Re: ADSM Experiences
1995-09-06 02:30:38
On Tue, 5 Sep 1995 13:00:00 -0500 paul (p.) shields said:
>You should acheive maximum performance and uptime by mirroring two sets of
>stripped volumes. You get all the write benefits of stripping and all the
>read benefits of mirroring. Plus you never have any down time. When a volume
>fails you put a new one in and resynch the databases.
>This is the configuration being recommended by IBM. The problems we are
Well, I can see where that could give you good performance. Going all
out say two seperate RAID disk arrays with decent disk space, each w/4 2GB
disks, you begin to talk some serious money though. I guess just for
kicks you could add a dual controller to each array as well. What would
all that cost ~$50K in IBM equipment? Mucho dinero there.
I would guess a poor man's solution to performance could be to spread the
database over two plain FW/SCSI-2 disk arrays and mirror them, use some
1GB sub-7ms read access disks to spread the database over the maximum
number of spindles. Since the 2GB drives are about 8ms you'd gain 12-15%
increase for the average read but, I think the average write is the same
about 9ms. Even this solution would probably cost what, ~$25K.
Price/performance issues can be such a pain sometimes.
>having is that our backups have a very small average file size, thus require
>a lot of database activity and overhead during backup. What i want to really
>know is with an average file size of 20-40K what kind of performance are
>other sites seeing? If performance is breaking 1500Kb/s, how is you system
>configured to acheive this? We are seeing performance in the 500-1000 Kb/s
>range and this is very dissapointing.
---
Keith A. Crabb Keith AT UH DOT EDU
Keith A. Crabb Keith AT UH DOT EDU
University of Houston Operating Systems Specialist +1-713-743-1530
|
<Prev in Thread] |
Current Thread |
[Next in Thread>
|
- ADSM Experiences, paul (p.) shields
- Re: ADSM Experiences, Mitch Sako
- Re: ADSM Experiences, Paul Zarnowski
- Re: ADSM Experiences, Bill Colwell
- Re: ADSM Experiences, Keith A. Crabb
- Re: ADSM Experiences, Bob Klein
- Re: ADSM Experiences, Mike Dahl
- Re: ADSM Experiences, Paul Zarnowski
- Re: ADSM Experiences, paul (p.) shields
- Re: ADSM Experiences, paul (p.) shields
- Re: ADSM Experiences,
Keith A. Crabb <=
- Re: ADSM Experiences, paul (p.) shields
- Re: ADSM Experiences, Keith A. Crabb
- Re: ADSM Experiences, paul (p.) shields
- Re: ADSM Experiences, Jeff Koeberl
|
|
|