Isilon：某些节点上的 /var/log 消息会不时显示内存不足消息

Summary: 某些节点上的 /var/log 消息会不时显示以下内存不足 （OOM） 消息：OOM： v_wire_count：2832982、v_active_count：516

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Symptoms

 完整的消息集如下所示：  
2021-08-17T14:40:50.703082+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: OOM: v_wire_count: 2843879, v_active_count: 871
2021-08-17T14:40:50.703246+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: Malloc Pigs:
2021-08-17T14:40:50.703277+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: Type                   InUse   MemUse   Requests
2021-08-17T14:40:50.703303+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: 8kB dinodes           840507  647775K 13330759531
2021-08-17T14:40:50.703325+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: isi_hash               31424   88002K 1548035744
2021-08-17T14:40:50.703344+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: lbm super              17535   84150K    1435677
2021-08-17T14:40:50.703362+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: layout_hints          183473   57336K   22320273
2021-08-17T14:40:50.703379+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: iaddr_set             886694   55419K 5188138062
2021-08-17T14:40:50.703397+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: devbuf                 17379   37840K     184744
2021-08-17T14:40:50.703414+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: newblk                    26   32774K    2364548
2021-08-17T14:40:50.703432+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: bar_owner_vec259         261   32288K    2220148
2021-08-17T14:40:50.703451+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: parent_vec153         218013   27538K    4567646
2021-08-17T14:40:50.703475+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: ddvec84               183471   22840K  177809736
2021-08-17T14:40:50.703496+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: inodedep                  22   16390K    1677902
2021-08-17T14:40:50.703515+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: sysctloid             201426   10989K     201598
2021-08-17T14:40:50.703535+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: vfscache                   4    8241K          4
2021-08-17T14:40:50.703555+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: KTR                        2    7168K          2
2021-08-17T14:40:50.703574+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: ptr_llcb_map           56126    7017K  116151979
2021-08-17T14:40:50.703592+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: Unshown bins account for 84039K
2021-08-17T14:40:50.703611+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: Total: 1219801K
2021-08-17T14:40:50.703630+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: UMA Zalloc Pigs:
2021-08-17T14:40:50.703648+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: ZONE NAME       SIZE     LIMIT     COUNT   MEM USED
2021-08-17T14:40:50.703668+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: mbuf          000256, 06012268, 00017191, 00004297K
2021-08-17T14:40:50.703687+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: socket        000872, 00765000, 00002327, 00001981K
2021-08-17T14:40:50.703704+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: tcpcb         001080, 00765000, 00001652, 00001742K
2021-08-17T14:40:50.703722+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: tcp_inpcb     000488, 00765000, 00001665, 00000793K
2021-08-17T14:40:50.703740+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: udp_inpcb     000488, 00765000, 00000270, 00000128K
2021-08-17T14:40:50.703758+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: unpcb         000192, 00765000, 00000391, 00000073K
2021-08-17T14:40:50.703776+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: hostcache     000096, 00015360, 00000191, 00000017K
2021-08-17T14:40:50.703794+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: udpcb         000032, 00765000, 00000270, 00000008K
2021-08-17T14:40:50.703812+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: clpbuf        001016, 00015872, 00000006, 00000005K
2021-08-17T14:40:50.703832+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: tcptw         000096, 00027767, 00000013, 00000001K
2021-08-17T14:40:50.703853+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: ripcb         000488, 00765000, 00000001, 00000000K
2021-08-17T14:40:50.703872+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: Unshown zones account for 0K
2021-08-17T14:40:50.703890+12:00 <0.4> cluster-1(id1) /boot/kernel.amd64/kernel: Total: 9051K

Cause

OneFS 9.2 中引入的新 OneFS 函数添加了这些消息。
每当pagedaemon无法将可用内存置于free_target以上时，pagedaemon调用pageout函数时，此新函数都会记录内存使用情况信息。
操作系统会主动调用上述函数来记录信息，以防内存进一步不足，并且节点停止响应或死机。

Resolution

重要：
如果节点只有 16 GB RAM，建议用户升级到 64 GB。

如果节点具有 24 GB 或更多 RAM，则在满足以下所有条件时，可以安全地忽略这些消息：

  • /var/log/vmlog 显示可用内存不经常低于 50% 可用目标
  • 群集中没有节点死机重新启动，并且死机字符串中显示BUF_TIMELOCK或其他与 OOM 相关的超时消息
  • 该 freevnodes sysctl 在所有节点上显示已启用（值 1）：
# isi_for_array 'sysctl vfs.vnlru_reuse_freevnodes'

注意：
记得更改 sysctl vfs.vnlru_reuse_freevnodes 如果满足以下所有条件，则返回默认值（0 - 零）：
  • 节点具有 24 GB 或更多物理内存
  • 该 vnlru_reuse_freevnodes=1 最初添加设置是为了解决高 8KB Dinodes 问题
  • OneFS 版本升级到以下级别之一或更高版本：
    • OneFS 9.2.1.25_GA-RUP_2023-12
    • OneFS 9.4.0.17_GA-RUP_2024-02
    • OneFS 9.5.0.7_LTS2023_GA-RUP（2024 年 1 月）
Article Properties
Article Number: 000191515
Article Type: Solution
Last Modified: 03 Apr 2024
Version:  5
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