Hi Leonard, Lot of thanks for your detail information and time
I shall digest those documentation first before finalizing my way to go. RAID 0, RAID 1, or RAID 5 , etc.? My plan is to build a Web Server using Apache, PHP, MySQL, etc. to experience its function. I hesitate whether I should use RAID simultaneously at start. Because I have been away from Linux for sometime, almost 2 years and coming back recently. Therefore I have to refresh my technical memory on all commands, some of them having be changed or replaced which keeps me quite busy. Hardware is not a problem to me. I am in electronic industry manufacturing PSTN phones, having certain knowledge on uC (micro-controller). One additional question I expect to ask, in my case, whether it is advisable to apply RAID to build the Web Server simultaneously because the configuration of Apache, PHP, MySQL will keep me quite busy (I did it once in 2 years ago). Is RAID difficult to set up ? Which RAID, RAID 0+1, RAID 5, etc. shall be more applicable to my case ? Thanks in advance. B.R. Stephen At 11:01 PM 12/17/2001 +0100, you wrote: > Hi Stephen, > > > I am using 2th Max 8KHA motherboard. Unfortunately it has only one FDD1 > > channel for ATA100 hard disc. Additionally it has 2 ATA33 IDE channels > > (altogether 3 channels). If I add an ATA100 controller then I shall have 3 > > ATA100 channels, having a waste (5 channels). > > The ATA33 channels will probably not slow your array down too much, as long >as you put each disk on a separate controller. Most disks will not saturate >the bus, although some modern 7200 rpm drives will. You will probably still >have quite a speed increment anyway. But of course, if you need the speed and >you have brand new 7200 rpm drives get yourself an extra ATA100 controller. > > > Could I use 2 hard discs having different specification and capacity ? > > Yes, but if you don't want to waste any space you will create partitions > that >are of equal size to construct the RAID array, ie, if hda1 and hdc1 are in >one >array you will want to make them similarly sized. > > > Could you please explain a little bid in detail, to mirror first few > > partitions on each hard disc ? How many hard disc you install ? 4 > hard discs > > to achieve RAID 0 + 1 ? > > Yes. (At least) four disks for RAID10. You could stripe more than two disks >as well. RAID10 is probably the best if you want both redundancy and (write) >speed, but you "waste" half of the disks. RAID5 is probably a better idea, >because you use n + 1 disks instead of 2n. As said in my previous post read >speed is great with RAID5, but don't expect any improvements in write speed. >The array I constructed writes as fast as a single disk on the Promise >controller. Writing to the onboard controller is a little slower, so you >could >argue write speed increases for the array a little as well. > It is definitely important you tweak the block sizes and parity algorithm >(the installer (for 7.1) doesn't allow the choice of the parity algorithm, so >you should create the RAID devices before or after you install). Recreate the >array with different block sizes (8k was best in my case) and time a dd of a >few hundred megs to see the difference. Wait with the timing until the device >is fully recreated (run top to see if the raid module is using up a lot of >CPU >time). If you are using RAID10 you will have to try quite some >permutations of >blocksizes for the stripes as well as the mirror. > Don't forget to check out the Software-RAID-HOWTO, which you can find under >/usr/share/doc/HOWTO if you installed the howto rpm. > > Bye, > > Leonard. _______________________________________________ Redhat-list mailing list [EMAIL PROTECTED] https://listman.redhat.com/mailman/listinfo/redhat-list
