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Operating Systems AIX cannot understand my disk layout Post 302582128 by vjm on Thursday 15th of December 2011 03:29:28 AM
Old 12-15-2011
Hi,

If you have installed sdd drivers instead of sddpcm then you will find the paths are also mentioned as hdisk. You can check which sdd drivers you have installed by
Code:
 lslpp -l | grep -i sdd

if the output is

"devices.sddpcm.53.rte" then all the hdisks are LUN's mapped to your server.

If the output is

"devices.sdd.53.rte" then the paths are also shown as hdisk. (Mine is AIX 5.3)

You can use "lsattr -El hdiskpower6" and look for the "active_hdisk" it will show all the paths connected to that disk. you can get an idea from the below output

Code:
lsattr -El vpath1

& the output is
Code:
"active_hdisk   hdisk4/6005076801900254B800000000000082/fscsi1"
"active_hdisk   hdisk5/6005076801900254B800000000000082/fscsi0"

Hope this helps you.

Regards,

VJMSmilie

---------- Post updated at 01:59 PM ---------- Previous update was at 01:49 PM ----------

Hi,

Mine is ds8k storage. I think you have emc storage so check for the drivers it will help to conclude. From your output it seems hdiskpower0 to 21 are the Luns mapped and the hdisk2 to 47 are paths.
Code:
Pseudo name=hdiskpower0
Symmetrix ID=000192601779
Logical device ID=0109
state=alive; policy=SymmOpt; priority=0; queued-IOs=0
==============================================================================
---------------- Host --------------- - Stor - -- I/O Path - -- Stats ---
### HW Path I/O Paths Interf. Mode State Q-IOs Errors
==============================================================================
1 fscsi3 hdisk26 FA 10gB active alive 0 0
0 fscsi0 hdisk3 FA 7gB active alive 0 0

Pseudo name=hdiskpower1
Symmetrix ID=000192601779
Logical device ID=010A
state=alive; policy=SymmOpt; priority=0; queued-IOs=0
==============================================================================
---------------- Host --------------- - Stor - -- I/O Path - -- Stats ---
### HW Path I/O Paths Interf. Mode State Q-IOs Errors
==============================================================================
1 fscsi3 hdisk27 FA 10gB active alive 0 0
0 fscsi0 hdisk4 FA 7gB active alive 0 0

Regards,
VJMSmilie

Last edited by zaxxon; 12-15-2011 at 05:22 AM.. Reason: added some code tags to the outputs
 

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bup-margin(1)						      General Commands Manual						     bup-margin(1)

NAME
bup-margin - figure out your deduplication safety margin SYNOPSIS
bup margin [options...] DESCRIPTION
bup margin iterates through all objects in your bup repository, calculating the largest number of prefix bits shared between any two entries. This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids. For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45. That means a 46-bit hash would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by its first 46 bits. The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects. Since SHA-1 hashes have 160 bits, that leaves 115 bits of margin. Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits with far fewer objects. If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see if you're getting dangerously close to 160 bits. OPTIONS
--predict Guess the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer from the guess. This is potentially useful for tuning an interpolation search algorithm. --ignore-midx don't use .midx files, use only .idx files. This is only really useful when used with --predict. EXAMPLE
$ bup margin Reading indexes: 100.00% (1612581/1612581), done. 40 40 matching prefix bits 1.94 bits per doubling 120 bits (61.86 doublings) remaining 4.19338e+18 times larger is possible Everyone on earth could have 625878182 data sets like yours, all in one repository, and we would expect 1 object collision. $ bup margin --predict PackIdxList: using 1 index. Reading indexes: 100.00% (1612581/1612581), done. 915 of 1612581 (0.057%) SEE ALSO
bup-midx(1), bup-save(1) BUP
Part of the bup(1) suite. AUTHORS
Avery Pennarun <apenwarr@gmail.com>. Bup unknown- bup-margin(1)
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