hdparm -W /dev/xxx should show you
On Mon, 19 Nov 2018 at 12:28 AM, Alex Litvak <alexander.v.litvak@xxxxxxxxx> wrote:
All machines state the same.
/opt/MegaRAID/MegaCli/MegaCli64 -LDGetProp -DskCache -Lall -a0
Adapter 0-VD 0(target id: 0): Disk Write Cache : Disk's Default
Adapter 0-VD 1(target id: 1): Disk Write Cache : Disk's Default
I assume they are all on which is actually bad based on common sense.
https://notesbytom.wordpress.com/2016/10/21/dell-perc-megaraid-disk-cache-policy/
An I couldn't find how to confirm it if it is true but vendor wouldn't ship drives with cache disabled.
I am getting logs in the controller log which are not shown on other servers
11/18/18 8:21:55: C0:SysDma: localAddrPlb 50e03407a0, localAddr e03407a0
11/18/18 8:21:55: C0:SysDma: localAddrPlb 50e03409e0, localAddr e03409e0
11/18/18 8:21:55: C0:SysDma: localAddrPlb 50e0340c20, localAddr e0340c20
11/18/18 8:21:55: C0:SysDma: localAddrPlb 50e0340e60, localAddr e0340e60
11/18/18 8:21:55: C0:SysDma: localAddrPlb 50e03410a0, localAddr e03410a0
11/18/18 8:21:55: C0:SysDma: localAddrPlb 50e03401a0, localAddr e03401a0
Not sure if it has any relation to the issue of latency but search returned nothing substantial.
On 11/18/2018 8:52 AM, Serkan Çoban wrote:
> I am not saying controller cache, you should check ssd disk caches.
> On Sun, Nov 18, 2018 at 11:40 AM Alex Litvak
> <alexander.v.litvak@xxxxxxxxx> wrote:
>>
>> All 3 nodes have this status for SSD mirror. Controller cache is on for all 3.
>>
>> Default Cache Policy: WriteBack, ReadAdaptive, Direct, No Write Cache if Bad BBU
>> Current Cache Policy: WriteBack, ReadAdaptive, Direct, No Write Cache if Bad BBU
>>
>>
>> On 11/18/2018 12:45 AM, Serkan Çoban wrote:
>>> Does write cache on SSDs enabled on three servers? Can you check them?
>>> On Sun, Nov 18, 2018 at 9:05 AM Alex Litvak
>>> <alexander.v.litvak@xxxxxxxxx> wrote:
>>>>
>>>> Raid card for journal disks is Perc H730 (Megaraid), RAID 1, battery back cache is on
>>>>
>>>> Default Cache Policy: WriteBack, ReadAdaptive, Direct, No Write Cache if Bad BBU
>>>> Current Cache Policy: WriteBack, ReadAdaptive, Direct, No Write Cache if Bad BBU
>>>>
>>>> I have 2 other nodes with older Perc H710 and similar SSDs with slightly higher wear (6.3% vs 5.18%) but from observation they hardly hit 1.5 ms on rear occasion
>>>> Cache, RAID, and battery situation is the same.
>>>>
>>>> On 11/17/2018 11:38 PM, Serkan Çoban wrote:
>>>>>> 10ms w_await for SSD is too much. How that SSD is connected to the system? Any raid card installed on this system? What is the raid mode?
>>>>> On Sun, Nov 18, 2018 at 8:25 AM Alex Litvak
>>>>> <alexander.v.litvak@xxxxxxxxx> wrote:
>>>>>>
>>>>>> Here is another snapshot. I wonder if this write io wait is too big
>>>>>> Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
>>>>>> dm-14 0.00 0.00 0.00 23.00 0.00 336.00 29.22 0.34 14.74 0.00 14.74 2.87 6.60
>>>>>> dm-15 0.00 0.00 0.00 16.00 0.00 200.00 25.00 0.01 0.75 0.00 0.75 0.75 1.20
>>>>>> dm-16 0.00 0.00 0.00 17.00 0.00 276.00 32.47 0.25 14.94 0.00 14.94 3.35 5.70
>>>>>> dm-17 0.00 0.00 0.00 17.00 0.00 252.00 29.65 0.32 18.65 0.00 18.65 4.00 6.80
>>>>>> dm-18 0.00 0.00 0.00 15.00 0.00 152.00 20.27 0.25 16.80 0.00 16.80 4.07 6.10
>>>>>> dm-19 0.00 0.00 0.00 13.00 0.00 152.00 23.38 0.21 15.92 0.00 15.92 4.85 6.30
>>>>>> dm-20 0.00 0.00 0.00 20.00 0.00 248.00 24.80 0.27 13.60 0.00 13.60 3.25 6.50
>>>>>> dm-21 0.00 0.00 0.00 17.00 0.00 188.00 22.12 0.27 16.00 0.00 16.00 3.59 6.10
>>>>>> dm-22 0.00 0.00 0.00 20.00 0.00 156.00 15.60 0.11 5.55 0.00 5.55 2.95 5.90
>>>>>> dm-24 0.00 0.00 0.00 8.00 0.00 56.00 14.00 0.12 14.62 0.00 14.62 4.75 3.80
>>>>>> dm-25 0.00 0.00 0.00 19.00 0.00 200.00 21.05 0.21 10.89 0.00 10.89 2.74 5.20
>>>>>>
>>>>>> Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
>>>>>> dm-14 0.00 0.00 0.00 11.00 0.00 136.00 24.73 0.11 9.73 0.00 9.73 1.82 2.00
>>>>>> dm-15 0.00 0.00 0.00 12.00 0.00 136.00 22.67 0.04 3.75 0.00 3.75 1.08 1.30
>>>>>> dm-16 0.00 0.00 0.00 9.00 0.00 104.00 23.11 0.09 10.44 0.00 10.44 2.44 2.20
>>>>>> dm-17 0.00 0.00 0.00 5.00 0.00 160.00 64.00 0.02 4.00 0.00 4.00 4.00 2.00
>>>>>> dm-18 0.00 0.00 0.00 5.00 0.00 52.00 20.80 0.03 5.80 0.00 5.80 3.60 1.80
>>>>>> dm-19 0.00 0.00 0.00 10.00 0.00 104.00 20.80 0.08 7.90 0.00 7.90 2.10 2.10
>>>>>> dm-20 0.00 0.00 0.00 9.00 0.00 132.00 29.33 0.10 11.22 0.00 11.22 2.56 2.30
>>>>>> dm-21 0.00 0.00 0.00 6.00 0.00 68.00 22.67 0.07 12.33 0.00 12.33 3.83 2.30
>>>>>> dm-22 0.00 0.00 0.00 3.00 0.00 20.00 13.33 0.01 3.67 0.00 3.67 3.67 1.10
>>>>>> dm-24 0.00 0.00 0.00 4.00 0.00 24.00 12.00 0.07 18.00 0.00 18.00 5.25 2.10
>>>>>> dm-25 0.00 0.00 0.00 6.00 0.00 64.00 21.33 0.06 10.33 0.00 10.33 3.67 2.20
>>>>>>
>>>>>> Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
>>>>>> dm-14 0.00 0.00 0.00 5.00 0.00 140.00 56.00 0.08 15.20 0.00 15.20 5.40 2.70
>>>>>> dm-15 0.00 0.00 0.00 6.00 0.00 236.00 78.67 0.18 30.67 0.00 30.67 6.83 4.10
>>>>>> dm-16 0.00 0.00 0.00 8.00 0.00 84.00 21.00 0.06 7.25 0.00 7.25 1.62 1.30
>>>>>> dm-17 0.00 0.00 0.00 3.00 0.00 84.00 56.00 0.00 0.33 0.00 0.33 0.33 0.10
>>>>>> dm-18 0.00 0.00 0.00 2.00 0.00 20.00 20.00 0.02 12.00 0.00 12.00 12.00 2.40
>>>>>> dm-19 0.00 0.00 0.00 12.00 0.00 80.00 13.33 0.05 4.00 0.00 4.00 2.33 2.80
>>>>>> dm-20 0.00 0.00 0.00 16.00 0.00 256.00 32.00 0.00 0.06 0.00 0.06 0.06 0.10
>>>>>> dm-21 0.00 0.00 0.00 8.00 0.00 500.00 125.00 0.00 0.12 0.00 0.12 0.12 0.10
>>>>>> dm-22 0.00 0.00 0.00 1.00 0.00 8.00 16.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>> dm-24 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>> dm-25 0.00 0.00 0.00 2.00 0.00 32.00 32.00 0.08 40.00 0.00 40.00 20.50 4.10
>>>>>>
>>>>>> Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
>>>>>> dm-14 0.00 0.00 0.00 10.00 0.00 108.00 21.60 0.11 10.80 0.00 10.80 1.90 1.90
>>>>>> dm-15 0.00 0.00 0.00 5.00 0.00 60.00 24.00 0.03 6.20 0.00 6.20 3.40 1.70
>>>>>> dm-16 0.00 0.00 0.00 6.00 0.00 68.00 22.67 0.00 0.17 0.00 0.17 0.17 0.10
>>>>>> dm-17 0.00 0.00 0.00 7.00 0.00 100.00 28.57 0.09 12.29 0.00 12.29 2.86 2.00
>>>>>> dm-18 0.00 0.00 0.00 5.00 0.00 44.00 17.60 0.07 14.00 0.00 14.00 4.00 2.00
>>>>>> dm-19 0.00 0.00 0.00 2.00 0.00 24.00 24.00 0.03 14.00 0.00 14.00 8.50 1.70
>>>>>> dm-20 0.00 0.00 0.00 7.00 0.00 96.00 27.43 0.07 9.57 0.00 9.57 2.00 1.40
>>>>>> dm-21 0.00 0.00 0.00 7.00 0.00 84.00 24.00 0.12 16.57 0.00 16.57 4.86 3.40
>>>>>> dm-22 0.00 0.00 0.00 5.00 0.00 60.00 24.00 0.05 10.20 0.00 10.20 3.40 1.70
>>>>>> dm-24 0.00 0.00 0.00 2.00 0.00 16.00 16.00 0.03 17.00 0.00 17.00 9.00 1.80
>>>>>> dm-25 0.00 0.00 0.00 4.00 0.00 76.00 38.00 0.05 11.75 0.00 11.75 4.75 1.90
>>>>>>
>>>>>> Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
>>>>>> dm-14 0.00 0.00 0.00 9.00 0.00 104.00 23.11 0.14 15.33 0.00 15.33 4.33 3.90
>>>>>> dm-15 0.00 0.00 0.00 11.00 0.00 128.00 23.27 0.01 0.82 0.00 0.82 0.82 0.90
>>>>>> dm-16 0.00 0.00 0.00 10.00 0.00 120.00 24.00 0.09 9.30 0.00 9.30 3.30 3.30
>>>>>> dm-17 0.00 0.00 0.00 5.00 0.00 72.00 28.80 0.04 8.20 0.00 8.20 8.20 4.10
>>>>>> dm-18 0.00 0.00 0.00 7.00 0.00 68.00 19.43 0.08 11.57 0.00 11.57 6.29 4.40
>>>>>> dm-19 0.00 0.00 0.00 7.00 0.00 76.00 21.71 0.10 13.86 0.00 13.86 6.29 4.40
>>>>>> dm-20 0.00 0.00 0.00 15.00 0.00 176.00 23.47 0.12 7.87 0.00 7.87 1.60 2.40
>>>>>> dm-21 0.00 0.00 0.00 9.00 0.00 112.00 24.89 0.17 18.56 0.00 18.56 6.56 5.90
>>>>>> dm-22 0.00 0.00 0.00 4.00 0.00 56.00 28.00 0.04 10.75 0.00 10.75 7.50 3.00
>>>>>> dm-24 0.00 0.00 0.00 5.00 0.00 532.00 212.80 0.02 4.00 0.00 4.00 3.60 1.80
>>>>>> dm-25 0.00 0.00 0.00 6.00 0.00 60.00 20.00 0.11 19.00 0.00 19.00 7.17 4.30
>>>>>>
>>>>>> Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
>>>>>> dm-14 0.00 0.00 0.00 9.00 0.00 112.00 24.89 0.30 33.22 0.00 33.22 4.33 3.90
>>>>>> dm-15 0.00 0.00 0.00 8.00 0.00 96.00 24.00 0.08 9.88 0.00 9.88 2.62 2.10
>>>>>> dm-16 0.00 0.00 0.00 5.00 0.00 92.00 36.80 0.01 1.80 0.00 1.80 1.80 0.90
>>>>>> dm-17 0.00 0.00 0.00 4.00 0.00 104.00 52.00 0.04 10.00 0.00 10.00 10.00 4.00
>>>>>> dm-18 0.00 0.00 0.00 9.00 0.00 92.00 20.44 0.11 12.00 0.00 12.00 4.44 4.00
>>>>>> dm-19 0.00 0.00 0.00 7.00 0.00 64.00 18.29 0.10 14.43 0.00 14.43 4.00 2.80
>>>>>> dm-20 0.00 0.00 0.00 7.00 0.00 84.00 24.00 0.10 14.00 0.00 14.00 3.71 2.60
>>>>>> dm-21 0.00 0.00 0.00 2.00 0.00 16.00 16.00 0.08 39.50 0.00 39.50 20.50 4.10
>>>>>> dm-22 0.00 0.00 0.00 5.00 0.00 36.00 14.40 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>> dm-24 0.00 0.00 0.00 5.00 0.00 52.00 20.80 0.09 17.20 0.00 17.20 5.40 2.70
>>>>>> dm-25 0.00 0.00 0.00 6.00 0.00 48.00 16.00 0.10 16.00 0.00 16.00 5.50 3.30
>>>>>>
>>>>>> Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
>>>>>> dm-14 0.00 0.00 0.00 5.00 0.00 48.00 19.20 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>> dm-15 0.00 0.00 0.00 5.00 0.00 44.00 17.60 0.01 3.00 0.00 3.00 3.00 1.50
>>>>>> dm-16 0.00 0.00 0.00 3.00 0.00 32.00 21.33 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>> dm-17 0.00 0.00 0.00 4.00 0.00 40.00 20.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>> dm-18 0.00 0.00 0.00 3.00 0.00 32.00 21.33 0.04 13.00 0.00 13.00 6.67 2.00
>>>>>> dm-19 0.00 0.00 0.00 3.00 0.00 28.00 18.67 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>> dm-20 0.00 0.00 0.00 6.00 0.00 64.00 21.33 0.11 17.67 0.00 17.67 3.17 1.90
>>>>>> dm-21 0.00 0.00 0.00 1.00 0.00 12.00 24.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>> dm-22 0.00 0.00 0.00 1.00 0.00 12.00 24.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>> dm-24 0.00 0.00 0.00 3.00 0.00 20.00 13.33 0.00 0.33 0.00 0.33 0.33 0.10
>>>>>> dm-25 0.00 0.00 0.00 6.00 0.00 52.00 17.33 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>
>>>>>> Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
>>>>>> dm-14 0.00 0.00 0.00 18.00 0.00 236.00 26.22 0.42 23.28 0.00 23.28 3.72 6.70
>>>>>> dm-15 0.00 0.00 0.00 15.00 0.00 240.00 32.00 0.12 8.27 0.00 8.27 2.00 3.00
>>>>>> dm-16 0.00 0.00 0.00 10.00 0.00 120.00 24.00 0.23 22.80 0.00 22.80 6.50 6.50
>>>>>> dm-17 0.00 0.00 0.00 6.00 0.00 68.00 22.67 0.06 9.83 0.00 9.83 5.00 3.00
>>>>>> dm-18 0.00 0.00 0.00 12.00 0.00 152.00 25.33 0.10 8.17 0.00 8.17 3.17 3.80
>>>>>> dm-19 0.00 0.00 0.00 12.00 0.00 136.00 22.67 0.14 11.58 0.00 11.58 3.42 4.10
>>>>>> dm-20 0.00 0.00 0.00 19.00 0.00 296.00 31.16 0.20 10.63 0.00 10.63 1.84 3.50
>>>>>> dm-21 0.00 0.00 0.00 14.00 0.00 132.00 18.86 0.17 12.14 0.00 12.14 3.71 5.20
>>>>>> dm-22 0.00 0.00 0.00 10.00 0.00 84.00 16.80 0.12 12.00 0.00 12.00 6.60 6.60
>>>>>> dm-24 0.00 0.00 0.00 5.00 0.00 40.00 16.00 0.10 19.40 0.00 19.40 9.80 4.90
>>>>>> dm-25 0.00 0.00 0.00 9.00 0.00 152.00 33.78 0.08 9.33 0.00 9.33 3.44 3.10
>>>>>>
>>>>>> Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
>>>>>> dm-14 0.00 0.00 0.00 8.00 0.00 112.00 28.00 0.08 9.75 0.00 9.75 3.88 3.10
>>>>>> dm-15 0.00 0.00 0.00 14.00 0.00 156.00 22.29 0.13 9.43 0.00 9.43 2.71 3.80
>>>>>> dm-16 0.00 0.00 0.00 12.00 0.00 132.00 22.00 0.11 8.83 0.00 8.83 2.17 2.60
>>>>>> dm-17 0.00 0.00 0.00 8.00 0.00 116.00 29.00 0.08 10.12 0.00 10.12 4.25 3.40
>>>>>> dm-18 0.00 0.00 0.00 8.00 0.00 100.00 25.00 0.08 9.62 0.00 9.62 5.00 4.00
>>>>>> dm-19 0.00 0.00 0.00 20.00 0.00 212.00 21.20 0.25 12.75 0.00 12.75 2.60 5.20
>>>>>> dm-20 0.00 0.00 0.00 16.00 0.00 168.00 21.00 0.04 2.69 0.00 2.69 0.81 1.30
>>>>>> dm-21 0.00 0.00 0.00 5.00 0.00 48.00 19.20 0.05 10.80 0.00 10.80 7.80 3.90
>>>>>> dm-22 0.00 0.00 0.00 5.00 0.00 52.00 20.80 0.03 6.80 0.00 6.80 3.40 1.70
>>>>>> dm-24 0.00 0.00 0.00 8.00 0.00 60.00 15.00 0.09 11.75 0.00 11.75 2.25 1.80
>>>>>> dm-25 0.00 0.00 0.00 12.00 0.00 160.00 26.67 0.06 5.08 0.00 5.08 1.25 1.50
>>>>>>
>>>>>> On 11/17/2018 10:19 PM, Alex Litvak wrote:
>>>>>>> I stand corrected, I looked at the device iostat, but it was partitioned. Here is a more correct picture of what is going on now.
>>>>>>>
>>>>>>> Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
>>>>>>> dm-14 0.00 0.00 0.00 19.00 0.00 4116.00 433.26 0.01 0.68 0.00 0.68 0.05 0.10
>>>>>>> dm-15 0.00 0.00 0.00 35.00 0.00 8224.00 469.94 0.03 0.86 0.00 0.86 0.06 0.20
>>>>>>> dm-16 0.00 0.00 0.00 53.00 0.00 12428.00 468.98 0.11 2.04 0.00 2.04 0.17 0.90
>>>>>>> dm-17 0.00 0.00 0.00 43.00 0.00 8344.00 388.09 0.09 2.14 0.00 2.14 0.42 1.80
>>>>>>> dm-18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>> dm-19 0.00 0.00 0.00 75.00 0.00 16824.00 448.64 0.08 1.11 0.00 1.11 0.08 0.60
>>>>>>> dm-20 0.00 0.00 0.00 70.00 0.00 16452.00 470.06 0.06 0.90 0.00 0.90 0.09 0.60
>>>>>>> dm-21 0.00 0.00 0.00 18.00 0.00 4112.00 456.89 0.02 1.00 0.00 1.00 0.11 0.20
>>>>>>> dm-22 0.00 0.00 0.00 53.00 0.00 12324.00 465.06 0.06 0.70 0.00 0.70 0.08 0.40
>>>>>>> dm-24 0.00 0.00 0.00 18.00 0.00 4272.00 474.67 0.02 1.06 0.00 1.06 0.17 0.30
>>>>>>> dm-25 0.00 0.00 0.00 74.00 0.00 16916.00 457.19 0.09 1.26 0.00 1.26 0.18 1.30
>>>>>>>
>>>>>>> Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
>>>>>>> dm-14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>> dm-15 0.00 0.00 0.00 17.00 0.00 4108.00 483.29 0.02 1.00 0.00 1.00 0.06 0.10
>>>>>>> dm-16 0.00 0.00 0.00 34.00 0.00 8208.00 482.82 0.03 1.00 0.00 1.00 0.06 0.20
>>>>>>> dm-17 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>> dm-18 0.00 0.00 0.00 36.00 0.00 8220.00 456.67 0.05 1.33 0.00 1.33 0.08 0.30
>>>>>>> dm-19 0.00 0.00 0.00 1.00 0.00 8.00 16.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>> dm-20 0.00 0.00 0.00 36.00 0.00 8288.00 460.44 0.05 1.42 0.00 1.42 0.08 0.30
>>>>>>> dm-21 0.00 0.00 0.00 34.00 0.00 8208.00 482.82 0.03 1.00 0.00 1.00 0.06 0.20
>>>>>>> dm-22 0.00 0.00 0.00 18.00 0.00 4128.00 458.67 0.04 3.22 0.00 3.22 0.17 0.30
>>>>>>> dm-24 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>> dm-25 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>>
>>>>>>> Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
>>>>>>> dm-14 0.00 0.00 0.00 20.00 0.00 4032.00 403.20 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>> dm-15 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>> dm-16 0.00 0.00 0.00 1.00 0.00 20.00 40.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>> dm-17 0.00 0.00 0.00 4.00 0.00 28.00 14.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>> dm-18 0.00 0.00 0.00 3.00 0.00 36.00 24.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>> dm-19 0.00 0.00 0.00 2.00 0.00 20.00 20.00 0.01 2.50 0.00 2.50 2.50 0.50
>>>>>>> dm-20 0.00 0.00 0.00 6.00 0.00 96.00 32.00 0.02 3.33 0.00 3.33 2.00 1.20
>>>>>>> dm-21 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>> dm-22 0.00 0.00 0.00 2.00 0.00 32.00 32.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>> dm-24 0.00 0.00 0.00 22.00 0.00 4184.00 380.36 0.10 4.59 0.00 4.59 0.95 2.10
>>>>>>> dm-25 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>>
>>>>>>> Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
>>>>>>> dm-14 0.00 0.00 0.00 8.00 0.00 1928.00 482.00 0.01 1.00 0.00 1.00 0.12 0.10
>>>>>>> dm-15 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>> dm-16 0.00 0.00 0.00 3.00 0.00 312.00 208.00 0.00 0.33 0.00 0.33 0.33 0.10
>>>>>>> dm-17 0.00 0.00 0.00 18.00 0.00 4264.00 473.78 0.03 1.67 0.00 1.67 0.11 0.20
>>>>>>> dm-18 0.00 0.00 0.00 17.00 0.00 4104.00 482.82 0.03 1.82 0.00 1.82 0.12 0.20
>>>>>>> dm-19 0.00 0.00 0.00 18.00 0.00 4112.00 456.89 0.02 1.06 0.00 1.06 0.11 0.20
>>>>>>> dm-20 0.00 0.00 0.00 32.00 0.00 4308.00 269.25 0.03 0.81 0.00 0.81 0.34 1.10
>>>>>>> dm-21 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>> dm-22 0.00 0.00 0.00 8.00 0.00 540.00 135.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>> dm-24 0.00 0.00 0.00 35.00 0.00 8228.00 470.17 0.03 0.97 0.00 0.97 0.06 0.20
>>>>>>> dm-25 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On 11/17/2018 5:27 PM, John Petrini wrote:
>>>>>>>> The iostat isn't very helpful because there are not many writes. I'd recommend disabling cstates entirely, not sure it's your problem but it's good practice and if your cluster goes as idle as your
>>>>>>>> iostat suggests it could be the culprit.
>>>>>>>>
>>>>>>>>
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>>>>>>>>
>>>>>>
>>>>>>
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