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聚合大小不在理论计算中

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适用场景

  • 全 SAN 阵列( ASA )
  • ONTAP 9.8

问题描述

两个聚合具有相同的磁盘类型,相同数量的 RAID 组, RAID 组类型以及每个 RAID 组中相同数量的磁盘,但聚合大小不同。

示例: 

  • 集群 1 : ONTAP 9.8P10 ;集群 2 : ONTAP 9.7P17
  • aggr1 和 aggr2 各有 42 个磁盘( 38 个不包括奇偶校验),可用大小 为 33 , 329 , 468 MB ( 38 个磁盘 * 884986 MB/ 磁盘),但聚合大小不同。

cluster1::> node run -node cluster1_nodeA -command sysconfig -r
Aggregate aggr1 (online, raid_dp) (block checksums)
  Plex /aggr1/plex0 (online, normal, active, pool0)
   RAID group /aggr1/plex0/rg0 (normal, block checksums)
    RAID Disk Device      HA  SHELF BAY CHAN Pool Type  RPM  Used (MB/blks)   Phys (MB/blks)
    --------- ------      ------------- ---- ---- ---- ----- --------------   --------------
    dparity   e3b.00.3.0P1   e3b   0   0      0 SSD-NVM   N/A 884986/226556480  884994/226558528
    parity   e3b.01.3.0P1   e3b   1   0      0 SSD-NVM   N/A 884986/226556480  884994/226558528
    data    e3a.00.0.6P1   e3a   0   6      0 SSD-NVM   N/A 884986/226556480  884994/226558528
    data    e3b.01.3.6P1   e3b   1   6      0 SSD-NVM   N/A 884986/226556480  884994/226558528
    ......
   RAID group /aggr1/plex0/rg1 (normal, block checksums)
    RAID Disk Device      HA  SHELF BAY CHAN Pool Type  RPM  Used (MB/blks)   Phys (MB/blks)
    --------- ------      ------------- ---- ---- ---- ----- --------------   --------------
    dparity   e3a.00.0.12P1   e3a   0   12      0 SSD-NVM   N/A 884986/226556480  884994/226558528
    parity   e3b.01.1.12P1   e3b   1   12      0 SSD-NVM   N/A 884986/226556480  884994/226558528
    data    e3a.00.0.18P1   e3a   0   18      0 SSD-NVM   N/A 884986/226556480  884994/226558528
    data    e3b.01.3.16P1   e3b   1   16      0 SSD-NVM   N/A 884986/226556480  884994/226558528

cluster2::*> node run -node cluster2_nodeA -command sysconfig -r
Aggregate aggr2 (online, raid_dp) (block checksums)
  Plex /aggr2/plex0 (online, normal, active, pool0)
   RAID group /aggr2/plex0/rg0 (normal, block checksums)
    RAID Disk Device      HA  SHELF BAY CHAN Pool Type  RPM  Used (MB/blks)   Phys (MB/blks)
    --------- ------      ------------- ---- ---- ---- ----- --------------   --------------
    dparity   e3b.00.1.8P2   e3b   0   8      0 SSD-NVM   N/A 884986/226556480  884994/226558528
    parity   e3b.01.3.7P2   e3b   1   7      0 SSD-NVM   N/A 884986/226556480  884994/226558528
    data    e3b.00.1.1P2   e3b   0   1      0 SSD-NVM   N/A 884986/226556480  884994/226558528
    data    e3b.01.1.1P2   e3b   1   1      0 SSD-NVM   N/A 884986/226556480  884994/226558528
    ......
   RAID group /aggr2/plex0/rg1 (normal, block checksums)
    RAID Disk Device      HA  SHELF BAY CHAN Pool Type  RPM  Used (MB/blks)   Phys (MB/blks)
    --------- ------      ------------- ---- ---- ---- ----- --------------   --------------
    dparity   e3a.00.0.20P2   e3a   0   20      0 SSD-NVM   N/A 884986/226556480  884994/226558528
    parity   e3b.01.1.19P2   e3b   1   19      0 SSD-NVM   N/A 884986/226556480  884994/226558528
    data    e3b.00.3.13P2   e3b   0   13      0 SSD-NVM   N/A 884986/226556480  884994/226558528
    data    e3b.01.1.13P2   e3b   1   13      0 SSD-NVM   N/A 884986/226556480  884994/226558528

  • aggr1 的总大小为 28.86 TB ,而 aggr2 的总大小为 30.47 TB

cluster1::> aggr show -fields diskcount,raidgroups,raidtype,size
aggregate       diskcount raidgroups                 raidtype size
-------------------- --------- ----------------------------------------- -------- ------
aggr3         42     "/aggr3/plex0/rg0 (block)","/aggr3/plex0/rg1 (block)"
                                     raid_dp  28.86TB

cluster2::*> aggr show -fields diskcount,raidgroups,raidtype,size
aggregate       diskcount raidgroups                 raidtype size
-------------------- --------- ----------------------------------------- -------- ------
aggr2         42     "/aggr2/plex0/rg0 (block)","/aggr2/plex0/rg1 (block)"
                                     raid_dp  30.47TB

  • storage aggregate show命令在 aggr1 和 aggr2 上显示不同的 WAFL 预留百分比。

cluster1::*> aggr show -fields wafl-reserve-percent
aggregate       wafl-reserve-percent
-------------------- --------------------
aggr1         10%

cluster2::*> aggr show -fields wafl-reserve-percent
aggregate       wafl-reserve-percent
-------------------- --------------------
aggr2         5%

  • 计算聚合大小。

aggr1 : 33 , 529 , 468 MB * 0.90 ( WAFL 预留为 10% ) = 30 , 266 , 521.2 MB =28.86 TB

Aggr2 : 33 , 529 , 468 MB * 0.95 ( WAFL 预留 5% ) = 31 , 947 , 994.6 MB =30.47 TB

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