hp9000 connect to hp eva3000 with two hsv100 through two hba and two san switch?

[xxl_1]

my problem is :
two hp9000(hp-ux 11.11) is connected to hp eva3000 with two hsv100 through two hba and two san switch,so can hp9000 switch different path by itself correspondent to a virtual array unit??

[Steven Clementi]

I am not at all familiar with HP-UX, but with most OS's... the multipath software automatically handles the switching of paths during a failure situation.

In Windows, Secure Path or MPIO automatically detect path failures and switch to the next available path.

In Linux, Secure Path or Qlogic Failover handle switching.

In HP-UX, Secure Path or some built-in OS multipath capabilities handle path switching. (or so I believe).


Steven

[Uwe Zessin]

xxl,
you do need Secure Path for the EVA3000 - PVlinks does not work. Watch out to install the correct Secure Path component - the 'autopath' one does not work with the 3000.

[xxl_1]

hi,now I can see a device name correspond to
a virual array unit,if it is not correct or
can't auto switch ?

thank you very much!

[Uwe Zessin]

Please be a bit more verbose - I don't understand that question.

[xxl_1]

on hp-ux os ,I can see:
disk 3 255/255/0/0.0 sdisk CLAIMED DEVICE HSV100 HP
/dev/dsk/c13t0d0 /dev/rdsk/c13t0d0
disk 4 255/255/0/0.1 sdisk CLAIMED DEVICE HSV100 HP
/dev/dsk/c13t0d1 /dev/rdsk/c13t0d1

but I use mulit-link,how it is correct?
other ,how i can see the link correspondent
to the 'c13t0d0' and 'c13t0d1'?

[Uwe Zessin]

# spmgr display

[xxl_1]

hi,Uwe Zessin :
I can see the same result on the two hp server:
Storage: 5000-1FE1-5003-1C00
Load Balance: Off Auto-restore: Off
Path Verify: On Verify Interval: 30
HBAs: td0 td1
Controller: P66C5E1AAPZ09U, Operational
P66C5E1AAPZ05B, Operational
Devices: c13t0d0 c13t0d1 c13t0d2 c13t0d3

TGT/LUN Device WWLUN_ID H/W_Path #_Paths
0/ 0 c13t0d0 6005-08B4-0001-3BFE-0000-A000-0045-0000 4
255/255/0/0.0
Controller Path_Instance HBA Preferred? Path_Status
P66C5E1AAPZ09U no
c5t0d1 td0 no Standby
c9t0d1 td1 no Standby

Controller Path_Instance HBA Preferred? Path_Status
P66C5E1AAPZ05B no
c7t0d1 td0 no Active
c11t0d1 td1 no Available

It seems the paths can't atuo-restore,but three status are activeã standbyã Available in the 'path_status' blank, is it correct?

[krusty]

I have posted a reply to a similiar issue in a prior thread. See

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=947298

for more detail.

BTW, HP-UX supports multiple paths to storage natively to the OS. Most other OSes are working towards this (MPIO, etc), but HP-UX has been doing this for over a decade (since v9.04, I believe). There is a lot a confusion about this issue, since there are a lot of folks working with other OS's that REQUIRE a multipathing software solution, they assume everyone needs it. Yes, HP-UX requires Secure Path for EVA GLs (3K, 5K series), but this is due to the active-passive controllers on the array, not the OS. The new XL series (4K,6K,8K) are active active controllers and do not require Secure Path. What Secure Path WILL buy you is load balancing. Sorry for coming off as a HP-UX snob, but I want to clarify some items here.)

Sincerely,

Curt