Hi,
No whitepapers or the like, just experience: we are running a
RS/6k with 4 HBA's with mixed disk and tape.
Each ESS disk runs through each HBA (e.g. each vpath has 4
hdisks). Each HBA also runs 2 LTO-1 drives from a 3584 library.

This  setup is running for over 4 years now without any problems
(the last two year TSM is involved. The RS/6k now uses the LTO
drives through the LANfree option whereas befoer we use some local
backup mechanism).

-Marcel

On Thu, Apr 29, 2004 at 01:32:45PM +0200, Daniel Sparrman wrote:
> Hi Bill
>
> Just check out the readme-files that comes with the patch/maintenance
> package. It clearly states that Tivoli recommends connecting the tape
> drives on separate adapters from the disk.
>
> >From the readme-file of the TSM StorageAgent for SUN v5.2.1.3
> (ftp://ftp.software.ibm.com/storage/tivoli-storage-management/patches/storage-agent/5.2.1.3/TSMSTA5213_SUN.README):
>
> *********************************************************************************
> * Host Bus Adapter recommendation      *
> *********************************************************************************
>
> It is highly recommended that Tape Drives and Tape Libraries be connected
> to the
> system on their own host bus adapter and not share with other devices
> types (DISK,
> CDROM, etc.).
>
> Best Regards
>
> Daniel Sparrman
> -----------------------------------
> Daniel Sparrman
> Exist i Stockholm AB
> Propellerv?gen 6B
> 183 62 T?BY
> V?xel: 08 - 754 98 00
> Mobil: 070 - 399 27 51
>
>
>
> Bill Boyer <bill.boyer AT VERIZON DOT NET>
> Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
> 2004-04-29 13:20
> Please respond to
> "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
>
>
> To
> ADSM-L AT VM.MARIST DOT EDU
> cc
>
> Subject
> Disk and Tape access over the same fibre adapter
>
>
>
>
>
>
> Just got a new client that wants to do some LANfree backups, but they
> don't
> believe me when I tell them that the recommended way is to have a separate
> HBA for disk and tape. They don't think that mixing the 2 will be a
> performance issue. I remember a couple years ago this was an issue of data
> corruption, but that has been addresses.
>
> Can someone point me to any whitepapers or documentation explaining why
> they
> should spend a couple more $'s and get an additional adapter for those
> server they want to do LANfree backups on?
>
> TIA,
>
> Bill Boyer
> "Experience is a comb that nature gives us after we go bald." - ??

--
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    =======---------        marcel AT mesa DOT nl                 2630 AC  
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