In your case, /dev/md0 is the software RAID device. It's a RAID1 without any errors, using 2 devices, neither of them degraded or with errors. But none of the 2 is a physical device, but they are logical devices inside LVM volume groups. Which physical devices belong to it you'll see by checking the output of vgdisplay.
From my point of view, it's been set up exactly the wrong way around. If a device fails, you'll have to rescue the volume group and logical devices before you'll be able to rescue the RAID. Also, any data not in the RAID will probably be lost, or at least will have to be restored from backup.
Usually, you create a RAID (in hard- or software), on top of which you create logical devices. That way, if a drive fails it's easy to replace, and the LVM won't even notice a part of it went missing for a while.
Good Morning all,
I just have a quick question, on some systems I am working with Software Raid Level 0 devices.
Yes, I know, this is not a good idea, but it was requested :-(
Now, due to a new requirement, I need to add a second internal disk to the system, but with adding the new disk,... (1 Reply)
Hello Lunix people,
I am looking for Raid software or solution besides Veritas. Veritas has some great software but are way too costly. Does anyone know of good raid software that but NOT Veritas. I need the funcations but not the cost. (7 Replies)
Hi all,
I m just trying using software RAID in RHEL 4, without problem , then i wanna simulate if disk 1 is fail (thereis an bootloader), i plug off my 1st disk. My problems is the second disk cannot boot? just stuck in grub, the computer is hang. Sorry for poor concept in RAID? I use a RAID 1.... (0 Replies)
Hi!
A couple of months ago a disk failed in our JBOD cabinett and I have finally got a new disk to replace it with. It was a RAID 0 so we have to create and configure the whole thing again. First we thought of RAID 1+0 but it seems you can't do this with LVM. If you read my last thread, you can... (0 Replies)
Hey,
I have worked with Linux for some time, but have not gotten into the specifics of hard drive tuning or software RAID. This is about to change. I have a Dell PowerEdge T105 at home and I am purchasing the following:
1GBx4 DDR2 ECC PC6400 RAM
Rosewill RSV-5 E-Sata 5 bay disk enclosure... (6 Replies)
hi friends,
I am having issues with adding a spare device to a failed array.
I have created RAID 1 with 3 partitions using mdadm command. Later I added a spare with
mdadm --add /dev/md0 /dev/sdb6
This works fine and when I check this with mdadm --detail command it just sits there as a spare... (7 Replies)
We have configured software based RAID5 with LVM on our RHEL5 servers. Please let us know if its good to configure software RAID on live environment servers. What can be the disadvantages of software RAID against hardware RAID (4 Replies)
Server Model: T5120 with 146G x4 disks.
OS: Solaris 10 - installed on c1t0d0.
Plan to use software raid (veritas volume mgr) on c1t2d0 disk.
After format and label the disk, still not able to detect using vxdiskadm.
Question:
Should I remove the hardware raid on c1t2d0 first?
My... (4 Replies)
Discussion started by: KhawHL
4 Replies
LEARN ABOUT FREEBSD
asr
ASR(4) BSD Kernel Interfaces Manual ASR(4)NAME
asr -- driver for Adaptec I2O based SCSI/ATA host bus adapters
SYNOPSIS
device asr
DESCRIPTION
The Adaptec asr driver provides access to disks and disk arrays controlled by I2O based host bus adapters and SmartRAID SCSI RAID adapters
through the standard SCSI disk da(4) interface.
The supported adapters provide 64 bit PCI, Compact PCI, Zero Channel PCI, and up to four channels of Ultra2, Ultra 160, or Ultra320 SCSI, or
two channels of 1GB Fibre. All support RAID-0, RAID-1, RAID-10, RAID-5 and RAID-50 arrays. All SCSI target types are supported. For the
ATA based controllers, one IDE drive per channel is supported. Hot-swapping of IDE drives is not supported at this time.
All host bus adapters must be configured before they can be used with any operating system. Please contact Adaptec directly to obtain the
latest information on configuration utilities for the adapters. Currently there are both a Motif based GUI configuration utility and a CLI
based configuration utility available from the Adaptec Web site. The cards and arrays can also be configured via the BIOS based configura-
tion tool (SMOR).
HARDWARE
The adapters currently supported by the asr driver include the following:
o Adaptec Zero-Channel SCSI RAID 2000S, 2005S, 2010S, 2015S
o Adaptec SCSI RAID 2100S, 2110S
o Adaptec ATA-100 RAID 2400A
o Adaptec SCSI RAID 3200S, 3210S
o Adaptec SCSI RAID 3400S, 3410S
o Adaptec SmartRAID PM1554
o Adaptec SmartRAID PM1564
o Adaptec SmartRAID PM2554
o Adaptec SmartRAID PM2564
o Adaptec SmartRAID PM2664
o Adaptec SmartRAID PM2754
o Adaptec SmartRAID PM2865
o Adaptec SmartRAID PM3754
o Adaptec SmartRAID PM3755U2B / SmartRAID V Millennium
o Adaptec SmartRAID PM3757
o DEC KZPCC-AC (LVD 1-ch, 4MB or 16MB cache), DEC KZPCC-CE (LVD 3-ch, 64MB cache), DEC KZPCC-XC (LVD 1-ch, 16MB cache), DEC KZPCC-XE (LVD
3-ch, 64MB cache) -- rebadged SmartRAID V Millennium
FILES
/dev/asr* Adaptec SCSI RAID control nodes
NOTES
The ATA based controllers present their devices as SCSI-like devices via CAM. For IDE drives attached to these cards, a subset of standard
SCSI commands and mode pages are understood via translation performed in the card's firmware.
SEE ALSO da(4)HISTORY
The asr (Adaptec SCSI RAID) driver first appeared as the dpti2o driver under BSDi BSD/OS 3.2, then under FreeBSD 2.2.8 and was ported over to
the CAM layer represented in 4.0.
AUTHORS
The asr driver was kindly donated by Adaptec and is maintained by Mark Salyzyn <mark_salyzyn@adaptec.com>. This manual page was written by
Mark Salyzyn and fixed up by Jeroen Ruigrok van der Werven <asmodai@FreeBSD.org>.
BSD July 14, 2004 BSD