RE: [CentOS] question on RAID performance

2008-04-11 Thread Ross S. W. Walker
Jason wrote: > John J. Lee wrote: > > On Thu, Apr 10, 2008 at 8:18 PM, Miguel Medalha <[EMAIL PROTECTED]> wrote: > >>> > >>> I was wonder what experiences there are out there with using RAID-X for > >>> performance increases. I do use RAID-1 (2 disks) but am interested in > >>> attemtps to gain hig

Re: [CentOS] question on RAID performance

2008-04-11 Thread Jason
while it takes a minimum of 6 disks, we've had great luck with RAID 50. Two separate RAID 5 arrays (fast read, moderate writes) that are then placed into a RAID 0 (fast read, fast write). you lose 2 drives worth of space, but lord it's fast and the data is mirrored. Not sure if you can do the wh

Re: [CentOS] question on RAID performance

2008-04-10 Thread John J. Lee
I am currently running 7 raid10 data servers. I can say read speed increases but I doubt the write speed comparing to non raid setup. The main advantage of the raid is redundancy but not the performance. If you want to boost the disk performance, go for the faster drive with more than 10,000rpm s

Re: [CentOS] question on RAID performance

2008-04-10 Thread Guy Boisvert
John J. Lee wrote: On Thu, Apr 10, 2008 at 6:43 PM, Jerry Geis <[EMAIL PROTECTED]> wrote: Hi all, I was wonder what experiences there are out there with using RAID-X for performance increases. I do use RAID-1 (2 disks) but am interested in attemtps to gain higher R/W performance. Do the RAID

Re: [CentOS] question on RAID performance

2008-04-10 Thread Miguel Medalha
Have you tried RAID 10? It combines the security of RAID 1 with the speed of RAID 0. dmraid supports this RAID type. I was wonder what experiences there are out there with using RAID-X for performance increases. I do use RAID-1 (2 disks) but am interested in attemtps to gain higher R/W performa

Re: [CentOS] question on RAID performance

2008-04-10 Thread John J. Lee
If you want to higher R/W performance, you should go for raid0. raid0 fragments the data into the number of disks and distributes them. It gains a big performance. One drive fails, however, all data gone. raid5's benefit is not the speed but the effective space usage with the least data redundancy

[CentOS] question on RAID performance

2008-04-10 Thread Jerry Geis
Hi all, I was wonder what experiences there are out there with using RAID-X for performance increases. I do use RAID-1 (2 disks) but am interested in attemtps to gain higher R/W performance. Do the RAID-5's etc give noticeable performace increases? A significant help for me was using ccache fo