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Full Discussion: Healthy mirror on Solaris 10
Operating Systems Solaris Healthy mirror on Solaris 10 Post 302759327 by top.level on Tuesday 22nd of January 2013 04:51:23 AM
Old 01-22-2013
Healthy mirror on Solaris 10

Dear All

I have question and I want some one to answer it ..

in Solaris 10 I have two mirrors as below .. c3t0d0s0 & c3t1d0s0

Code:
        NAME              STATE     READ WRITE CKSUM
        rpool             ONLINE       0     0     0
          mirror-0        ONLINE       0     0     0
            c3t0d0s0      ONLINE       0     0     0
            c3t1d0s0      ONLINE       0     0     0


I'm planning to keep the second mirror which is c3t1d0s0 to have a healthy copy of the OS and I'll detach it and I'll mirror it every week one time to be healthy OS copy for me and fast roster backup for me if any thing happen for the first mirror.

which is mean it'll be all the week detach and in the end of week I'll attache it to have full mirror then I'll detach it again

is there any problem to keep my system running with one mirror and another one will be mirrored every one time every week ?


Pls advice in this regard ..

Last edited by top.level; 01-22-2013 at 05:57 AM..
 

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LVCONVERT(8)						      System Manager's Manual						      LVCONVERT(8)

NAME
lvconvert - convert a logical volume from linear to mirror or snapshot SYNOPSIS
lvconvert -m|--mirrors Mirrors [--mirrorlog {disk|core|mirrored}] [--corelog] [-R|--regionsize MirrorLogRegionSize] [-A|--alloc Allocation- Policy] [-b|--background] [-f|--force] [-i|--interval Seconds] [-h|-?|--help] [--stripes Stripes [-I|--stripesize StripeSize]] [--noude- vsync] [-v|--verbose] [-y|--yes] [--version] LogicalVolume[Path] [PhysicalVolume[Path][:PE[-PE]]...] lvconvert --splitmirrors Images --name SplitLogicalVolumeName MirrorLogicalVolume[Path] [SplittablePhysicalVolume[Path][:PE[-PE]]...] lvconvert -s|--snapshot [-c|--chunksize ChunkSize] [-h|-?|--help] [--noudevsync] [-v|--verbose] [-Z|--zero y|n] [--version] OriginalLogicalVolume[Path] SnapshotLogicalVolume[Path] lvconvert --merge [-b|--background] [-i|--interval Seconds] [-h|-?|--help] [-v|--verbose] [--version] SnapshotLogicalVolume[Path]... lvconvert --repair [-h|-?|--help] [-v|--verbose] [--version] LogicalVolume[Path] [PhysicalVolume[Path]...] DESCRIPTION
lvconvert will change a linear logical volume to a mirror logical volume or to a snapshot of linear volume and vice versa. It is also used to add and remove disk logs from mirror devices. If the conversion requires allocation of physical extents (for example, when converting from linear to mirror) and you specify one or more PhysicalVolumes (optionally with ranges of physical extents), allocation of physical extents will be restricted to these physical extents. If the conversion frees physical extents (for example, when converting from a mirror to a linear, or reducing mirror legs) and you specify one or more PhysicalVolumes, the freed extents come first from the specified PhysicalVolumes. OPTIONS
See lvm for common options. Exactly one of --splitmirrors, --mirrors, --repair, --snapshot or --merge arguments is required. -m, --mirrors Mirrors Specifies the degree of the mirror you wish to create. For example, "-m 1" would convert the original logical volume to a mirror volume with 2-sides; that is, a linear volume plus one copy. --mirrorlog {disk|core|mirrored} Specifies the type of log to use. The default is disk, which is persistent and requires a small amount of storage space, usually on a separate device from the data being mirrored. Core may be useful for short-lived mirrors: It means the mirror is regenerated by copying the data from the first device again every time the device is activated - perhaps, for example, after every reboot. Using "mirrored" will create a persistent log that is itself mirrored. --corelog The optional argument "--corelog" is the same as specifying "--mirrorlog core". -R, --regionsize MirrorLogRegionSize A mirror is divided into regions of this size (in MB), and the mirror log uses this granularity to track which regions are in sync. -b, --background Run the daemon in the background. -i, --interval Seconds Report progress as a percentage at regular intervals. --noudevsync Disable udev synchronisation. The process will not wait for notification from udev. It will continue irrespective of any possible udev processing in the background. You should only use this if udev is not running or has rules that ignore the devices LVM2 cre- ates. --splitmirrors Images The number of redundant Images of a mirror to be split off and used to form a new logical volume. A name must be supplied for the newly-split-off logical volume using the --name argument. -n Name The name to apply to a logical volume which has been split off from a mirror logical volume. -s, --snapshot Create a snapshot from existing logical volume using another existing logical volume as its origin. -c, --chunksize ChunkSize Power of 2 chunk size for the snapshot logical volume between 4k and 512k. -Z, --zero y|n Controls zeroing of the first KB of data in the snapshot. If the volume is read-only the snapshot will not be zeroed. --merge Merges a snapshot into its origin volume. If both the origin and snapshot volume are not open the merge will start immediately. Otherwise, the merge will start the first time either the origin or snapshot are activated and both are closed. Merging a snapshot into an origin that cannot be closed, for example a root filesystem, is deferred until the next time the origin volume is activated. When merging starts, the resulting logical volume will have the origin's name, minor number and UUID. While the merge is in progress, reads or writes to the origin appear as they were directed to the snapshot being merged. When the merge finishes, the merged snapshot is removed. Multiple snapshots may be specified on the commandline or a @tag may be used to specify multiple snap- shots be merged to their respective origin. --repair Repair a mirror after suffering a disk failure. The mirror will be brought back into a consistent state. By default, the original number of mirrors will be restored if possible. Specify -y on the command line to skip the prompts. Use -f if you do not want any replacement. Additionally, you may use --use-policies to use the device replacement policy specified in lvm.conf, viz. activa- tion/mirror_log_fault_policy or activation/mirror_device_fault_policy. Examples "lvconvert -m1 vg00/lvol1" converts the linear logical volume "vg00/lvol1" to a two-way mirror logical volume. "lvconvert --mirrorlog core vg00/lvol1" converts a mirror with a disk log to a mirror with an in-memory log. "lvconvert --mirrorlog disk vg00/lvol1" converts a mirror with an in-memory log to a mirror with a disk log. "lvconvert -m0 vg00/lvol1" converts a mirror logical volume to a linear logical volume. "lvconvert -s vg00/lvol1 vg00/lvol2" converts logical volume "vg00/lvol2" to snapshot of original volume "vg00/lvol1" "lvconvert -m1 vg00/lvol1 /dev/sda:0-15 /dev/sdb:0-15" converts linear logical volume "vg00/lvol1" to a two-way mirror, using physical extents /dev/sda:0-15 and /dev/sdb:0-15 for allocation of new extents. "lvconvert -m0 vg00/lvmirror1 /dev/sda converts mirror logical volume "vg00/lvmirror1" to linear, freeing physical extents from /dev/sda. "lvconvert --merge vg00/lvol1_snap" merges "vg00/lvol1_snap" into its origin. "lvconvert --merge @some_tag" If vg00/lvol1, vg00/lvol2, and vg00/lvol3 are all tagged with "some_tag" each snapshot logical volume will be merged serially, e.g.: vg00/lvol1, then vg00/lvol2, then vg00/lvol3. If --background were used it would start all snapshot logical volume merges in parallel. SEE ALSO
lvm(8), vgcreate(8), lvremove(8), lvrename(8), lvextend(8), lvreduce(8), lvdisplay(8), lvscan(8) Red Hat, Inc LVM TOOLS 2.02.67(2) (2010-06-04) LVCONVERT(8)
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