: 03/08/2007 02:34:20 PM Hello Manoj, Thursday, March 8, 2007, 7:10:57 AM, you wrote: MJ> Ayaz Anjum wrote: >> 2. with zfs mounted on one cluster node, i created a file and keeps it >> updating every second, then i removed the fc cable, the writes are still >> continuing to the file system, after 10 seconds i have put back the fc >> cable and my writes continues, no failover of zfs happens. >> >> seems that all IO are going to some cache. Any suggestions on whts going >> wrong over here and whts the solution to this. MJ> I don't know for sure. But my guess is, if you do a fsync after the MJ> writes and wait for the fsync to complete, then you might get some MJ> action. fsync should fail. zfs could panic the node. If it does, you MJ> will see a failover. Exactly. Files must be open with O_DSYNC of fdsync should be used. If you don't then writes are expected to be buffered and later put to disks which in your case has to fail. If you want to guarantee that when your applications writes something it's on stable storage then use proper semantics like shown above. -- Best regards, Robert mailto:[EMAIL PROTECTED] http://milek.blogspot.com -------------------------------------------------------------------------------------------------- Confidentiality Notice : This e-mail and any attachments are confidential to the addressee and may also be privileged. If you are not the addressee of this e-mail, you may not copy, forward, disclose or otherwise use it in any way whatsoever. If you have received this e-mail by mistake, please e-mail the sender by replying to this message, and delete the original and any print out thereof.
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