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Firebird and RAID

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Firebird and RAID Firebird SQL Development forum discussing administration, Firebird SQL syntax, or other Firebird SQL-related topics. Firebird is the evolution of Borland's Interbase product.

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  #1  
Old August 20th, 2004, 02:32 PM
ksaul ksaul is offline
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Firebird and RAID
We have a third party Java application running against a Firebird DB and we are running into an interesting problem. If we run this application on a server with RAID 1 (SCSI or IDE) the application performs very slow and the system never uses more than 8-10% of the CPU. If the application is run without RAID it is extremely fast and will use 100% CPU.

Anybody have any thoughts?
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Old August 23rd, 2004, 03:30 AM
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Originally Posted by ksaul
We have a third party Java application running against a Firebird DB and we are running into an interesting problem. If we run this application on a server with RAID 1 (SCSI or IDE) the application performs very slow and the system never uses more than 8-10% of the CPU. If the application is run without RAID it is extremely fast and will use 100% CPU.

Anybody have any thoughts?


Maybe is related to write performance on raid 1
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Write performance is slightly worse than on a single device, because identical copies of the data written must be sent to every disk in the array. The write is not complete until all disk writes are finished. Reading may be faster than without RAID-1, depending on the read-balancing strategy that is implemented. We did not benchmark our RAID setups. We are using RAID to provide data redundancy, not to improve disk performance.

http://www.linuxjournal.com/article.php?sid=5653

ps : how can we reproduce this ? maybe doing some inserts on a raid 1 partition then on a single drive ?
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Old August 23rd, 2004, 01:33 PM
ksaul ksaul is offline
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Thanks for your thoughts. We decided to check out RAID 0 and it has the same problems on both SCSI320 and IDE hardware based RAID.

In terms of disk read/write delay, I am leaning away from that path. With HW RAID our form takes 40 seconds to load, without RAID it takes 8. This morning we tested W2K software RAID there is no problem.

Our SCSI testbed is a Compaq DL360 XEON 2.8Ghz, 1Gb RAM, Ultra320 SCSI; IDE is a custom 4U P4 3.06Ghz, 1Gb RAM, 3Ware IDE.

We run other applications (non Java) on the same boxes against significantly larger Firebird db's and do not have any performance problems.
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