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Disk mirroring
Post 60921 by malcom on Tuesday 25th of January 2005 04:10:56 AM
01-25-2005
Disk mirroring
Good Morning 
I have a new challenge to solve, I am going to write a new backup disk mirroring script. The current one, whcih is useing 'dd' caused some stalled systems
Currently I am in the phase of experimenting with different methods, I was thinking about dump/restore afio/cpio or rsync.
The best solution looks like rsync for me, but what os your opinion ?
The script will run 1 time a week and has to mirror the complete OS disk to a second 'backup' disk. Only the OS FS will be backed up, no data filesystems !
The backup will run on a live system, I cannot go down to sinle user mode and/or remount the FS readonly for backing up
With 'dd' the Linux system will be forced to flush all dirty pages, which caused the stalled situation I described before. So I need a mirror method with doesn't cause a extremly high load, because the systems are high loaded anyway and is more or less fast; of course I could need hours for it, but it should be finished the next morning
Thanks for all hints !
Btw, the systems are RH AS 2.1 systems, IA64 multi processor and big RAM. The disks are default SCSI disks (36 or 72 GB), primary and backup disks have a seperate controller each. The shell is free choosable, I thought on bash.
Cheers
malcom
I have a new challenge to solve, I am going to write a new backup disk mirroring script. The current one, whcih is useing 'dd' caused some stalled systems
Currently I am in the phase of experimenting with different methods, I was thinking about dump/restore afio/cpio or rsync.
The best solution looks like rsync for me, but what os your opinion ?
The script will run 1 time a week and has to mirror the complete OS disk to a second 'backup' disk. Only the OS FS will be backed up, no data filesystems !
The backup will run on a live system, I cannot go down to sinle user mode and/or remount the FS readonly for backing up
With 'dd' the Linux system will be forced to flush all dirty pages, which caused the stalled situation I described before. So I need a mirror method with doesn't cause a extremly high load, because the systems are high loaded anyway and is more or less fast; of course I could need hours for it, but it should be finished the next morning
Thanks for all hints !
Btw, the systems are RH AS 2.1 systems, IA64 multi processor and big RAM. The disks are default SCSI disks (36 or 72 GB), primary and backup disks have a seperate controller each. The shell is free choosable, I thought on bash.
Cheers
malcom
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LEARN ABOUT NETBSD
fssconfig
FSSCONFIG(8) BSD System Manager's Manual FSSCONFIG(8) NAME
fssconfig -- configure file system snapshot devices SYNOPSIS
fssconfig [-cxv] device path backup [cluster [size]] fssconfig -u [-v] device fssconfig -l [-v] [device] DESCRIPTION
The fssconfig command configures file system snapshot pseudo disk devices. It will associate the file system snapshot disk device with a snapshot of path allowing the latter to be accessed as though it were a disk. If backup resides on the snapshotted file system a persistent snapshot will be created. This snapshot is active until backup is unlinked. This snapshot mode is only supported for ffs files systems. Otherwise data written through the path will be saved in backup. If backup is a regular file, it will be created with length size. Default size is the size of path. Data is saved to backup in units of cluster bytes. Options indicate an action to be performed: -c Configures the device. If successful, references to device will access the contents of path at the time the snapshot was taken. If backup is a directory, a temporary file will be created in this directory. This file will be unlinked on exit. -l List the snapshot devices and indicate which ones are in use. If a specific device is given, then only that will be described. -u Unconfigures the device. -v Be more verbose listing the snapshot devices. -x Unlink backup after the device is configured. If no action option is given, -c is assumed. FILES
/dev/rfss? /dev/fss? EXAMPLES
fssconfig fss0 /usr /tmp/back Configures the snapshot device fss0 for a snapshot of the /usr file system. Data written through /usr will be backed up in /tmp/back. fssconfig fss1 / /dev/rsd0e 8192 Configures the snapshot device fss1 for a snapshot of the / file system. Data written through / will be backed up in /dev/rsd0e. The backup will take place in units of 8192 bytes. fssconfig -u fss0 Unconfigures the fss0 device. SEE ALSO
opendisk(3), fss(4), mount(8), umount(8) HISTORY
The fssconfig command appeared in NetBSD 2.0. BSD
June 11, 2012 BSD