Slow performance read/write on iSCSI SAN.

This is a new configuration of ESXi 4.0 running virtual machines off a Cybernetics miSAN D iSCSI SAN.

Having a high data read the test on a virtual machine, it took 8 minutes vs 1.5 minutes the

the same VM on a slower 1.0 Server of VMWare host with virtual computers on

local disk.   I look at my reading speed of the SAN, and

It's getting a little more than 3 MB/s max in reading, and usage of the disk on the virtual computer is slower 3MB/s...horribly.

The SAN and the server is both connected to the same switch 1 GB.  I followed this guide

virtualgeek.typepad.com/virtual_geek/2009/09/a-multivendor-post-on-using-iSCSI-w

ITH-vmware - vsphere.html

to get the configuration of multiple paths correctly, but I still do not get good

performance with my VM.   I know that the SAN and network

must be able to handle more than 100 MB/s, but I am not getting

it. I have two network cards of GB on the multipath SAN to GB two network cards on the

ESXi host.  One NETWORK card per VMkernel.  Is there anything else I can check

or do to improve my speed?  Thanks in advance for advice.

Another vote for IOMeter.

Try to test 32K 100% sequential read (and write) with 64 IOs in circulation, this will give sequential performance.  Should be close to 100 Mbps per active path of GigE, depending on how much the storage system can get out.

Then 32K 0% sequential read (and write) with 64 traffic against a LUN will IOs (say 4 GB +) good test size give a value for IOPS, which is the main factor for virtualization.  Look at the latency, must remain below approximately 50ms usually in order to be able to work if the default 32 IOs in circulation (by host) is OK (say you had six hosts, the table should be able to deliver the random i/o with a latency)<50ms with="" 192="" outstanding="" ios="" (="">

Do not use the "test connect rate" and cela effectively tests only cached flow, which we are not so interested in any case.

Please give points for any helpful answer.

Tags: VMware

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-> s  - second
-> cs - centisecond -     100th of a second
-> ms - millisecond -    1000th of a second
-> us - microsecond - 1000000th of a second
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process startup                        46          0          2     39      0.0
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log file single write                 160          0          0      2      0.0
PX Deq: Table Q qref                   62          0          0      4      0.0
control file sequential read        4,336          0          0      0      0.7
direct path read                   45,818          0          0      0      7.7
library cache lock                      1          0          0     76      0.0
direct path write                  22,821          0          0      0      3.8
LGWR wait for redo copy             5,387          0          0      0      0.9
PX Deq Credit: need buffer            206          0          0      0      0.0
undo segment extension             40,035     40,028          0      0      6.7
db file parallel write              3,904          0          0      0      0.7
db file single write                   40          0          0      0      0.0
log file sequential read              160          0          0      0      0.0
async disk IO                          40          0          0      0      0.0
SQL*Net message from client       269,626          0    337,613   1252     45.1
pipe get                            5,313      5,286     21,063   3964      0.9
queue messages                      1,466      1,464     14,023   9566      0.2
wakeup time manager                   239        238      6,738  28191      0.0
PX Idle Wait                        3,475      3,042      6,026   1734      0.6
jobq slave wait                       961        960      2,824   2939      0.2
PX Deq: Execution Msg               9,423          1        159     17      1.6
PX Deq: Table Q Normal              1,362          4          8      6      0.2
SQL*Net more data from clien       12,643          0          2      0      2.1
SQL*Net message to client         269,616          0          0      0     45.1
^LWait Events for DB: OAPROD  Instance: OAPROD  Snaps: 551 -553
-> s  - second
-> cs - centisecond -     100th of a second
-> ms - millisecond -    1000th of a second
-> us - microsecond - 1000000th of a second
-> ordered by wait time desc, waits desc (idle events last)

                                                                   Avg
                                                     Total Wait   wait    Waits
Event                               Waits   Timeouts   Time (s)   (ms)     /txn
---------------------------- ------------ ---------- ---------- ------ --------
          -------------------------------------------------------------
^LBackground Wait Events for DB: OAPROD  Instance: OAPROD  Snaps: 551 -553
-> ordered by wait time desc, waits desc (idle events last)

                                                                   Avg
                                                     Total Wait   wait    Waits
Event                               Waits   Timeouts   Time (s)   (ms)     /txn
---------------------------- ------------ ---------- ---------- ------ --------
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LGWR wait for redo copy             5,387          0          0      0      0.9
db file parallel write              3,904          0          0      0      0.7
direct path read                    1,833          0          0      0      0.3
direct path write                   1,833          0          0      0      0.3
log file sequential read              160          0          0      0      0.0
buffer busy waits                      21          0          0      0      0.0
rdbms ipc message                  41,753      9,476     33,069    792      7.0
pmon timer                          4,438      2,164      7,021   1582      0.7
smon timer                            522          1      6,820  13064      0.1
          -------------------------------------------------------------
^LSQL ordered by Gets for DB: OAPROD  Instance: OAPROD  Snaps: 551 -553
-> End Buffer Gets Threshold:     10000
-> Note that resources reported for PL/SQL includes the resources used by
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--------------- ------------ -------------- ------ -------- --------- ----------
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