Two questions about performance

1999-07-10 Thread Juan Piernas Cánovas
Hi all! I have two questions: 1.- Why are RAID-1 writes slower than writes to one of the RAID-1 disks?. Software overhead?. Hardware problems?. 2.- Why are RAID-1 reads slightly better than reads from one of the RAID-1 disks?. If a RAID-1 is made up of two disks, I've got two copies of data and

Re: backup/redundancy solutions

1999-07-10 Thread Jonathan F. Dill
Osma Ahvenlampi wrote: > > Amanda's main problem is that it depends on tar or dump, and neither > is all that great. Especially dump on Linux has major problems (no > multivolume backups, no proper end-of-tape detection (which means > trouble on at least Sony and Seagate drives), no software comp

How to setup Raid-0 or linear on Redhat 6 and kernel 2.2.10??

1999-07-10 Thread Johan Ankarloo
Hi, i have a problem with setting up raid-0 or linear on a Redhat 6.0 with the new 2.2.10 kernel. I have tried to path the kernel with the path for 2.2.5 but with no luck. I get no specific error code. What am i doing wrong?? Please help me. My conf file for the raid disks ## /etc/raidtab ## ra

Re: backup/redundancy solutions

1999-07-10 Thread Gordon Henderson
On 10 Jul 1999, Osma Ahvenlampi wrote: > Gordon Henderson <[EMAIL PROTECTED]> writes: > > So does no-one apart from me use Amanda? > > Amanda's main problem is that it depends on tar or dump, and neither > is all that great. Especially dump on Linux has major problems (no > multivolume backups,

Re: A view from the other side...

1999-07-10 Thread Osma Ahvenlampi
Mike Frisch <[EMAIL PROTECTED]> writes: > > If the drives are the same size, the following command works very well to > > copy a partition table from one to the other: > > dd if=/dev/sda of=/dev/sdb bs=1024 count=5 > I am curious to know if this can help in creating a RAID1 mirror from an > existi

Re: backup/redundancy solutions

1999-07-10 Thread Osma Ahvenlampi
Gordon Henderson <[EMAIL PROTECTED]> writes: > So does no-one apart from me use Amanda? Amanda's main problem is that it depends on tar or dump, and neither is all that great. Especially dump on Linux has major problems (no multivolume backups, no proper end-of-tape detection (which means trouble

Many hdX-devices?

1999-07-10 Thread niklas
Hi, I've been fooling around with raid-tools in combination with the promise ultra/66 controller together with a couple of IBM desk-star 22 Gb disks. And I really like what I see. My main concern now is about how far these things will scale. When reading /usr/src/linux/Documentation/devices.tx

/bin/df on raid 1 array

1999-07-10 Thread Rodolphe SIBERT
Hi, I've just set up a RAID 1 array on a RedHat 6.0 system. It works fine but df doesn't return the used space of the disk ... I fllowed the software-raid howto from Jakob OEstergaard and every thing worked right (I could't manage to build kernel 2.5.10 with raid support : maybe i should apply so