>> Our experience with 3Ware has been that failures often go unseen, write
speed
>> suffers drastically, and adding/removing drives requires extra
intervention.
Perhaps I can learn something here, Ian. I've used 3Ware hardware mirroring
so that I could mirror the swap partition. It is my understanding that
software RAID will not mirror Swap, and failure of the swap partition will
crash the system. Am I missing something?
My goal is not to crash the server, in the event of a HDD failure. I don't
mind a scheduled shutdown to replace a drive and rebuild the system. How do
you avoid crashing the system if your swap partition fails?
Ken Elliott
=====================
-----Original Message-----
From: slug@nks.net [mailto:slug@nks.net] On Behalf Of Ian C. Blenke
Sent: Thursday, July 13, 2006 2:07 PM
To: slug@nks.net
Subject: Re: [SLUG] Is RAID worth doing?
steve szmidt wrote:
>On Thursday 13 July 2006 13:14, Ian C. Blenke wrote:
>
>
>H/W RAID has always been my preference (except for some smaller places)
>with next to no fuss. For years I've now relied on 3Ware and had very
>good statistics. S/W RAID is pretty interesting and obviously cheaper.
>On heavy load it does have a problem keeping up with writes and of
>course you cannot do hot swap last time I checked.
>
>
Our experience with 3Ware has been that failures often go unseen, write
speed suffers drastically, and adding/removing drives requires extra
intervention.
In the NKS farm, we simply pop in a blank drive and restore the
partitioning:
sfdisk -d /dev/hda | sfdisk -f /dev/hdc
Then reboot. Viola, the system comes back up and starts resyncing.
If a drive is hot swapped, even a boot can be avoided. Just re-read the
partitioning and mdadd back the new partitions (partprobe is from the parted
package, you just need something that can do a BLKRRPART ioctl()):
partprobe /dev/hdc
mdadm --manage /dev/md0 --add /dev/hdc1
...
and so on.
- Ian C. Blenke <ian@blenke.com> http://ian.blenke.com
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