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тАО12-19-2007 04:07 AM
тАО12-19-2007 04:07 AM
I have bought a proliant ML 350 G5 storage server with 2x250 GB RAID 1 disks on a smartArray E200i (64Mb onboard).
I'm experiencing terrifying performance leaks on SAS disks. I've tried every flavor of *nux except RHE, i386/AMD_64 distros and I've installed all the software required (hp-OpenPMI, hpasm,hprsm,cmanic,hpsmh and so on) without any problem. There are no kernel errors, the hardware is ok, HP Italy said that they could not do anything for such issues.
On a _clean_ installation (currently I'm using a SUSE enterprise) the avarage write speed is near 10 Mb/sec. When the server start executing programs which requires a lot of write accesses to the disk the system will slow down then hang. A 'sync' will take minutes to complete and the console login will timeout without being able to insert the password as requested.
Can anyone help me?
Regards,
Matteo
Solved! Go to Solution.
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тАО12-19-2007 04:38 AM
тАО12-19-2007 04:38 AM
SolutionTo improve the performance of ur system, The Controller cache memory can be upgraded to the maximum available & also make sure the HDD & Controller are also updated.
By doing this I have fixed performance issue with ML350G5 normal server.
But for maximum performance, we used P400 controller with 512MB BBWC & change the Read/Write cache ratio to 25:75.
May be that info would help u out.
TarunJain
I am an HPE Employee
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тАО12-19-2007 05:45 AM
тАО12-19-2007 05:45 AM
Re: [long] HELP! HP ML 350 G5 storage server _very_slow_ performances
I thought to buy a memory expansion for the controller but I thought that it could have been pointless with starting performance of the disks so poor! So I believed to have troubles in my installation.
How can HP sell a _storage_ server which such writing performance? The benchmark suite on the virtual machine (a windows 2000 on vmware) reports a write speed of 6Mb which is highly insufficient for the company purposes.
Sincerely I would have liked to know this in advance!
Thanks again and regards
Matteo
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тАО12-20-2007 12:02 AM
тАО12-20-2007 12:02 AM
Re: [long] HELP! HP ML 350 G5 storage server _very_slow_ performances
????
are you sure you use the configuration as HP intended this?
from specs : Preconfigured hardware: Operating System drives and RAID preconfigured for out of the box "plug and play" installation
First step i would suggest is to eliminate the virtualisation layer and use w2k3 directly! then do the benchmarks.
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тАО12-20-2007 12:27 AM
тАО12-20-2007 12:27 AM
Re: [long] HELP! HP ML 350 G5 storage server _very_slow_ performances
For sake of clarity, outside the VM the writing performances are a little better, but still slower than the single disk in my home pc.
Thanks anyway!
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тАО12-20-2007 12:35 AM
тАО12-20-2007 12:35 AM
Re: [long] HELP! HP ML 350 G5 storage server _very_slow_ performances
raid-1 means two controller write-operations for every I/O from the OS.
When there is too little cache this gives a performance drop when writing, instead of a performance gain when reading because two disks can service different i/o requests.
Pieter
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тАО12-20-2007 01:07 AM
тАО12-20-2007 01:07 AM
Re: [long] HELP! HP ML 350 G5 storage server _very_slow_ performances
It seems odd to me that the old PIII server that this proliant should substitute, with an Adaptec ATA RAID 1200A controller (software emulation, no cache) had none of the above problems. And it's at least 3 times faster.
Regards
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тАО12-20-2007 03:15 AM
тАО12-20-2007 03:15 AM
Re: [long] HELP! HP ML 350 G5 storage server _very_slow_ performances
But, who sold a storage server to you to run an application? Storages servers are used for file serving, NAS, backup managers and also SAN.
There are several solutions to you. U can keep this config, RAID1 with yours 250GB SAS disks. Or increase your cache memmory, or buy two more disks to your server and expand your array to four disks and extend your logical volume to RAID1+0. Yes the controller can do it online.
With more disks working together, you can have greater throughput. That's the concept of JBODs, Storages in the SAN or we can say that's the concept of RAID.
Regards
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тАО12-20-2007 08:04 AM
тАО12-20-2007 08:04 AM
Re: [long] HELP! HP ML 350 G5 storage server _very_slow_ performances
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тАО12-20-2007 08:05 AM
тАО12-20-2007 08:05 AM
Re: [long] HELP! HP ML 350 G5 storage server _very_slow_ performances
Regards