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0

For that machine, I'd recommend a used HP Smart Array P400 controller, as it has the same SAS SFF-8484 internal cabling and is age-appropriate to the G5 server. There's no compatibility with your existing array, so you will have to reformat the disks.


2

Some of this has been covered here before... and here, too. I can't think of any situation where you wouldn't want a battery-backed or flash-backed cache unit on your hardware RAID controller. It's what makes write caching possible. See: BBWC: in theory a good idea but has one ever saved your data? If your system panics suddenly, the question as to what ...


2

Yes, redundant power, while reducing the need for a BBU, does not eliminate that need. Consider the case where you wire up A/B power incorrectly, for example. The additional cost for a BBU is usually worth it where your data matters e.g. storage node, DB, etc.


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A "real" hardware RAID controller (not a "fake" RAID that relies on the host CPU) is a freestanding computer separate from the host computer in which it's installed. A hardware RAID controller will handle reading/writing from the disks as the operating system makes requests, but it does not specifically rely on anything running inside the host computer ...


2

Depends. In daily business, your hard disk does write a checksum and some ECC information for every sector being written, and verifies this data during a read operation. If the error is small enough (e.g. a flipped bit or other minor errors) to be covered by your hard disk's ECC capabilities, your hard disk may recover from this on its own. The corrected ...


0

I have the exact same motherboard and raid controller, experiencing the exact same issue.


2

If using ZFS, you can create your pools with ashift=12 if you're dealing with 4k-sector disks.


9

You need a SAS expander and/or a server with a disk backplane that has an embedded expander... Please see: RAID card w/1x mini-SAS connector : how do I physically connect 16 disks? and How exactly does a SAS SFF-8087 breakout cable work? + RAID/connection questions


0

This command will show serial numbers of discs attached to a LSI SAS controller: yum install lsscsi /usr/bin/lsscsi -g smartctl -a /dev/sg0



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