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05-30-2006 07:34 AM
05-30-2006 07:34 AM
We are scheduled to upgrade the hardware and we have been lookin at the Integrity Servers to replace the current PA Servers. Can VP Links replace Secure Path? Do you know if PV Links work with VxVm 4.1 or VxVm 3.5? I looked for a compatibility matrix but it did not list these products. I have heard that on HP-UX 11.23 w/ 2 HBA cards connecting to a EVA 4000, you could use PV links to replace using Secure Path. We plan on still running MCSG w/ 2 node cluster and Veritas Replication to a DRP site.
Does anyone know where I can find info on the PVlinks for HPUX 11.11 or HPUX 11.23?
Does anyone have a similar setup? Any pros or cons? Any information would be helpful.
Thanks
Leslie
Solved! Go to Solution.
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05-30-2006 08:07 AM
05-30-2006 08:07 AM
Re: PV Links vs Secure Path
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00248530/c00248530.pdf?jumpid=reg_R1002_USEN
PV links is not a software, it is LVM functionality. You just tell LVM the different ways to one disk and LVM is switching to the next path if the first becomes unavailable. AFAIK Secure path is needed for Active/Passice arrays and can enhance LVM configurations with load sharing and some more, if the hardware can do this.
IMHO, secure path can replace or better enhance pv links, but not vice versa.
Hope this helps!
Regards
Torsten.
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05-30-2006 08:10 AM
05-30-2006 08:10 AM
Re: PV Links vs Secure Path
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05-30-2006 12:37 PM
05-30-2006 12:37 PM
Re: PV Links vs Secure Path
But as someone mentioned be careful with 1st generation EVAs as PV Links won't work with active-passive arrays. Another thing, under PV Links you're on your own if you want to identify your devices and order them in LVM. You end up with 8 paths for each vdisk in ioscan so you have to be careful. SecurePath makes this easier by grouping the disks and identifying them by their wwn.
I think that there is a better path failover solution that is planned for a future release of HP-UX. This will make SecurePath redundant.
Olivier
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05-30-2006 06:37 PM
05-30-2006 06:37 PM
Re: PV Links vs Secure Path
interconnect hardware (cables, switches, and connectivity devices) as single
points of failure in the storage system.
By using redundant hardware and advanced RAID technology, Secure Path
enhances fault tolerance and storage system availability by providing automated
failover capability.
Redundant physical connections define separate paths in a Secure Path hardware
configuration. Each path originates at a unique HBA port on a server and ends at a
unique RAID controller port in the storage system.
The Secure Path software detects the failure of I/O operations on a failed path and
automatically re-routes traffic to other available paths. Secure Path software
gathers alternate paths through available SAN switches, controllers, controller
ports, and HBAs. Path failover is completed seamlessly, without process
disruption or data loss.
PVLinks is part of LVM functionality as explained above.
-Amit
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05-30-2006 07:13 PM
05-30-2006 07:13 PM
SolutionRegarding your queries..
a) PV links work with LVM only..it comes by default..you add alternate paths using the vgextend command.. LVM determines that it is pointing to the same disk/lun and adds it as an alternate path (called PV links)...it does not interact with VxVM..
b) EVA 3k has 2 host ports on each controller and depending on the SAN connection... you would see multiple paths for the same LUN. Secure Path is used to mask these multiple paths and provide only 1 path to the OS thereby easing administration. Since there is no Array support library for the EVa3k/5k...VxVM has no way to determine that they are multiple paths to the same LUN, thinks that each path is a separate device and acts accordingly .. which makes things difficult for the sysadmin..
c)EVA4k is the next generation of EVA storages and does not require secure path to mask the mulitple paths for the luns...the controller takes care of it now, hence you dont require to purchase securepath for eva4k,6k,8k..
regards
albert
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05-31-2006 02:37 AM
05-31-2006 02:37 AM
Re: PV Links vs Secure Path
Peace.
My advice to you is to simply drop LVM from the picture and use VxVM entirely -- even for your boot disks. This way you can drop SecurePath from the picture as your older EVA3000 can be upgraded to a new Firmware so it no longer requires SecurePath.
What will you be using then as path protection (which PVLinks and SecurePath do)? -- DMP. VxVM's DMP (dynamic multi-pathing) will now be your path protection and load balancing. It will fit nicely with the other Veritas solutions you now have and MCSG works perfectly with it. Also - did you know that you will no longer have to be worried about HW path (cXtYdZ) changes with VxVM?
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01-18-2008 10:55 AM
01-18-2008 10:55 AM
Re: PV Links vs Secure Path
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01-18-2008 04:14 PM
01-18-2008 04:14 PM
Re: PV Links vs Secure Path
Peace.
So with this EVA6000 -- did you also went traight to Integrity Itanic Servers and HP-UX 11.31?
Are you still using VxVM? and still doing replication?
In your orginal post - you mentioned "Veritas Replication to a DRP site. "
Can you please expound on this if you don't mind? Are you using VVR (Veritas Volume Replication"? What's the size of your database(s?) and what's the bandwidth of your dark fibre or network between your main site and your DRP site?
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01-22-2008 02:23 PM
01-22-2008 02:23 PM
Re: PV Links vs Secure Path
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01-22-2008 02:35 PM
01-22-2008 02:35 PM
Re: PV Links vs Secure Path
Muchas Gracias for the Info.
We're exactly the same boat. Stuck with PA8800/8900 CPUs and 11.11 and using EVA XL as well as XP.
We'll probably be able to get better than T3 (i.e OC3) bandwidth and I am in preliminary studies whether software based (VVR) will have advantages over array based replication (Continous Access or Hitachi Hi-Copy?).
What made you to stick with VVR instead of Continous Access perhaps? Do you find VVR pretty robust?
I'll really appreciate whatever info you can share man..
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01-22-2008 02:38 PM
01-22-2008 02:38 PM
Re: PV Links vs Secure Path
BTW our databases are quite large... 400 GB to 3.2 TB. We're sil studying possible deltas (bits/blocks) -- any tool you've used in the past to assess?
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01-22-2008 02:38 PM
01-22-2008 02:38 PM
Re: PV Links vs Secure Path
BTW our databases are quite large... 400 GB to 3.2 TB. We're sil studying possible deltas (bits/blocks) -- any tool you've used in the past to assess?
Favourite Toy:
AMD Athlon II X6 1090T 6-core, 16GB RAM, 12TB ZFS RAIDZ-2 Storage. Linux Centos 5.6 running KVM Hypervisor. Virtual Machines: Ubuntu, Mint, Solaris 10, Windows 7 Professional, Windows XP Pro, Windows Server 2008R2, DOS 6.22, OpenFiler
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01-22-2008 03:07 PM
01-22-2008 03:07 PM
Re: PV Links vs Secure Path
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01-23-2008 10:33 AM
01-23-2008 10:33 AM
Re: PV Links vs Secure Path
"http://www.apparentnetworks.com/sas/280/"
NetFlow Analyer 5
Leslie