Date: Sun, 25 Jan 2009 20:42:34 +0200 From: Omer Faruk Sen <omerfsen@gmail.com> To: freebsd-questions@freebsd.org Subject: atacontrol software or hardware raid Message-ID: <75a268720901251042p67515b92kda61bc875dcdab97@mail.gmail.com>
next in thread | raw e-mail | index | archive | help
How can I detect if system has Software or hardware raid? Since in manual page:
The atacontrol command can also be used to create purely software RAID
arrays in systems that do NOT have a "real" hardware RAID card such as a
Highpoint or Promise card. A common scenario is a 1U server such as the
HP DL320 G4 or G5. These servers contain a SATA controller that has 2
channels that can contain 2 disks per channel, but the servers are wired
to only place a single SATA drive on each channel.
Or how can I find out if the hardware is "real" hardware RAID card?
For example my system has following dmesg output:
ad4: 152627MB <Seagate ST3160815AS 4.AAB> at ata2-master SATA300
ad6: 152627MB <Seagate ST3160815AS 4.AAB> at ata3-master SATA300
ar0: 152625MB <Intel MatrixRAID RAID1> status: READY
ar0: disk0 READY (master) using ad6 at ata3-master
ar0: disk1 READY (mirror) using ad4 at ata2-master
This system is an intel server with S3210SH server board in it. While
installing system I see ad4,ad6 and ar0 as harddrives in sysinstall. I
choose to install ar0.
Additionally as far as I see ar0 is very susceptible to errors since a
single CRC error can break the RAID consistency is that normal? I
really appreciate those who uses such a kind of RAID1
Regards.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?75a268720901251042p67515b92kda61bc875dcdab97>