Re: Software RAID1 (with non-identical discs) performance

2006-12-19 Thread Dick Streefland
Wiebe Cazemier <[EMAIL PROTECTED]> wrote: | And with one Maxtor 250 GB and one Seagate 250 GB, will that work? It can go | wrong on two accounts; the geometry issue I desbribed (which, I understand, | shouldn't be an issue at all), and if you're trying to clone the partition | table on a smaller di

Re: Software RAID1 (with non-identical discs) performance

2006-12-19 Thread Jan Engelhardt
>Think of "PnP geometry" supported by all nowadays drives. > >It's 255 heads, 63 sectors per track, and whatever number of cylinders. You do not really need the 255-63-X PNP mode. Given a hard disk small enough, VMware may make it a 16-63-X, 16-64-X, or something like that. Still works as intende

Re: Software RAID1 (with non-identical discs) performance

2006-12-19 Thread Wiebe Cazemier
On Tuesday 19 December 2006 15:16, Dick Streefland wrote: > An easy way to clone a partition table is: > > sfdisk -d /dev/sdX | sfdisk /dev/sdY > And with one Maxtor 250 GB and one Seagate 250 GB, will that work? It can go wrong on two accounts; the geometry issue I desbribed (which, I unders

Re: Software RAID1 (with non-identical discs) performance

2006-12-19 Thread Dick Streefland
Phillip Susi <[EMAIL PROTECTED]> wrote: | The entire concept of geometry is a a carryover from days gone by. | These days it is just a farse maintained for backwards compatibility. | You can put fdisk into sector mode with the 'u' command and create | partitions of any number of sectors you desi

Re: Software RAID1 (with non-identical discs) performance

2006-12-19 Thread Michael Tokarev
Wiebe Cazemier wrote: > For some reason, your message doesn't appear in the GMane mail-to-news > gateway. > I've quoted your message here. Hopefully, the quoting isn't messed up. > >> The entire concept of geometry is a a carryover from days gone by. These days > it is just a farse maintained for

Re: Software RAID1 (with non-identical discs) performance

2006-12-19 Thread Wiebe Cazemier
For some reason, your message doesn't appear in the GMane mail-to-news gateway. I've quoted your message here. Hopefully, the quoting isn't messed up. > The entire concept of geometry is a a carryover from days gone by. These days it is just a farse maintained for backwards compatibility. You can

Re: Software RAID1 (with non-identical discs) performance

2006-12-18 Thread Phillip Susi
Wiebe Cazemier wrote: When using non-identical discs (not just size, but also geometry) to contruct your array, you can never get the partitions of the underlying discs to be equal in size because the size of a partition can only be N*cylindersize, where cylindersize varies across discs; the arra

Software RAID1 (with non-identical discs) performance

2006-12-16 Thread Wiebe Cazemier
Hi, I'm planning to put a software RAID1 array in my computer, but I have a few technical questions. When using non-identical discs (not just size, but also geometry) to contruct your array, you can never get the partitions of the underlying discs to be equal in size because the size of a partit