Can anyone tell me which versions of CentOS/kernel support the LSI 2008 SAS chipset, as used in the Supermicro X8DT6-F motherboard?
It's billed as a "hardware RAID" controller. Is this real RAID or fake RAID? I will be having two hard drives in a mirrored configuration. I usually use MD software RAID1, mirroring at the partition level. Would this still be best with this chipset, or would hardware RAID1 mirroring be better?
Anything else I should watch out for?
I'm also interested in whether it's even worthwhile going for the SAS rather than just sticking to SATA drives with AHCI.
Thanks in advance for any comments!
Tony
On 03/23/12 5:04 AM, Tony Mountifield wrote:
Can anyone tell me which versions of CentOS/kernel support the LSI 2008 SAS chipset, as used in the Supermicro X8DT6-F motherboard?
It's billed as a "hardware RAID" controller. Is this real RAID or fake RAID? I will be having two hard drives in a mirrored configuration. I usually use MD software RAID1, mirroring at the partition level. Would this still be best with this chipset, or would hardware RAID1 mirroring be better?
the MPT2SAS driver for those chips should be in c5.recent and most definitely are in C6
its 'real' hardware reid, but doesn't have significant cache or any battery or flash backup, so its hardly worth using the raid. I configure these as simple JBOD and let Linux do the mirroring.
In article 4F6C9123.2000800@hogranch.com, John R Pierce pierce@hogranch.com wrote:
On 03/23/12 5:04 AM, Tony Mountifield wrote:
Can anyone tell me which versions of CentOS/kernel support the LSI 2008 SAS chipset, as used in the Supermicro X8DT6-F motherboard?
It's billed as a "hardware RAID" controller. Is this real RAID or fake RAID? I will be having two hard drives in a mirrored configuration. I usually use MD software RAID1, mirroring at the partition level. Would this still be best with this chipset, or would hardware RAID1 mirroring be better?
the MPT2SAS driver for those chips should be in c5.recent and most definitely are in C6
its 'real' hardware reid, but doesn't have significant cache or any battery or flash backup, so its hardly worth using the raid. I configure these as simple JBOD and let Linux do the mirroring.
Thanks, that's what I thought.
Would I see much difference in performance or CPU load between SAS and SATA disks of the same geometry and RPM speed? Such as Seagate Constellation drives, which are available in SAS or SATA.
Cheers Tony
On 03/23/12 10:05 AM, Tony Mountifield wrote:
Would I see much difference in performance or CPU load between SAS and SATA disks of the same geometry and RPM speed? Such as Seagate Constellation drives, which are available in SAS or SATA.
SAS disks tend to do better under high concurrency, and support dual porting. whether or not this matters with a simple mirror, I dunno.
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John R Pierce -
tony＠softins.co.uk