write speed.. wooosh!..

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Tony Albers

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May 16, 2019, 8:03:12 AM5/16/19
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Just wanted to share something with you guys (check the dd result):

[root@kac-sto-002 ~]# cat /etc/redhat-release
Springdale Linux release 7.6 (Verona)
[root@kac-sto-002 ~]#
[root@kac-sto-002 ~]# zpool status
  pool: datapool
 state: ONLINE
  scan: none requested
config:

        NAME                            STATE     READ WRITE CKSUM
        datapool                        ONLINE       0     0     0
          raidz1-0                      ONLINE       0     0     0
            wwn-0x50000399187b89ed      ONLINE       0     0     0
            wwn-0x50000399187b8f89      ONLINE       0     0     0
            wwn-0x500003991871e075      ONLINE       0     0     0
            wwn-0x500003991880048d      ONLINE       0     0     0
          raidz1-1                      ONLINE       0     0     0
            wwn-0x50000399187b65f1      ONLINE       0     0     0
            wwn-0x50000399187b9819      ONLINE       0     0     0
            wwn-0x50000399187b9039      ONLINE       0     0     0
            wwn-0x5000039918800479      ONLINE       0     0     0
          raidz1-2                      ONLINE       0     0     0
            wwn-0x50000399187b65a9      ONLINE       0     0     0
            wwn-0x50000399187b8a11      ONLINE       0     0     0
            wwn-0x50000399187bd68d      ONLINE       0     0     0
            wwn-0x50000399187bce4d      ONLINE       0     0     0
          raidz1-3                      ONLINE       0     0     0
            wwn-0x50000399187bd721      ONLINE       0     0     0
            wwn-0x50000399187b65b1      ONLINE       0     0     0
            wwn-0x500003991880387d      ONLINE       0     0     0
            wwn-0x50000399187b9031      ONLINE       0     0     0
        logs
          wwn-0x500080d91129abfe-part1  ONLINE       0     0     0
          wwn-0x500080d91129abd5-part1  ONLINE       0     0     0
        cache
          wwn-0x500080d91129abfe-part2  ONLINE       0     0     0
          wwn-0x500080d91129abd5-part2  ONLINE       0     0     0

errors: No known data errors
[root@kac-sto-002 ~]#
[root@kac-sto-002 ~]#
[root@kac-sto-002 ~]# time dd if=/dev/zero of=/datapool/testfile bs=4M count=20000
20000+0 records in
20000+0 records out
83886080000 bytes (84 GB) copied, 47.4868 s, 1.8 GB/s

real    0m47.493s
user    0m0.062s
sys     0m42.402s
[root@kac-sto-002 ~]#


This is storage for our IBM AC922 PowerAI machines, I suppose that'll have to do.


/tony

Fred Liu

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May 17, 2019, 12:55:46 AM5/17/19
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Decent performance. What is the media in the storage?

Thanks.

Fred
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Tony Albers

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May 18, 2019, 2:53:19 AM5/18/19
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16x 4GB SATA 7200rpm drives for data
2x 240GB SSD for cache and log

In a Dell R740xd 

/tony

Tony Albers

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May 18, 2019, 2:54:32 AM5/18/19
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Oh, and I checked via iostat: It doesn't write to the SSD's during the dd, only the SATA's are active -very active :)

/tony

Fred Liu

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May 18, 2019, 9:11:55 AM5/18/19
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16x4GB?




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Tony Albers

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May 19, 2019, 2:13:02 AM5/19/19
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Heh, very funny.

TB of course, sorry :)

/tony
16x4GB?




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