Hello Doug, * Douglas Gilbert <dgilbert@xxxxxxxxxxxx> [2013-10-07 00:58]: > Great, another one working. yes. :-) > So this saniq/HP/lefthand system does not support fetching > the xcopy operating parameters, which will cause sg_xcopy > and ddpt to give up. These could be defaulted to something > sane and then use those default values to attempt the > command that actually does the work: EXTENDED_COPY(LID1). > Googled around and couldn't find any workflow for this (for > the saniq product). Do you have any technical documentation > for this product that might throw some light on this? I don't have any technical documentation describing EXTENDED_COPY. However I know that it works with ESX server. So what I did is sniffing the SCSI commands. Find the pcap here: https://thomas.glanzmann.de/tmp/xcopy.pcap.bz2 (920K) https://thomas.glanzmann.de/tmp/onexcopy.pcap (4K) Hopefully that helps you figure out what is going on. My first though was that we were doing the 100 MB in 4 chunks. That means approx 25 MB per chunk (not precisely). However maybe that is to much for the SAN/IQ. Maybe we should go easy on it and try 4 MB or 16 MB chunks. I have configured the ESX to 16 MB chunks (the maximum ESX supports) using the following command: esxcfg-advcfg -s 16384 /DataMover/MaxHWTransferSize If you want access to the system using ssh, let me know. > Good. Now sg_xcopy and ddpt (my versions) output debug lines > like this: > /dev/sdh: LEFTHAND iSCSIDisk a500 [pdt=0, 3pc=1] perfect. > > Unit serial number: ca7e1e04bb286ee443fe05e985a11d240000000000000019 > Interesting serial number :-) no idea how they calculate it. > BTW list_id=0 has a special meaning in some context > (buried deep in T10 documents: spc4r36j.pdf). That is > probably why Hannes Reinecke defaulted that list_id to > 1. I could understand the target XCOPY implementation > only accepting one xcopy sequence at a time, but why > restrict it to list_id=0 ? A question for NaB ... Nab, do you have any input for us? Quick wrap up what we did so far: Doug asked me to test ddpt and sg_xcopy of sg3-utils beta on your target. After setting the list_id=0 both tools work out of the box. The test setup is: - 2 100 MB LUNs - Createing a filesystem on the first and copy some date on it - Use ddpt if=/dev/sg3 iflag=xcopy list_id=0 of=/dev/sg4 bs=512 sg_xcopy if=/dev/sdc of=/dev/sdd list_id=0 to copy the data from LUN 1 to LUN 2. And do a md5sum to verify that the user data are exactly the same. Cheers, Thomas -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
