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тАО06-07-2009 02:41 PM
тАО06-07-2009 02:41 PM
Hi folks,
We've recently purchased a DL180 G5 to use as a domain controller and file server in a branch office and are having real troubles with it.
We have the OS (Win 2008 x64) installed on a pair of mirrored drives, and 4 1TB SATA drives in RAID5 config for storing user files. The performance when read and writing is currently very poor, I've read a few other topics and it seems other people are having similar problems.
I want to try and improve the performance if I can, but I just wanted a few pointers first.
We only have the one server currently in the office and not 100% of the data on the 4TB RAID is backed up, one of the suggestions I've seen is to move the P400 to another PCIe slot, can I do this without ruining the RAID config/losing data? My first thought was that it would be fine but confirmation would be appreciated.
We've also purchased a BBWC to add to the P400 since the standard configuration didn't come with one, once this is installed would we see a vast improvement? or does adding the BBWC only offer a limited improvement?
Any help or suggestions you can offer would be greatly appreciated. Thanks.
We've recently purchased a DL180 G5 to use as a domain controller and file server in a branch office and are having real troubles with it.
We have the OS (Win 2008 x64) installed on a pair of mirrored drives, and 4 1TB SATA drives in RAID5 config for storing user files. The performance when read and writing is currently very poor, I've read a few other topics and it seems other people are having similar problems.
I want to try and improve the performance if I can, but I just wanted a few pointers first.
We only have the one server currently in the office and not 100% of the data on the 4TB RAID is backed up, one of the suggestions I've seen is to move the P400 to another PCIe slot, can I do this without ruining the RAID config/losing data? My first thought was that it would be fine but confirmation would be appreciated.
We've also purchased a BBWC to add to the P400 since the standard configuration didn't come with one, once this is installed would we see a vast improvement? or does adding the BBWC only offer a limited improvement?
Any help or suggestions you can offer would be greatly appreciated. Thanks.
Solved! Go to Solution.
3 REPLIES 3
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тАО06-07-2009 11:29 PM
тАО06-07-2009 11:29 PM
Solution
Hello,
the RAID configuration is saved on the disks, not on the controller. You can change the PCIe slot without losing the config.
A BBWC will speedup the write performance noticeable. Without a BBWC the write cache won't be activated.
Best regards,
Patrick
the RAID configuration is saved on the disks, not on the controller. You can change the PCIe slot without losing the config.
A BBWC will speedup the write performance noticeable. Without a BBWC the write cache won't be activated.
Best regards,
Patrick
Best regards,
Patrick
Patrick
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тАО06-08-2009 01:24 AM
тАО06-08-2009 01:24 AM
Re: DL180 G5 + P400 RAID Issues
Thanks Patrick,
I haven't moved the P400 to another PCIe slot yet but installing the BBWC has improved things a fair bit.
I haven't moved the P400 to another PCIe slot yet but installing the BBWC has improved things a fair bit.
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тАО06-08-2009 01:59 AM
тАО06-08-2009 01:59 AM
Re: DL180 G5 + P400 RAID Issues
Hello,
performence depends on many factors. MB/s is nothing more then "IOs per Second x IO size". If you have many small IOs, and only three disks, you won't get much MB/s. If you have big IOs and many disks, you will get a lot of MB/s. You have written that you have 4x 1 TB drives in a RAID 5. On 1 TB disks will get round about 100 IOPS. So you will not get more then 300 IOPS while reading from the array. If you're average IO has a size of 16 KB, you will get only round about 4,5 MB/s. Not much for 4 disks in a RAID 5.
Missing performance must not be a problem of the controller. It's often a problem of to few disks and to small IOs.
Best regards,
Patrick
performence depends on many factors. MB/s is nothing more then "IOs per Second x IO size". If you have many small IOs, and only three disks, you won't get much MB/s. If you have big IOs and many disks, you will get a lot of MB/s. You have written that you have 4x 1 TB drives in a RAID 5. On 1 TB disks will get round about 100 IOPS. So you will not get more then 300 IOPS while reading from the array. If you're average IO has a size of 16 KB, you will get only round about 4,5 MB/s. Not much for 4 disks in a RAID 5.
Missing performance must not be a problem of the controller. It's often a problem of to few disks and to small IOs.
Best regards,
Patrick
Best regards,
Patrick
Patrick
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