Re: Tuning tips?
1997-12-10 12:48:25
Thanks for feedback...I'm fortunate that I do not have to worry about bandwith,
as the ATM network is for ADSM use. I will play with compression but can you
tell me what the CPU penalty for using ADSM compression?
Thanks -- Perry
Lee Russon wrote:
> Perry,
>
> Consider using ADSM compression on your AIX clients as this can improve
> network throughput. We tested RS/6000 AIX clients running with compression
> and without and found that the backup of data took 3 times as long without
> compression. If network bandwidth is not a problem then leave compression
> off, but remember that more data will be processed by the server before the
> data arrives on tape.
>
> We transfer all client backup data to a primary disk pool overnight and copy
> the disk pool data to tape after all clients have been backed up. The tapes
> are then sent to off-site storage. During the day we migrate data from the
> disk pool to on-site tape to free up space for the next nights run. This
> method seems to work quite well as client machines do not have to wait for
> tapes to be mounted and the server has less data to process.
>
> The options you use on the clients are very similar to our own, but you may
> find that increasing the TXNBytelimit may improve performance (it all depends
> on how fast your HP/IBM machines are)
>
> Regards,
> Lee Russon
> Midlands Electricity plc
> ----------
> From: McGrew, Perry
> To: adsm-l AT vm.marist DOT edu
> Subject: Tuning tips?
> Date: 10 December 1997 13:59
>
> We've just installed ADSM/MVS 3.1 on our TCP/IP 3.2 Ethernet network
> over ATM (LANE) backbone. We have the lastest ADSM 3.x client code on
> our HP-UX 10.2 & IBM AIX 4.3 servers.
> In the dsmsched.log I am seeing:
> Network data transfer rate: 1,772.97 KB/sec
> Aggregate data transfer rate: 1,468.25 KB/sec
> We do not have ADSM compression turned on as we are using hardware
> compression on our 3494/3590 MagStar tape drives.
> Our TCPIP/MVS 3.2, the LARGEDATABUFFERPOOLSIZE is set to 32768.
> In the HP / AIX Clients' the dsm.sys parameters are:
> TCPWindowsize 64
> TCPBuffsize 32
> TXNBytelimit 2048
> Any help in identifying critical tuning points will be appreciated!
> Thanks,
> Perry McGrew
> Agway Inc.
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