barrier refers to barrier writes. I have no idea what it means to hardware, but when Linux on z tries to do barrier writes to SCSI disk on a shark with multipathing, it fails. ( at least, with current code it does )
basically it means when you mount multipathed SCSI devices, you have to mount it with the barrier function off - like so: (reiserfs) mount /dev/evms/amultipathvol /mnt -o barrier=none (ext3) mount /dev/evms/amultipathvol /mnt -o barrier=0 Or something like that. It may even apply to non-multipathed scsi devices, but I've never checked it there. Jay Brenneman Linux Test and Integration Center T/L: 295 - 7745 Extern: 845 - 435 - 7745 [EMAIL PROTECTED] Jim Sibley <[EMAIL PROTECTED]> Sent by: Linux on 390 Port <[EMAIL PROTECTED]> 07/15/04 04:28 PM Please respond to Linux on 390 Port To [EMAIL PROTECTED] cc Subject MD-dev and barrier I have some doc that refers to "MD devices" and boot option "barrier". What devices do they mean and what does barrier do? ===== Jim Sibley "Computers are useless.They can only give answers." Pablo Picasso (The NSHO's expressed here represents no-one but myself). __________________________________ Do you Yahoo!? Yahoo! Mail is new and improved - Check it out! http://promotions.yahoo.com/new_mail ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
