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What is interlace value in SVM ?

Posted on 2009-05-04
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Last Modified: 2013-12-27
Do we use interlace value only in 'striping' or in 'mirror' also? Also I do not see 'interlace' value in 'soft partition'. Thanks!
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Question by:beer9
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omarfarid earned 250 total points
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please see:

http://blogs.sun.com/tonyn/entry/svm_default_interlace_and_resync
http://docsun.cites.uiuc.edu/sun_docs/C/solaris_9/SUNWaadm/LOGVOLMGRADMIN/p15.html

from 2nd link:

"An interlace is the size, in Kbytes, Mbytes, or blocks, of the logical data segments on a stripe. Depending on the application, different interlace values can increase performance for your configuration. The performance increase comes from having several disk arms doing I/O. When the I/O request is larger than the interlace size, you might get better performance."
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by:beer9
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I created a test, stripe, concatenation and mirror, and I am able to see 'interlace' value set only in the 'concatenation'. So the interlace value is applicable to the 'concatenation' device only?
bash-3.00# metastat

d23: Mirror

    Submirror 0: d11

      State: Okay

    Submirror 1: d12

      State: Okay

    Pass: 1

    Read option: roundrobin (default)

    Write option: parallel (default)

    Size: 204800 blocks (100 MB)
 

d11: Submirror of d23

    State: Okay

    Size: 204800 blocks (100 MB)

    Stripe 0:

        Device   Start Block  Dbase        State Reloc Hot Spare

        c0d1s5          0     No            Okay   Yes
 
 

d12: Submirror of d23

    State: Okay

    Size: 204800 blocks (100 MB)

    Stripe 0:

        Device   Start Block  Dbase        State Reloc Hot Spare

        c0d1s6          0     No            Okay   Yes
 
 

d10: Concat/Stripe

    Size: 147456 blocks (72 MB)

    Stripe 0: (interlace: 32 blocks)

        Device   Start Block  Dbase     Reloc

        c0d1s3      28672     Yes       Yes

        c0d1s4          0     No        Yes
 

d99: Concat/Stripe

    Size: 2048000 blocks (1000 MB)

    Stripe 0:

        Device   Start Block  Dbase     Reloc

        c0d1s0          0     No        Yes

    Stripe 1:

        Device   Start Block  Dbase     Reloc

        c0d1s1          0     No        Yes
 

Device Relocation Information:

Device   Reloc  Device ID

c0d1   Yes      id1,cmdk@AVBOX_HARDDISK=VBa4a10e74-e93db827

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by:omarfarid
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the link talks about interlace for a stripe and I could see it for device d10
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by:beer9
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d10 I configured as concatenated device only...
sh-3.00# metastat -p

d23 -m d11 d12 1

d11 1 1 c0d1s5

d12 1 1 c0d1s6

d10 1 2 c0d1s3 c0d1s4 -i 32b

d99 2 1 c0d1s0 \

         1 c0d1s1

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Author Comment

by:beer9
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You are right Omar, d10 is configured as 'stripe' device not 'concatenated' device. Thank :-)
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Author Closing Comment

by:beer9
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Thanks Omar! :-)
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