-----Original Message----- From: Lars Ellenberg [mailto:Lars.Ellenberg@linbit.com] Sent: Wednesday, September 21, 2005 8:58 AM To: linux-lvm@redhat.com Subject: Re: Directly using a logical volume / 2005-09-20 16:14:25 -0400 \ Allen, Jack: > I have a system connected to a SAN via Fibre Channel interface. > The system sees 3 disk sdb, sdc and sdd. I put them in a volume group > and then allocated some logical volumes. If I use the logical volume to > read and write to directly for my application, if there is an error on a > write, I assume the write system call will return an error. Or does the > write give a good return value after putting the data in some system > buffer to be written later? Then is the write of the system buffer fails > later, my program would not know. not exactly a linux-lvm question, is it? man 2 write man 2 fsync man 3 open (O_SYNC) -- : Lars Ellenberg Tel +43-1-8178292-0 : : LINBIT Information Technologies GmbH Fax +43-1-8178292-82 : : Schoenbrunner Str. 244, A-1120 Vienna/Europe http://www.linbit.com : _______________________________________________ I have read the man pages and that would be "man 2 open". The O_SYNC seems to only work for a regular file not a block device as the logical volume is. This was part of the reason for my questions. On UNIX systems we use the character device name and the O_SYNC does what you think it would there. I know this is Linux and some things are different. Again the reason for my questions. And yes it could be a linux-lvm question if the block device presented by LVM works differently than a true SCSI block device. Again the reason for the questions. Thanks: Jack Allen _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
