What is interlace value in SVM ?

Posted on 2009-05-04
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!
Question by:beer9
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Accepted Solution

omarfarid earned 250 total points
ID: 24301200
please see:

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."

Author Comment

ID: 24307448
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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LVL 40

Expert Comment

ID: 24307553
the link talks about interlace for a stripe and I could see it for device d10
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Author Comment

ID: 24311542
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

ID: 24332578
You are right Omar, d10 is configured as 'stripe' device not 'concatenated' device. Thank :-)

Author Closing Comment

ID: 31577527
Thanks Omar! :-)

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