https://community.hpe.com/t5/operating-system-hp-ux/creating-additional-device-swap/m-p/2599051#M33918 Well if swap used it, and then a bad spot came along, and swap tried to reference that portion of disk that was bad, and the data was moved elsewhere, it wouldn't know where to go get it. Mon, 22 Oct 2001 18:17:21 GMT harry d brown jr 2001-10-22T18:17:21Z https://community.hpe.com/t5/operating-system-hp-ux/creating-additional-device-swap/m-p/2599047#M33914 My question comes when creating the logical volume. Can you please explain to me why I want to turn bad block allocation off for device swap? From my current understanding, you can leave it on for device swap that will be used as reserve swap. Maybe I dont fully understand bad block allocation. Thanks for any insight you can provide. Should I turn bad block allocation off when adding device swap?<BR /><BR />Brent Mon, 22 Oct 2001 18:01:47 GMT https://community.hpe.com/t5/operating-system-hp-ux/creating-additional-device-swap/m-p/2599047#M33914 Brent Hardesty 2001-10-22T18:01:47Z https://community.hpe.com/t5/operating-system-hp-ux/creating-additional-device-swap/m-p/2599048#M33915 because you really want swap to be contiguous. It will deal with bad spots itself, like through a kernel panic - just kidding. Mon, 22 Oct 2001 18:11:21 GMT https://community.hpe.com/t5/operating-system-hp-ux/creating-additional-device-swap/m-p/2599048#M33915 harry d brown jr 2001-10-22T18:11:21Z https://community.hpe.com/t5/operating-system-hp-ux/creating-additional-device-swap/m-p/2599049#M33916 Opps, Yes you should turn bad block allocation off for device swap. Of course, filesystem swap might be a better use of disk, depending upon the availablility - the more free disk = device swap, not enough disk = filesystem swap (of course with performance penalities). Mon, 22 Oct 2001 18:14:30 GMT https://community.hpe.com/t5/operating-system-hp-ux/creating-additional-device-swap/m-p/2599049#M33916 harry d brown jr 2001-10-22T18:14:30Z https://community.hpe.com/t5/operating-system-hp-ux/creating-additional-device-swap/m-p/2599050#M33917 One more question. What would be the outcome if you created device swap with bad block allocation turned on? Mon, 22 Oct 2001 18:14:44 GMT https://community.hpe.com/t5/operating-system-hp-ux/creating-additional-device-swap/m-p/2599050#M33917 Brent Hardesty 2001-10-22T18:14:44Z https://community.hpe.com/t5/operating-system-hp-ux/creating-additional-device-swap/m-p/2599051#M33918 Well if swap used it, and then a bad spot came along, and swap tried to reference that portion of disk that was bad, and the data was moved elsewhere, it wouldn't know where to go get it. Mon, 22 Oct 2001 18:17:21 GMT https://community.hpe.com/t5/operating-system-hp-ux/creating-additional-device-swap/m-p/2599051#M33918 harry d brown jr 2001-10-22T18:17:21Z https://community.hpe.com/t5/operating-system-hp-ux/creating-additional-device-swap/m-p/2599052#M33919 Simple enough!!!! <BR /><BR />Thx for the time and help!<BR /><BR />Brent Mon, 22 Oct 2001 18:19:39 GMT https://community.hpe.com/t5/operating-system-hp-ux/creating-additional-device-swap/m-p/2599052#M33919 Brent Hardesty 2001-10-22T18:19:39Z https://community.hpe.com/t5/operating-system-hp-ux/creating-additional-device-swap/m-p/2599053#M33920 If you turn on bad block relocation, then the LVM will allot special storage at the end of the disk to handle bad blocks. swap should be contiguous. So,with bad block relocation on, disk errors may confuse paging activity which may result serious problems like system hanging, crash etc.,<BR /><BR />-Sri Mon, 22 Oct 2001 18:25:19 GMT https://community.hpe.com/t5/operating-system-hp-ux/creating-additional-device-swap/m-p/2599053#M33920 Sridhar Bhaskarla 2001-10-22T18:25:19Z