New answers tagged hardware-raid
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.
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 ...
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.
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 ...
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 ...
I have the exact same motherboard and raid controller, experiencing the exact same issue.
If using ZFS, you can create your pools with ashift=12 if you're dealing with 4k-sector disks.
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
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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