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09-02-2005 02:56 AM
09-02-2005 02:56 AM
Solved! Go to Solution.
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09-02-2005 03:25 AM
09-02-2005 03:25 AM
SolutionVMS does not have a native striping solution, where striping is defined as chunks of files alternating between disks.
VMS does support BOUND VOLUME SETS, which present a single starting point, but where files are transparently allocated from multiple drives.
Could is be that you just mean BIND, not STRIPE? If you really mean stripe, then please expaling which tool you were using for that.
If a single disk in a bound set is lost, then you effectivly lost the whole set, allthough it is theoretically possible to 'find' up-to-date, and valid files on the remaining members. But this is likely to be more trouble than it is worth. So you'll need to restore all.
The sequence then becomes something like:
init dua9 data1
init dua10 data2
mount/bind=data dua9:,dua10: data1,data2
backup ...
Check HELP MOUNT and HELP INIT for details.
hth,
Hein.
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09-02-2005 04:26 AM
09-02-2005 04:26 AM
Re: Striped datasets
1. As Hein said, you might have a BIND set rather than a striped set. A striped set of 2 disks would have 100% of the data from each disk on the other. A striped set of two has no advantages. As Hein said if you lose one disk you lose it all. Even though BIND sets are allowed, personnally, I think they are best avoided. Your data gets spread across disks. Again if you lose one disk of the set, I believe the whole set becomes unavailable since the data is spread across the disks. Generally, for 2 disks you would use shadowing (also called mirroring) rather than striping.
2. A minimum of 3 disks is required for true striping to have a benefit. The data from each disk is spread across the other disks. So the data from disk 1 is also 50% on disk 2 and 50% on disk 3.
3. On VMS, striping is usually done with a RAID (Redundant Array of Independent Disks) Controller. Raid disk names start with DR.
4. From your description, it sounds like you have a BACKUP saveset of HRB.BCK. If that is the case, then the disk volume name is HRB.
Do: $SHOW LOG/SYS DISK*
What are the logical names for $5$DUA9: and $5$DUA10:?
Lawrence
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09-02-2005 04:28 AM
09-02-2005 04:28 AM
Re: Striped datasets
http://h71000.www7.hp.com/wizard/wiz_2581.html
http://h71000.www7.hp.com/wizard/wiz_8948.html
Purely Personal Opinion
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09-02-2005 04:41 AM
09-02-2005 04:41 AM
Re: Striped datasets
I think you might try HELP STRIPE on your system if it is up and running. And do a
SEARCH SYS$SYSROOT:[*...]*.com STRIPE for possible remnants of command procedures that might have been used to initialize the stripeset in the past.
You might GOOGLE VAX VMS STRIPESET too.
Robert
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09-02-2005 04:44 AM
09-02-2005 04:44 AM
Re: Striped datasets
http://www.sysworks.com.au/disk$vaxdocsep002/sysman/d3zkaaa1.p7.bkb#1
Polycenter Striping for OpenVMS VAX
Enjoy,
Robert
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09-02-2005 05:49 AM
09-02-2005 05:49 AM
Re: Striped datasets
You might also see what you have in your SYS$HELP: directory -- you may have some release notes and possibly even HTML files.
Robert
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09-02-2005 01:48 PM
09-02-2005 01:48 PM
Re: Striped datasets
Striping is definitely NOT the same as a Mirror set.
RAID 0 is striping. In effect the logical volume is broken into stripes, and the stripes are alternated between the two physical drives. There is no redundancy inherant in this approach. This gives higher bandwidth performance than is achievable with a single disk.
RAID 1 is mirroring. In RAID 1, each of the disks has a complete copy of the data. It is common to combine mirroring and striping in a configuration referred to as RAID 0/1.
There are other RAID configurations possible, but these are the only ones under this thread.
Bound volume sets, when carefully managed, work very well. Under normal conditions, a given file is kept on a single volume. Files are extended across different volumes when there is an absolute shortage of space.
I hope that the above information is helpful.
- Bob Gezelter, http://www.rlgsc.com
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09-05-2005 12:45 PM
09-05-2005 12:45 PM
Re: Striped datasets
RA90's? Wow, 9" drives 1.2GB capacity and probably consume the price of a new 100GB disk drive in electricity & aircon every quarter! I guess you must be stuck with them?
If you're really using RAID, the command to create a stripe set is
$ RAID INIT/RAID=0 volname dev1,dev2,...devn
where "volname" is the name of the volume, dev1..devn are the physical devices to be striped. For example:
$ RAID INIT/RAID=0 MYSTRIPE $5$DUA9:,$5$DUA10:
This is a one off operation. BEWARE it will destroy any data on the physical devices.
To use the stripeset, you need to BIND it to a virtual device, DPAnnn: For example:
$ RAID BIND MYSTRIPE $5$DUA9:,$5$DUA10: DPA9:
First time you do this, I think you need to INIT the DPA device:
$ INIT DPA9: MYSRIPE
Finally, you mount the virtual device:
$ MOUNT/CLUSTER DPA9: MYSTRIPE
If you don't have DPA devices on your system, then you're either using 3rd party RAID software, or you're using bound volume sets.
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09-05-2005 01:04 PM
09-05-2005 01:04 PM
Re: Striped datasets
Q
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09-06-2005 04:50 AM
09-06-2005 04:50 AM
Re: Striped datasets
Lawrence
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09-06-2005 05:04 AM
09-06-2005 05:04 AM
Re: Striped datasets
A 2 member stripe set has almost the full capacity of the combined available capacity of the 2 stripeset members. A 2 member shadowset has only the capacity of the smallest of its 2 members available. There are people who use 2 member stripesets -- regardless of whether or not this makes sense from a reliability standpoint.
Personally, I would rather have a combination that is more reliable, like a stripeset of members made up of shadowsets or raid5+3 raidsets for a "plaid" arrangement. I prefer that when using raid to build up multidevice virtual volumes that that they be able to survive the failure of a single physical device and allow for hot replacement of that device.
Robert
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09-06-2005 05:06 AM
09-06-2005 05:06 AM
Re: Striped datasets
Running Raid 0 in a Production environment is a single point failure waiting to happen unless the disks are also shadowed. In this instance there is no indication that the disks are shadowed.
Lawrence
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09-06-2005 05:10 AM
09-06-2005 05:10 AM
Re: Striped datasets
Lawrence