08-13-2011
Hi.
Quote:
Originally Posted by
otheus
Though I always found md to be stable, the Linux world seems to have fixated on the much more flexible (and thoroughly documented) Volume Management (LVM) tools. Should you recover, consider a rebuild with LVM. There are more steps and there is a learning curve involved, but these are
Outweighed by the ability to get support.
I thought that I had read some time ago, that LVM on top of MD was a good solution. In fact, that is what I had done the last time I installed Linux on a standalone machine (not a VM) recently.
One reference provides some of the background:
RAID verses LVM - Stack Overflow
Some other sources, mainly for the procedures of installing LVM on top of MD:
Setup Software Raid 1 with LVM on Linux ,
https://wiki.archlinux.org/index.php...re_RAID_or_LVM ,
Some performance numbers are available at
https://raid.wiki.kernel.org/index.php/Linux_Raid
I don't recall seeing advice to shift over to RAID via LVM as opposed to MD. One reason (for me) is that MD has the ability to do RAID10, and (so far) LVM does only RAID0 and RAID1. Also grub has not traditionally understood LVM, so the boot partition cannot be LVM.
However, I have used rsync to backup LVM partitions and it makes use of snapshots to do the work -- very nice feature so that you don't need to take down the machine to backup.
cheers, drl
10 More Discussions You Might Find Interesting
1. Solaris
Hi,
I've recently mirrored the 4 disks in a V440. Disks 0 + 1 have been mirrored with hardware mirroring using the command raidctl -c c1t0d0 c1t2d0, the other 2 disks have been mirrored using Soltisce Disk Suite. I know how to check the progress for the SDS mirroring but how can I find the... (2 Replies)
Discussion started by: Chains
2 Replies
2. Solaris
Hello Gurus!!
Very recently i tried to mount a USB pen drive onto my solaris 10 (X4170 model) server. As i understand, in ideal scenarios it should get mounted automatically, but it did not happen. Neither anything is shown in "iostat -En" output or "rmformat -l" about the pen drive.
I also... (10 Replies)
Discussion started by: EmbedUX
10 Replies
3. UNIX for Advanced & Expert Users
Hello, I have 4 drives (500G each) in a raid 10, I got a power failior and this is the result?
cat /proc/mdstat
Personalities :
md126 : inactive sdb sdc sdd sde
1953536528 blocks super external:-md127/0
md127 : inactive sdd(S) sde(S) sdb(S) sdc(S)
9028 blocks super... (3 Replies)
Discussion started by: rmokros
3 Replies
4. UNIX for Advanced & Expert Users
Hi everyone,
I am not sure if I understand how mdadm --create /dev/md0 --level=container works?
A device called /dev/md0 appears in /proc/mdstat but I am not sure how to use that device?
I have 2 blank drives with 1 500GB partition on each. I would like to setup mirroring, but not in the... (0 Replies)
Discussion started by: hytron
0 Replies
5. Debian
Trying to mount an external 160GB Toshiba drive but....
this is my dmesg tail output:
usb 2-2: new high speed USB device using ehci_hcd and address 3
usb 2-2: New USB device found, idVendor=13fd, idProduct=1618
usb 2-2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 2-2:... (4 Replies)
Discussion started by: Ridson
4 Replies
6. Red Hat
had this RHEL 5 installation with /dev/sda1 and /dev/sda2 running..
created two more partitions /dev/sdj1 and /dev/sdj2 , the same sized partition as /dev/sda
trying to use mdadm to create RAID1 ..
I cannot even do it in "rescue" mode, I wonder if it can be done..
it kept... (2 Replies)
Discussion started by: ppchu99
2 Replies
7. UNIX for Dummies Questions & Answers
Hi
I am using SUSE 11 linux
I have couple of "nfs" entries in /etc/fstab which are automatically loaded after system restart.
One of the entry is windows drive mounted using cifs as shown below
//IP-Address/Partition /mnt/x cifs credentials=/creds/.creds,rw,uid=<name> 0 0
I want to... (1 Reply)
Discussion started by: rakeshkumar
1 Replies
8. Filesystems, Disks and Memory
Hello,
i have a system with 6 sata3 seagate st3000dm01 disks running on stable Debian with software raid mdadm. i have md0 for root and md1 for swap and md2 for the files. i now want to add one more disk = sdh4 for md2 but i got this errors:
The new disk is connected to an 4 port sata... (7 Replies)
Discussion started by: Sunghost
7 Replies
9. Solaris
I am connecting a USB mass storage removeable drive to Solaris 10 x86 machine.
The device is detected and i am able to perform standard read and write functions.
But i want to use a code to send IOCTL based SCSI commands to the same device to read and write the data. Which i am unable to do so.... (17 Replies)
Discussion started by: danish2012
17 Replies
10. Solaris
Hi fellow members!
I have a oracle solaris server with two internal disks, that acts as an authentication server only, and for now the server seems to be doing its job, but when typing metastat -c I get some notifications.
I am not familiar with SVM, I wonder if someone can help me on this:... (3 Replies)
Discussion started by: fretagi
3 Replies
PVCK(8) System Manager's Manual PVCK(8)
NAME
pvck - check physical volume metadata
SYNOPSIS
pvck [-d|--debug] [-h|--help] [-v|--verbose] [--labelsector] PhysicalVolume [PhysicalVolume...]
DESCRIPTION
pvck checks physical volume LVM metadata for consistency.
OPTIONS
See lvm for common options.
--labelsector sector
By default, 4 sectors of PhysicalVolume are scanned for an LVM label, starting at sector 0. This parameter allows you to specify a
different starting sector for the scan and is useful for recovery situations. For example, suppose the partition table is corrupted
or lost on /dev/sda, but you suspect there was an LVM partition at approximately 100 MB. This area of the disk may be scanned by
using the --labelsector parameter with a value of 204800 (100 * 1024 * 1024 / 512 = 204800):
pvck --labelsector 204800 /dev/sda
Note that a script can be used with --labelsector to automate the process of finding LVM labels.
SEE ALSO
lvm(8), pvcreate(8), pvscan(8) vgck(8)
Sistina Software UK LVM TOOLS 2.02.95(2) (2012-03-06) PVCK(8)