11-12-2008
There's not a huge difference really. What software are you using to perform this mirroring?
To make use of either RAID0+1 or 1+0 you'll need at least 4 disks, do you have that many?
Basically RAID0+1 means that you concatenate two disks first (i.e. RAID0), and then you mirror the two RAID0 volumes (i.e. RAID1).
RAID1+0 is the reverse, i.e. you mirror two pairs of disks, and then you concatenate the two resulting volumes.
The RAID1+0 has some advantages in that if you lose one disk, you only invalidate half of one of the mirrors, so less time is required to resynchronise the data when the disk is replaced. It also means that you can lose one disk on one side, and another disk on the other side without any loss of service.
With RAID0+1, if you lose either disk in one of the concatenated volumes, you lose that whole side until the disk is replaced... which means that if you lose either of the two disks on the other side you have lost your entire volume. Multiple disk failures aren't very common, but they can happen.
So RAID1+0 has slightly better redundancy than RAID0+1. The performance and space efficiency of both is identical.
9 More Discussions You Might Find Interesting
1. Solaris
hai everybody n good morning........here r some queries.......
1. what is the interlace value in RAID 0 (striping.......)
2. How many no of metadevices are required for mirroring and why......... (1 Reply)
Discussion started by: sudhansu
1 Replies
2. Solaris
Somebody can help me ! how can i do mirror in sun ver 8
without third party software !!! (3 Replies)
Discussion started by: goldfelda
3 Replies
3. UNIX for Dummies Questions & Answers
Hi
Can someone tell me what are the differences between software and hardware raid ?
thx for help. (2 Replies)
Discussion started by: presul
2 Replies
4. Solaris
Dear ALl,
I have a RAID 5 volume which is as below
d120 r 60GB c1t2d0s5 c1t3d0s5 c1t4d0s5 c1t5d0s5
d7 r 99GB c1t2d0s0 c1t3d0s0 c1t4d0s0 c1t5d0s0
d110 r 99GB c1t2d0s4 c1t3d0s4 c1t4d0s4 c1t5d0s4
d8 r 99GB c1t2d0s1 c1t3d0s1... (2 Replies)
Discussion started by: jegaraman
2 Replies
5. Solaris
Hello All,
I have read enough of texts on Raid 01 and Raid 10 on solaris :wall: . But no-where found a way to create them using SVM. Some one pls tell me how to do or Post some link if that helps.
TIA
Curious
solarister (1 Reply)
Discussion started by: Solarister
1 Replies
6. AIX
Hello,
I have a scsi pci x raid controller card on which I had created a disk array of 3 disks
when I type lspv ; I used to see 3 physical disks ( two local disks and one raid 5 disk )
suddenly the raid 5 disk array disappeared ; so the hardware engineer thought the problem was with SCSI... (0 Replies)
Discussion started by: filosophizer
0 Replies
7. UNIX for Dummies Questions & Answers
Hi Gurus,
Can any one explain me the difference between hardware RAID and s/w RAID.
Thanks in Advance. (1 Reply)
Discussion started by: rama krishna
1 Replies
8. Solaris
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
9. Red Hat
Hello,
I want to delete a RAID configuration an old server has.
Since i haven't the chance to work with the specific raid controller in the past can you please help me how to perform the configuraiton?
I downloaded IBM ServeRAID Support CD but i wasn't able to configure the video card so i... (0 Replies)
Discussion started by: @dagio
0 Replies
MFI(4) BSD Kernel Interfaces Manual MFI(4)
NAME
mfi -- LSI Logic & Dell MegaRAID SAS RAID controller
SYNOPSIS
mfi* at pci? dev ? function ?
DESCRIPTION
The mfi driver provides support for the MegaRAID SAS family of RAID controllers, including:
- Dell PERC 5/e, PERC 5/i, PERC 6/e, PERC 6/i
- Intel RAID Controller SRCSAS18E, SRCSAS144E
- LSI Logic MegaRAID SAS 8208ELP, MegaRAID SAS 8208XLP, MegaRAID SAS 8300XLP, MegaRAID SAS 8308ELP, MegaRAID SAS 8344ELP, MegaRAID
SAS 8408E, MegaRAID SAS 8480E, MegaRAID SAS 8708ELP, MegaRAID SAS 8888ELP, MegaRAID SAS 8880EM2, MegaRAID SAS 9260-8i
- IBM ServeRAID M1015, ServeRAID M5014
These controllers support RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, RAID 50 and RAID 60 using either SAS or SATA II drives.
Although the controllers are actual RAID controllers, the driver makes them look just like SCSI controllers. All RAID configuration is done
through the controllers' BIOSes.
mfi supports monitoring of the logical disks in the controller through the bioctl(8) and envstat(8) commands.
EVENTS
The mfi driver is able to send events to powerd(8) if a logical drive in the controller is not online. The state-changed event will be sent
to the /etc/powerd/scripts/sensor_drive script when such condition happens.
SEE ALSO
intro(4), pci(4), scsi(4), sd(4), bioctl(8), envstat(8), powerd(8)
HISTORY
The mfi driver first appeared in NetBSD 4.0.
BSD
March 22, 2012 BSD