Re: [OT] Price / performance & Software RAID / Hardware RAID / IDE / SCSI
hi ya ron
yuppers... on raid1 mirror and it must die for raid0...
- problem with onboard raid1(mirroring)
- if one removes the disks... it still dies...
and to test if hw stripping works ( raid0 )... lot tougher...
if you can write data to /dev/hda1 in 5 seconds...
writing to striped raid0 will be say 7-10 seconds...
if you can read ata from /dev/hda1 in 5 seconds...
than reading from a stripped raid0 should be say 3-5 seconds...
use bonnie to measure your raid performance...
who knows.... where it winds up.... all depedns on "your system" and
data types... lots of small files or few gigantic files...
- fun to watch people do raid0 for backups....
- i go in and pull a drive out.... and watch them go oh shit..
have fun raiding
alvin
built another raid1 ( mirroring) last night... diff motherboards...
- installed root-raid with boo-hooo redhat installer
-
- unplugged one disk at a time... and it kept booting nicely..
like it supposed to keep working..
-
- than than had to watch it re-sync itself even if it was
an ext3 partition... oh welll...
-
On Thu, 21 Feb 2002, Ron Johnson wrote:
> On Thu, 21 Feb 2002 16:11:33 -0800 (PST) Alvin Oga <aoga@Maggie.Linux-Consulting.com> wrote:
>
> [snip]
> >
> > none of those onboard raid stuff works ...
> >
> > http://www.linux-ide.org/chipsets.html
> >
> >
> > true test is...
> > - install your root-raid setup....
> > - reboot make sure it normally all works .. than test "raid0/1"
> >
> > - power down and disconnect hda
> > - power up and if hw raid isn't working, its dead...
> > - do the same with the other disk
> >
> > if its "truely" hardware raid0/1... disconnecting a drive
> > should still boot the system in degraded raid mode
>
> It should work only in RAID1 mode, since that is "mirroring".
> RAID0 (stripping) _must_ die if a disk is removed from the set.
>
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