Hello, I believe what you are looking for is known as "latency". The time from when an I/O is submitted until the acknowledgement is received.
Different OS's have different tools for monitoring this. Windows has PERFMON.EXE, or task manager. ESXi has built in Performance monitoring as well. I have not tried this myself, but looked interesting for various OS's. https://code.google.com/p/ioping/ ioping This tool lets you monitor I/O latency in real time. It shows disk latency in the same way as ping shows network latency. Usage: ioping [-LABCDWRq] [-c count] [-w deadline] [-pP period] [-i interval] [-s size] [-S wsize] [-o offset] directory|file|device ioping -h | -v -c <count> stop after <count> requests -w <deadline> stop after <deadline> -p <period> print raw statistics for every <period> requests -P <period> print raw statistics for every <period> in time -i <interval> interval between requests (1s) -s <size> request size (4k) -S <wsize> working set size (1m) -o <offset> working set offset (0) -k keep and reuse temporary working file -L use sequential operations (includes -s 256k) -A use asynchronous I/O -C use cached I/O -D use direct I/O -W use write I/O *DANGEROUS* -R seek rate test (same as -q -i 0 -w 3 -S 64m) -B print final statistics in raw format -q suppress human-readable output -h display this message and exit -v display version and exit On Mon, Oct 20, 2014 at 10:57 PM, Lei Xue <[email protected]> wrote: > Can you catch the network packets via tcpdump or wireshark? > You can use Wireshark to investigate them after you get the network data, > you will find the "time" field. > > Thanks, > -Lei > > 2014-10-21 10:44 GMT+08:00 木木夕 <[email protected]>: > >> Hey all, >> i build an iSCSI Enterprise Target, and use open-iscsi initiator to >> login,which works well. >> now i want to know the response time of the target, where can i get that? >> or in which function should i add something in IET to calculate the >> response time ? >> for example: >> one read request comes to target from initiator ,then the target accepts >> that and returns a response to initiator. can i get the time from request >> to response? >> any answer will be appreciated, thank you! >> best regards! >> >> -- >> You received this message because you are subscribed to the Google Groups >> "open-iscsi" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at http://groups.google.com/group/open-iscsi. >> For more options, visit https://groups.google.com/d/optout. >> > > -- > You received this message because you are subscribed to the Google Groups > "open-iscsi" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/open-iscsi. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/open-iscsi. For more options, visit https://groups.google.com/d/optout.
