Re: I LOVE RAID 5!!!!!!!!!!!!!!!!!!!!!

Francisco Huezo wrote: > > Hi. > > I did this test in my box, I wrote 100 MB in two filesystem, > one of them was in RAID5 and another not. The two filesystem was over the same > kind of disk. > > Well I got this values: > > Filesystem without raid5: 8500 KB/s > Filesystem with raid5: 2200 KB/s > > In fact, the write throughput is ones of cost. > > Maybe, you should do your own test and evaluate the results. > Here there are two tip how you can measure the write throughput. > if you use to be a raw devices > time ( dd if=/dev/disk01 of=/dev/disck02 ) > otherwise > time ( cp file1 file2 ) Yes, but dd isn't a very close approximation to the disk access of a RDBMS or even an ORDBMS, is it? It's more akin to a UNIX file system. I think the original question was about using RAID 5 with a database server, not a file system. Cheers, -- Mark. +----------------------------------------------------------+-----------+ | Mark D. Stock mailto:mdstock@mydas.freeserve.co.uk |//////// /| | http://www.informix.com http://www.informixhandbook.com |///// / //| | http://www.iiug.org +-----------------------------------+//// / ///| | |This email will self-destruct in |/// / ////| | |10 sec. If you received this email |// / /////| | |in error, sorry about the mess. |/ ////////| +----------------------+-----------------------------------+-----------+