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Re: Howto: amanda sata backup server (hw raid controllers)
2008-08-01 11:09:38
Hi,
I also use 3Ware Raid Controllers for several years in my and my
customers linux machines. I only had trouble with one of them. The 3Ware
driver is opensource and is included in the kernel. So you don't need to
compile or install anything. The controller is running out of the box.
You can install the 3Ware tools to get an command line and web interface
for administration. Once I had trouble the 3Ware support helped me very
fast and professional. I only see 2 points to think about. If you enable
write caching you should use an UPS. If power fails without an UPS the
controller is unable to write its cache to the disks and you'll lose
some data or get an corrupt filesystem. The other point is, that your
controller is a single point of failure. Normally the next generation of
3Ware controllers is able to read the on-disk-format of the generation
before but in my opinion it is better to buy 2 controllers and have one
at the side.
Regards
Sebastian
Snorre Stamnes schrieb:
Marc Muehlfeld wrote:
Snorre Stamnes schrieb:
Why shouldn't it be OK? I mean, you are using softraid, so I guess
you don't have a big server/network.
The problem I am having is that currently all partitions except
/holdingdisk are on the same raid5 (/backup, /, and /data). When
doing backups of /data and / to /backup the server is very slow and
bottle-necked. I think by switching the the above scheme will fix
the problem.
It ll still be a bottleneck if the new disks are softraid again. Try
thinking about a hardware raid controller (not one of the cheap
onboard raid which is handled by the CPU itself). But it is all a
thing of what you want to spend and if it's required. If you just
have a few GB to backup every night, it's surely no big deal. I have
to backup ~ 250 GB each night and 750 GB on complete level 0. For me
it's required to ensure that the backup finishes until next morning.
I have heard horror stories about hardware raid, and I like the
openness of Linux software raid. However if hardware raid is simply
significantly faster I will look into that.
Are there any companies/cards you (or anyone on this list) would
recommend regarding hardware raid controllers?
I know you recommended the 3Ware 9550SXU-8LP Sata Controller so I will
look at that one.
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