Hello. Sorry for writing to btrfs mailing list, but personal mail reject my message. Saying " <chris.mason@xxxxxxxxxxxx>: host 10.101.1.19[10.101.1.19] said: 554 5.4.6 Hop count exceeded - possible mail loop (in reply to end of DATA command) Final-Recipient: rfc822; chris.mason@xxxxxxxxxxxx Action: failed Status: 5.0.0 Diagnostic-Code: X-Spam-&-Virus-Firewall; host 10.101.1.19[10.101.1.19] said: 554 5.4.6 Hop count exceeded - possible mail loop (in reply to end of DATA command) " My question is: I'm try to see what happening when virtual machine write to disk and run blktrace from dom0 like this blktrace -w 60 -d /dev/disk/vbd/21-920 -o - > test.trace /dev/disk/vbd/21-920 is the software raid contains 2 lv volumes , each lv volume created in big srp attached disk Inside vm i try to do some work via fio: [global] rw=randread size=128m directory=/tmp ioengine=libaio iodepth=4 invalidate=1 direct=1 [bgwriter] rw=randwrite iodepth=32 [queryA] iodepth=1 ioengine=mmap direct=0 thinktime=3 [queryB] iodepth=1 ioengine=mmap direct=0 thinktime=5 [bgupdater] rw=randrw iodepth=16 thinktime=40 size=128m After that i try to get graph like iowatcher -t test.trace -o trace.svg But svg contains unreadable images. What i doing wrong and how can i fix that? svg looks like http://62.76.182.4/trace.svg Thank you for good tools ! -- Vasiliy Tolstov, e-mail: v.tolstov@xxxxxxxxx jabber: vase@xxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html