Hello Cristiano,
The mem adding has no effect at all, the server runs exacly the way it is.
Regards,
Bart Lubberdink
Cristiano Caruso <[EMAIL PROTECTED]>
18-11-2005 10:47
Aan: [EMAIL PROTECTED]
cc: Simon Matter <[EMAIL PROTECTED]>, maxdb@lists.mysql.com
Onderwerp: Re: Betr.: Re: Very poor performance of sapdb
Have you check the memory configuration under LILO?
I had same problem when I upgraded my server from 512MB of RAM to 4GB
There is a problem with some motherboard, and Linux doesn't use memory
fine.
I solved my problem adding "mem=3360M" in /etc/lilo.conf
I never had the time to test if it works also increasing this value, but
now my server run at warp speed,
and the problem I found was on I/O trhougput, now it's 150-200 time
faster
Sorry for my raw english....
# Kernel command line options that apply to all installed images go
# here. See: The `boot-prompt-HOWO' and `kernel-parameters.txt' in
# the Linux kernel `Documentation' directory.
#
append="mem=3360M"
# Boot up Linux by default.
#
default=Linux
image=/vmlinuz
label=Linux
read-only
# restricted
# alias=1
image=/vmlinuz.old
label=LinuxOLD
read-only
optional
# restricted
# alias=2
[EMAIL PROTECTED] ha scritto:
>Hello Simon,
>
>Both raid controllers are brand new and working with cache.
>
>We use RedHat AS3 and when looking with the dset utility, the DELL server
>transferes aprox 35M/s read and write from/to the disk when restoring
>The HP does aprox 10k/s read/write!!
>When building the data volumes both servers worked fine.
>Both servers use 8G of memory.
>How can the CPU get involved in this? the CPU is completely bounced
>(95-100% I/O wait).
>
>Regards,
>Bart Lubberdink
>
>
>
>
>Hello,
>
>
>>We use sapdb 7.4.3.31-1 on two different servers.
>>One server is a Dell PowerEdge 6850 and the other is a HP Proliant DL580
>>G3.
>>When checking both systems, the dell is a little bit faster when writing
>>to disk and reading from disk but this is normal because the Dell has
>>
>>
>256M
>
>
>>cach on the raid controller and the HP 'only' 192M.
>>When i create a database from a backup, both machines create the log and
>>data volume almost in the same time (normal write speed)
>>There is one Log volume from 5G and 3 data volumes of 25G.
>>This takes about 40 minutes to build.
>>The problem begins when the actual data is imported form the backup to
>>
>>
>the
>
>
>>database.
>>The Dell server completes the restore (42G) in 40 minutes but the HP is
>>
>>
>so
>
>
>>very slow that after 3 hours, just 1G is imported!
>>
>>Is there a problem with the compatability between sapdb and the HP
>>controller "Smart Array 6i"?
>>Or does anyone have a clue what can be the problem here?
>>
>>
>
>There is much more involved than the RAID controller here. CPU, RAM, OS,
>almost everything. However, if you want to concentrate on the RAID
>controller, have a closer look at the cache. Do they both have battery
>backed cache, and are the batteries in good condition. Usually only then
>the cache is operated in write-back mode.
>
>Simon
>
>
>
>>Regards,
>>
>>Bart Lubberdink
>>RAM Mobile Data
>>
>>
>>
>>
>
>
>
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>
>No virus found in this incoming message.
>Checked by AVG Free Edition.
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17/11/2005
>
>
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