[SOLVED] unstable iscsi storage

R

Rafael Carreira

New Member
Dec 28, 2017
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Hello guys,
this is my first post in this forum, sorry for anything

I have a proxmox 5.1-35 host with a remote storage for KVM guests. This storage runs ubuntu server 16.04 and a iscsitarget service. The host uses a LVM storage on top of this iscsi.

We are expecting some instability on the iscsi connection, about 3 or 4 time a day. In these periods, the guests become unresponsive. After a short period (1,2 minutes) everything runs fine again

This is the syslog on given periods:

Dec 27 14:56:49 player01 kernel: [1171593.019023] connection3:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4587781904, last ping 4587766592, now 4587784440
Dec 27 14:56:49 player01 kernel: [1171593.019384] connection3:0: detected conn error (1022)
Dec 27 14:56:49 player01 iscsid: Kernel reported iSCSI connection 3:0 error (1022 - Invalid or unknown error code) state (3)
Dec 27 14:56:52 player01 iscsid: connection3:0 is operational after recovery (1 attempts)

During this issue, we also expect some packet loss
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=897 ttl=63 time=0.255 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=898 ttl=63 time=0.223 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=899 ttl=63 time=0.251 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=900 ttl=63 time=0.245 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=901 ttl=63 time=0.212 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=902 ttl=63 time=0.279 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=903 ttl=63 time=0.432 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=904 ttl=63 time=0.182 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=905 ttl=63 time=0.231 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=906 ttl=63 time=0.227 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=908 ttl=63 time=95.1 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=909 ttl=63 time=102 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=910 ttl=63 time=103 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=916 ttl=63 time=85.3 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=918 ttl=63 time=77.0 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=919 ttl=63 time=103 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=922 ttl=63 time=95.1 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=923 ttl=63 time=79.1 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=924 ttl=63 time=87.7 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=928 ttl=63 time=80.5 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=929 ttl=63 time=96.2 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=931 ttl=63 time=79.0 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=932 ttl=63 time=80.0 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=933 ttl=63 time=84.4 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=934 ttl=63 time=79.4 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=936 ttl=63 time=77.6 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=938 ttl=63 time=118 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=939 ttl=63 time=111 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=943 ttl=63 time=72.3 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=945 ttl=63 time=71.2 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=946 ttl=63 time=72.9 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=947 ttl=63 time=88.0 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=948 ttl=63 time=85.5 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=950 ttl=63 time=72.5 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=953 ttl=63 time=79.7 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=954 ttl=63 time=87.0 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=955 ttl=63 time=90.6 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=956 ttl=63 time=85.4 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=959 ttl=63 time=87.3 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=960 ttl=63 time=80.4 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=961 ttl=63 time=0.736 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=962 ttl=63 time=0.168 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=963 ttl=63 time=0.213 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=964 ttl=63 time=0.244 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=965 ttl=63 time=0.203 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=966 ttl=63 time=1.60 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=967 ttl=63 time=0.226 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=968 ttl=63 time=0.187 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=969 ttl=63 time=0.358 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=970 ttl=63 time=0.253 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=971 ttl=63 time=0.182 ms
64 bytes from XXX.XXX.XXX.XXX: icmp_seq=972 ttl=63 time=0.239 ms

This servers, and the connection run on real IPs, but the latency is usually good (0.2 ms)

We did the same ping test with other server, and the packet loss does not occur. So I don't think this is a network problem.

We also see a gap on host's interface graph, on given periods

transfer.sh
/n141y/img01.png

(I am a new user, I can't post any links...)


Anyone already expect these issues?
Any suggestions?

EDIT:

The problem was the network. Now everything is fine

Thank you!
 
Last edited:
Your network looks overloaded. Check your network monitoring, those peaks should be visible there.
 
The network don't seen too overloaded

transfer.sh
/QVR3x/img2.png

But, if this is the cause, do you think that rate limiting the VMs interfaces would help?
 
Rafael Carreira said:
transfer.sh
/QVR3x/img2.png
Click to expand...
That shows the network from the PVE host, but what about the rest of the network? Any other machines or switches in between? And what does the iscsi host have in its log files?

Rafael Carreira said:
But, if this is the cause, do you think that rate limiting the VMs interfaces would help?
Click to expand...
No, this will just obscure the congestion. So you will notice it later again or on other machines. The network statistic from the server shows not much bandwidth is taken by the server, so it must sit somewhere else on the network (or stack).
 
I didn't found any logs about iscsitarget service.

do you think that tweaking the host's sysctl file would help?

I found a user with similar issues,

serverfault.com
/a/835914

I am thinking about trying these. I will let you know if any of these helps.
 
Sorry for the late response,

I was monitoring the servers and this is the kernel logs on iscsi target

[561242.636149] iscsi_trgt: scsi_cmnd_start(1106) Unsupported 85
[561242.636454] iscsi_trgt: cmnd_skip_pdu(471) 69000000 1c 85 0
[561242.637112] iscsi_trgt: scsi_cmnd_start(1106) Unsupported 85
[561242.637402] iscsi_trgt: cmnd_skip_pdu(471) 6a000000 1c 85 0
[561242.691532] iscsi_trgt: scsi_cmnd_start(1106) Unsupported 85
[561242.691824] iscsi_trgt: cmnd_skip_pdu(471) 59000000 1c 85 0
[561242.692487] iscsi_trgt: scsi_cmnd_start(1106) Unsupported 85
[561242.692780] iscsi_trgt: cmnd_skip_pdu(471) 5a000000 1c 85 0
[567293.658715] iscsi_trgt: scsi_cmnd_start(1106) Unsupported 85
[567293.658999] iscsi_trgt: cmnd_skip_pdu(471) 59000000 1c 85 0
[567293.659770] iscsi_trgt: scsi_cmnd_start(1106) Unsupported 85
[567293.660078] iscsi_trgt: cmnd_skip_pdu(471) 5a000000 1c 85 0
[567294.089393] iscsi_trgt: scsi_cmnd_start(1106) Unsupported 85
[567294.089687] iscsi_trgt: cmnd_skip_pdu(471) 69000000 1c 85 0
[567294.090387] iscsi_trgt: scsi_cmnd_start(1106) Unsupported 85
[567294.090679] iscsi_trgt: cmnd_skip_pdu(471) 6a000000 1c 85 0
[598086.638469] iscsi_trgt: scsi_cmnd_start(1106) Unsupported 41
[598086.638752] iscsi_trgt: cmnd_skip_pdu(471) 58000000 1c 41 512
[802458.519687] perf interrupt took too long (5095 > 5000), lowering kernel.perf_event_max_sample_rate to 25000
[2238498.990284] iscsi_trgt: iscsi_target_create(132) The length of the target name is zero 3
[2353421.679696] iscsi_trgt: Abort Task (01) issued on tid:1 lun:1 by sid:10699347653886464 (Unknown Task)
[2764146.211402] iscsi_trgt: Abort Task (01) issued on tid:1 lun:1 by sid:18299172025074176 (Function Complete)


and this is in the proxmox host
Jan 8 12:03:16 player01 kernel: [2198001.593604] connection4:0: detected conn error (1022)
Jan 8 12:03:24 player01 kernel: [2198009.532081] connection2:0: detected conn error (1022)
Jan 8 12:03:25 player01 kernel: [2198010.807768] connection3:0: detected conn error (1022)
Jan 8 12:03:29 player01 kernel: [2198014.136178] connection1:0: detected conn error (1022)
Jan 8 12:03:44 player01 kernel: [2198029.756462] connection3:0: detected conn error (1022)
Jan 8 12:03:47 player01 kernel: [2198032.056107] connection2:0: detected conn error (1022)
Jan 8 12:03:55 player01 kernel: [2198039.992294] connection4:0: detected conn error (1022)
Jan 8 12:04:06 player01 kernel: [2198051.294539] sd 10:0:0:0: [sdb] Very big device. Trying to use READ CAPACITY(16).
Jan 8 12:04:32 player01 kernel: [2198077.113727] connection4:0: detected conn error (1022)
Jan 8 12:05:04 player01 kernel: [2198109.114192] connection2:0: detected conn error (1022)
Jan 8 12:05:08 player01 kernel: [2198112.980127] sd 7:0:0:0: [sdd] Very big device. Trying to use READ CAPACITY(16).
Jan 8 12:05:08 player01 kernel: [2198113.722181] connection3:0: detected conn error (1022)
Jan 8 12:05:22 player01 kernel: [2198127.802287] connection2:0: detected conn error (1022)
Jan 8 12:05:47 player01 kernel: [2198151.867086] connection2:0: detected conn error (1022)
Jan 8 12:06:03 player01 kernel: [2198167.995316] connection3:0: detected conn error (1022)
Jan 8 12:06:06 player01 kernel: [2198171.323625] connection2:0: detected conn error (1022)
Jan 8 12:06:21 player01 kernel: [2198186.427732] connection2:0: detected conn error (1022)
Jan 8 12:06:22 player01 kernel: [2198187.195619] connection3:0: detected conn error (1022)
Jan 8 12:06:22 player01 kernel: [2198187.195745] sd 9:0:0:1: [sdc] tag#28 FAILED Result: hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK
Jan 8 12:06:22 player01 kernel: [2198187.195750] sd 9:0:0:1: [sdc] tag#28 CDB: Write(16) 8a 00 00 00 00 00 13 ff c1 d8 00 00 00 08 00 00
Jan 8 12:06:22 player01 kernel: [2198187.199991] sd 9:0:0:1: [sdc] tag#4 FAILED Result: hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK
Jan 8 12:06:22 player01 kernel: [2198187.200001] sd 9:0:0:1: [sdc] tag#4 CDB: Write(16) 8a 00 00 00 00 00 15 49 20 a0 00 00 00 90 00 00


I also test the network using another server, and everything looks normal there.

I am thinking that the problem is on the host. Is possible that the host is overloaded and can't handle the network requests?

Some informations about the host

2 x CPU Intel Xeon E5-2420
128 GB RAM

free -h
total used free shared buff/cache available
Mem: 125G 64G 494M 1,2G 61G 59G
Swap: 8,0G 346M 7,7G


load average: 6,99, 6,72, 8,05


Let me know if there is any additional information that would help
 
We are also expecting some vm crashes during this instability periods

kern logs of the vm

Jan 8 13:47:42 mail kernel: [179140.336636] INFO: rcu_sched self-detected stall on CPU
Jan 8 13:47:42 mail kernel: [179140.339656] 1-...: (1 GPs behind) idle=ced/140000000000001/0 softirq=4925076/4925076 fqs=2
Jan 8 13:47:42 mail kernel: [179140.340182] INFO: rcu_sched detected stalls on CPUs/tasks:
Jan 8 13:47:42 mail kernel: [179140.340187] 1-...: (1 GPs behind) idle=ced/140000000000001/0 softirq=4925076/4925076 fqs=2
Jan 8 13:47:42 mail kernel: [179140.340191] (detected by 3, t=20229 jiffies, g=6887934, c=6887933, q=19754)
Jan 8 13:47:42 mail kernel: [179140.340193] Task dump for CPU 1:
Jan 8 13:47:42 mail kernel: [179140.340197] kworker/u8:1 R running task 0 16375 2 0x00000008
Jan 8 13:47:42 mail kernel: [179140.340271] Workqueue: events_freezable_power_ disk_events_workfn
Jan 8 13:47:42 mail kernel: [179140.340276] ffff88023415be18 ffffffff813c1d66 ffff88023415be60 ffffffff81096b60
Jan 8 13:47:42 mail kernel: [179140.340279] 000000003708e400 0000000000000000 ffff88023708e400 ffff88023708e418
Jan 8 13:47:42 mail kernel: [179140.340281] ffff880191c92e70 ffff8802363c3fc0 ffff880191c92e40 ffff88023415bec0
Jan 8 13:47:42 mail kernel: [179140.340282] Call Trace:
Jan 8 13:47:42 mail kernel: [179140.340308] [<ffffffff813c1d66>] ? disk_events_workfn+0x16/0x20
Jan 8 13:47:42 mail kernel: [179140.340349] [<ffffffff81096b60>] process_one_work+0x150/0x3f0
Jan 8 13:47:42 mail kernel: [179140.340354] [<ffffffff810975da>] worker_thread+0x11a/0x480
Jan 8 13:47:42 mail kernel: [179140.340358] [<ffffffff810974c0>] ? rescuer_thread+0x310/0x310
Jan 8 13:47:42 mail kernel: [179140.340361] [<ffffffff8109ce86>] kthread+0xd6/0xf0
Jan 8 13:47:42 mail kernel: [179140.340364] [<ffffffff8109cdb0>] ? kthread_park+0x60/0x60
Jan 8 13:47:42 mail kernel: [179140.340399] [<ffffffff8180f90f>] ret_from_fork+0x3f/0x70
Jan 8 13:47:42 mail kernel: [179140.340403] [<ffffffff8109cdb0>] ? kthread_park+0x60/0x60
Jan 8 13:47:42 mail kernel: [179140.340408] rcu_sched kthread starved for 20227 jiffies! g6887934 c6887933 f0x0 s3 ->state=0x0
Jan 8 13:47:42 mail kernel: [179140.347002] (t=20229 jiffies g=6887934 c=6887933 q=19754)
Jan 8 13:47:42 mail kernel: [179140.348663] Task dump for CPU 1:
Jan 8 13:47:42 mail kernel: [179140.348668] kworker/u8:1 R running task 0 16375 2 0x00000008
Jan 8 13:47:42 mail kernel: [179140.348679] Workqueue: events_freezable_power_ disk_events_workfn
Jan 8 13:47:42 mail kernel: [179140.348683] ffffffff81e54fc0 ffff88023fc83db8 ffffffff810ab2bf 0000000000000001
Jan 8 13:47:42 mail kernel: [179140.348688] ffffffff81e54fc0 ffff88023fc83dd0 ffffffff810adaa9 0000000000000002
Jan 8 13:47:42 mail kernel: [179140.348692] ffff88023fc83e00 ffffffff810e020a ffff88023fc97b40 ffffffff81e54fc0
Jan 8 13:47:42 mail kernel: [179140.348697] Call Trace:
Jan 8 13:47:42 mail kernel: [179140.348714] <IRQ> [<ffffffff810ab2bf>] sched_show_task+0xaf/0x110
Jan 8 13:47:42 mail kernel: [179140.348743] [<ffffffff810adaa9>] dump_cpu_task+0x39/0x40
Jan 8 13:47:42 mail kernel: [179140.348757] [<ffffffff810e020a>] rcu_dump_cpu_stacks+0x8a/0xc0
Jan 8 13:47:42 mail kernel: [179140.348763] [<ffffffff810e3d43>] rcu_check_callbacks+0x4b3/0x7a0
Jan 8 13:47:42 mail kernel: [179140.348769] [<ffffffff810ae551>] ? account_system_time+0x81/0x110
Jan 8 13:47:42 mail kernel: [179140.348774] [<ffffffff810ae7f0>] ? account_process_tick+0x60/0x170
Jan 8 13:47:42 mail kernel: [179140.348812] [<ffffffff810f9490>] ? tick_sched_do_timer+0x30/0x30
Jan 8 13:47:42 mail kernel: [179140.348818] [<ffffffff810e9e29>] update_process_times+0x39/0x60
Jan 8 13:47:42 mail kernel: [179140.348821] [<ffffffff810f8e95>] tick_sched_handle.isra.15+0x25/0x60
Jan 8 13:47:42 mail kernel: [179140.348824] [<ffffffff810f94cd>] tick_sched_timer+0x3d/0x70
Jan 8 13:47:42 mail kernel: [179140.348827] [<ffffffff810ea983>] __hrtimer_run_queues+0xf3/0x260
Jan 8 13:47:42 mail kernel: [179140.348830] [<ffffffff810eae28>] hrtimer_interrupt+0xa8/0x1a0
Jan 8 13:47:42 mail kernel: [179140.348845] [<ffffffff810510e5>] local_apic_timer_interrupt+0x35/0x60
Jan 8 13:47:42 mail kernel: [179140.348857] [<ffffffff8181201d>] smp_apic_timer_interrupt+0x3d/0x50
Jan 8 13:47:42 mail kernel: [179140.348860] [<ffffffff818102e2>] apic_timer_interrupt+0x82/0x90
Jan 8 13:47:42 mail kernel: [179140.348861] <EOI> [<ffffffff8180ef95>] ? _raw_spin_unlock_irqrestore+0x15/0x20
Jan 8 13:47:42 mail kernel: [179140.348895] [<ffffffff815c375d>] ata_scsi_queuecmd+0x15d/0x3e0
Jan 8 13:47:42 mail kernel: [179140.348901] [<ffffffff815bfbf0>] ? ata_scsiop_inq_std+0x150/0x150
Jan 8 13:47:42 mail kernel: [179140.370526] [<ffffffff8159d51b>] scsi_dispatch_cmd+0xab/0x250
Jan 8 13:47:42 mail kernel: [179140.370542] [<ffffffff815a049e>] scsi_request_fn+0x48e/0x630
Jan 8 13:47:42 mail kernel: [179140.370564] [<ffffffff813ad2d3>] __blk_run_queue+0x33/0x40
Jan 8 13:47:42 mail kernel: [179140.370571] [<ffffffff813b66cd>] blk_execute_rq_nowait+0xad/0x160
Jan 8 13:47:42 mail kernel: [179140.370576] [<ffffffff813b6c96>] ? blk_recount_segments+0x56/0x170
Jan 8 13:47:42 mail kernel: [179140.370580] [<ffffffff813b680b>] blk_execute_rq+0x8b/0x140
Jan 8 13:47:42 mail kernel: [179140.370585] [<ffffffff813a71f9>] ? bio_phys_segments+0x19/0x20
Jan 8 13:47:42 mail kernel: [179140.370589] [<ffffffff813b2473>] ? blk_rq_bio_prep+0x63/0x80
Jan 8 13:47:42 mail kernel: [179140.370594] [<ffffffff813b6577>] ? blk_rq_map_kern+0xb7/0x130
Jan 8 13:47:42 mail kernel: [179140.370598] [<ffffffff8159cd03>] scsi_execute+0xd3/0x160
Jan 8 13:47:42 mail kernel: [179140.370602] [<ffffffff8159edae>] scsi_execute_req_flags+0x8e/0xf0
Jan 8 13:47:42 mail kernel: [179140.370608] [<ffffffff815afd47>] sr_check_events+0xb7/0x2a0
Jan 8 13:47:42 mail kernel: [179140.370629] [<ffffffff815ecb58>] cdrom_check_events+0x18/0x30
Jan 8 13:47:42 mail kernel: [179140.370634] [<ffffffff815b018a>] sr_block_check_events+0x2a/0x30
Jan 8 13:47:42 mail kernel: [179140.370640] [<ffffffff813c1c81>] disk_check_events+0x51/0x120
Jan 8 13:47:42 mail kernel: [179140.370644] [<ffffffff813c1d66>] disk_events_workfn+0x16/0x20
Jan 8 13:47:42 mail kernel: [179140.370651] [<ffffffff81096b60>] process_one_work+0x150/0x3f0
Jan 8 13:47:42 mail kernel: [179140.370655] [<ffffffff810975da>] worker_thread+0x11a/0x480
Jan 8 13:47:42 mail kernel: [179140.370659] [<ffffffff810974c0>] ? rescuer_thread+0x310/0x310
Jan 8 13:47:42 mail kernel: [179140.370663] [<ffffffff8109ce86>] kthread+0xd6/0xf0
Jan 8 13:47:42 mail kernel: [179140.370667] [<ffffffff8109cdb0>] ? kthread_park+0x60/0x60
Jan 8 13:47:42 mail kernel: [179140.370672] [<ffffffff8180f90f>] ret_from_fork+0x3f/0x70
Jan 8 13:47:42 mail kernel: [179140.370676] [<ffffffff8109cdb0>] ? kthread_park+0x60/0x60
Jan 8 13:47:57 mail kernel: [179155.608031] sd 2:0:0:0: [sda] tag#14 abort
Jan 8 13:47:57 mail kernel: [179155.613476] sd 2:0:0:0: [sda] tag#13 abort
Jan 8 13:48:28 mail kernel: [179186.870611] sd 2:0:0:0: [sda] tag#12 abort
Jan 8 13:48:28 mail kernel: [179186.877016] sd 2:0:0:0: [sda] tag#11 abort
Jan 8 13:48:28 mail kernel: [179186.877182] sd 2:0:0:0: [sda] tag#10 abort
Jan 8 13:48:28 mail kernel: [179186.877296] sd 2:0:0:0: [sda] tag#3 abort
 
As you are experiencing network issues (see your ping), I suggest to check your network (local and foreign).
 
The problem was really the network
I connected the machines directly and now everything is fine

Thank you for your help
 
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