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Re: [LUG] Business switched
On Friday 27 August 2004 07:55, Simon Waters wrote:
It is hardware RAID controller that presents SCSI, but has SATA disks
LSI Logic MegaRAID 6.62 254 commands 16 targs 7 chans 7 luns
But surely that is the point of hardware RAID - the OS only needs a
minimal clue that it is happening for administrative purposes.
I think the cheap IDE hardware RAID stuff does rely on drivers to do a lot of
the work... The main problem is that (at least for hardware IDE RAID) the
drivers are often closed source, poorly tested and dangerously outdated...
IDE RAID in software is rock solid in my experience, as much as software
RAID ever is (i.e. write some crap to one disk only and wait for the
crash ;-). Indeed I've always found Linux software RAID stuff remarkably
resilient given the "quality hardware" usually thrown at it.
How did the server die? How was it configured?
It was a Redhat 8.0 machine with an onboard Promise FastTrack IDE RAID
controller doing RAID 1.
One day the machine just died. Rebooted it to find that the filesystem was
trashed beyond repair (thank god for backups). I was unable to do a proper
post-mortem at the time (it was reinstalled with Windows 2000 before I got a
chance), but I think it's reasonable to conclude that the RAID driver was to
I might give IDE RAID another chance and play with it on a spare machine, but
I'm in no rush to use 2 year-old non-free drivers which will only work with
2.4 kernels. Perhaps it is better to stick to software RAID with IDE - I must
give that a try sometime.
Is there support for SATA RAID actually in the kernel or do you need to
compile third-party modules? I'd be much happier using a free and well-tested
driver which doesn't rely on the hardware manufacturer to maintain it.
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