ADSM-L

Re: EMC as ADSM Disk Device

1997-04-08 08:04:09
Subject: Re: EMC as ADSM Disk Device
From: Digest Info Refcard <Dan.Crouse AT MAILPORT.DELTA-AIR DOT COM>
Date: Tue, 8 Apr 1997 08:04:09 -0400
Klaus,

The only quantifiable benchmark that I have to date is that the system
reported 2ms response time for writes.
This benchmark was taken while running 3 concurrent large file backups (2GB
database files) from 3 non-local clients.  Our database is allocated at
12GB.   We are in the process of migrating from an MVS server, so the
database will not be fully populated for a couple of months.  I am very
interested in your benchmarks:
 Are your timings based on single stream backups our on multiple concurrent
sessions?
 Are the clients located on the same system as the server?
 Which protocol are you using (TCP/IP, shared memory, etc.)?
Our R40 is a dedicated ADSM server, it has no application data of its own.
Our clients are non-local systems connected via ethernet and FDDI
connections.  We use TCP/IP exclusively.  We are in the process of
implementing a switched FDDI hub for our larger clients.

We considered using SSA disks; however, the EMC disks were already on the
floor to support another application (read FREE).  My understanding of the
performance differences between the two is as follows.  The SSA disks
provide a consistent response time in the event of either a read or a
write.  The time quoted to me was 8ms.  The EMC disks take advantage a
large cache to provide its performance.  An EMC device will always write to
cache (<4ms).  On a read, if the data is in cache you will achieve similar
performance; however if the data is not in cache and you have to read from
disk, the response time significantly greater.  We estimated 13ms.   Your
particular performance will vary based on your read/write mix and the
randomness of your reads.  Since backup processing is a write intensive
function, the EMC disk perform well in this scenario.

I would be happy to work with you to establish comparative benchmarks.

>Date:    Mon, 7 Apr 1997 17:57:26 +0200
>From:    Klaus Schmidt <K.Schmidt AT STUD.UNI-FRANKFURT DOT DE>
>Subject: EMC as ADSM Disk Device
>
>DanC,
>
>> We have our RS/6000 enhanced ADSM server connected to an EMC 5500.  In
>> addition to our storage pools, we also have our database and log files
>> defined on these volumes.  We are using raw devices.  These disks are
>> performing very well for us.
>This sounds interesting! Can you give quantify "very well", eg. how fast
>you can delete files using the "del file" command or how many 1KB files
>you can back up per second?
>What is your database size?
>How fast can you back up large file to a storage pool on EMC?
>
>We achive 20 1KB files/second to backup, 5MB/sec for backup of large
>(10MB) files.
>We use SSA disks, on a RS6000/R40.
>
>Regards, Klaus
>
>--
>Klaus Schmidt (baakueds AT ufer.zib-berlin DOT de)
>EDS Electronic Data Systems (Deutschland) GmbH
>Eisentrasse 58-5-M                              Tel: (49)6142/80-1265
>D-65428 Ruesselsheim                            Fax:            -1758


DanC
=============================================
Daniel G. Crouse
Mainstar Software Corporation
Email:  Dan.Crouse AT Transquest DOT com
Vmail:  800-233-6838
Voice:  404-714-5754
   Fax:  770-682-7739
=============================================



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