Faster way: SAN hd to SAN hd copying Post: 303007674

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Special Forums Hardware Filesystems, Disks and Memory Faster way: SAN hd to SAN hd copying Post 303007674 by rbatte1 on Monday 20th of November 2017 05:57:48 AM

11-20-2017

Moderator

When you say 'a faster way', are you trying to move the data from one SAN to another, so that you can detach the original and you need to make the offline time as short as possible?

If your disk is LVM, then you might be better to proceed like this:-

Get the new LUN assigned and re-scan to pick it up if necessary
Make the whole new LUN into an LVM Physical Volume with pvcreate
Add the PV into the volume group containing the data you want to move
Alter the logical volume holding your filesystem/data to have two copies, specifying the new PV as the target. This will take a long time, but the applications remain available because the data is still accessible.
Verify that the logical volume has no errors reported.
Alter the logical volume to have just a single copy, specifying the old SAN device to be removed
Repeat the mirror/drop for as many logical volumes as you need to move to completely free the old PV
Remove the old PV from the volume group
Detach the old LUN from the OS
Detach the old LUN from the SAN side

Using the tools in the OS rather than trying to do the work yourself should be a lot neater. The logical volume is moved, but the filesystem has no idea about it, so all the files remain exactly as they were and your applications, backups or whatever can happily carry on.

I prefer to add a mirror to the new device rather than just execute a move for large logical volumes just in case there are any issues in the process. You don't destroy the original so you can always drop the new copy and start again.

Have I missed the point and waffled on about something irrelevant? My apologies if I have, but I hope that this helps. If you are looking to make another copy to be used separately, then we might be able to use LVM to do that too, but that would be a copy at a fixed point in time that would then go out of date with respect to the original as either is changed (you suggest that there are many concurrent processes working on it)

Anyway, I hope that this helps. Please feel free to correct me if I'm way off target.

Kind regards,
Robin

rbatte1

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LEARN ABOUT HPUX

hbaapi

hbaapi(3C)																hbaapi(3C)

NAME

       hbaapi - Fibre Channel Storage Network Industry Association Host Bus Adapter Application Programming Interface (FC SNIA HBA API)

DESCRIPTION

       The  Common  HBA  API  provides a consistent HBA standard interface for accessing information in a Fibre Channel Storage Area Network (SAN)
       that would be implemented across vendors as a standard 'C' API supported by vendor specific library instances.

       This API library is thread-safe, but threads should not be cancelled when execution is in the API.

       The following functions are available in the API for managing a Fibre Channel HBA.  This API would be exposed to upper  level  applications
       to control SAN functionality.

       Please refer to for details on structures used.

	    01.
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	    FCP Information Functions require that the applications calling them
		  have an effective user id as that of the root user (euid = 0).

	    20.
	    21.
	    22.

	    SCSI Information Functions require that the applications calling them have an effective user id as that of the root user (euid = 0).

	    23.
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FILES

       Contains the related data structures and definitions as in

AUTHOR

       These APIs were developed by Hewlett-Packard Company.

SEE ALSO

       HBA_GetVersion(3C),  HBA_LoadLibrary(3C),  HBA_FreeLibrary(3C),	HBA_GetNumberOfAdapters(3C),  HBA_GetAdapterName(3C), HBA_OpenAdapter(3C),
       HBA_CloseAdapter(3C), HBA_GetAdapterAttributes(3C), HBA_GetAdapterPortAttributes(3C),  HBA_GetPortStatistics(3C),  HBA_GetDiscoveredPortAt-
       tributes(3C),  HBA_GetPortAttributesByWWN(3C),  HBA_SendCTPassThru(3C),	HBA_GetEventBuffer(3C),  HBA_SetRNIDMgmtInfo(3C), HBA_GetRNIDMgmt-
       Info(3C), HBA_SendRNID(3C), HBA_GetFcpTargetMapping(3C), HBA_GetFcpPersistentBinding(3C), HBA_SendScsiInquiry(3C),  HBA_SendReportLUNs(3C),
       HBA_SendReadCapacity(3C), HBA_RefreshInformation(3C), HBA_ResetStatistics(3C).

																	hbaapi(3C)

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