- Community Home
- >
- Storage
- >
- Midrange and Enterprise Storage
- >
- HPE 3PAR StoreServ Storage
- >
- Re: SSMC 3.7 Service Time Calculation not correct
Categories
Company
Local Language
Forums
Discussions
Forums
- Data Protection and Retention
- Entry Storage Systems
- Legacy
- Midrange and Enterprise Storage
- Storage Networking
- HPE Nimble Storage
Discussions
Discussions
Discussions
Forums
Discussions
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
- BladeSystem Infrastructure and Application Solutions
- Appliance Servers
- Alpha Servers
- BackOffice Products
- Internet Products
- HPE 9000 and HPE e3000 Servers
- Networking
- Netservers
- Secure OS Software for Linux
- Server Management (Insight Manager 7)
- Windows Server 2003
- Operating System - Tru64 Unix
- ProLiant Deployment and Provisioning
- Linux-Based Community / Regional
- Microsoft System Center Integration
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Community
Resources
Forums
Blogs
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
12-09-2020 11:21 PM
12-09-2020 11:21 PM
SSMC 3.7 Service Time Calculation not correct
Dear All,
Just want to check if you are facing the same issue with me.
I'm using SSMC 3.7.
when I to open the VV performance chart seems like the service time total, not properly calculated from read and write. from screenshot below the formula should be read + write = total service time. but the total seems wrong.
Kindly need your advice on this.
Thanks in advance
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
12-11-2020 04:12 AM
12-11-2020 04:12 AM
Re: SSMC 3.7 Service Time Calculation not correct
Hi Rapadila,
I will review this and get back to you.
Regards,
Srinivas Bhat
I am an HPE Employee
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
01-04-2021 12:44 AM
01-04-2021 12:44 AM
Re: SSMC 3.7 Service Time Calculation not correct
Hi Rapadila,
Can you please share below command outputs to understand the VV details:
showvv (vv_name)
showvv -d (vv_name)
showvv -cpgalloc (vv_name)
Regards,
Srinivas Bhat
I am an HPE Employee
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
01-05-2021 05:00 PM
01-05-2021 05:00 PM
Re: SSMC 3.7 Service Time Calculation not correct
Hi Shrinivas,
thank you for looking on to this issue.
Below are the result. I think its the SSMC shown incorrectly, It is not only happen on 1 VV, but it is happen on all VV.
I have 3 array connected to the same SSMC and all the result seems not right.
3PARXXXXX cli% showvv UDC1DEV01_3PAR02_07
-Rsvd(MiB)- -(MiB)-
Id Name Prov Compr Dedup Type CopyOf BsId Rd -Detailed_State- Snp Usr VSize
108 UDC1DEV01_3PAR02_07 tpvv No No base --- 108 RW normal 0 1381376 4194304
-------------------------------------------------------------------------------------------------
1 total 0 1381376 4194304
3PARXXXXX cli% showvv -d UDC1DEV01_3PAR02_07
Id Name Rd Mstr Prnt Roch Rwch PPrnt SPrnt PBlkRemain -------------VV_WWN------------- -----CreationTime------ Udid
108 UDC1DEV01_3PAR02_07 RW 2/0/1 --- --- --- --- -- -- 60002AC0000000000000006C00020518 2018-04-05 21:24:20 WIB 108
------------------------------------------------------------------------------------------------------------------------------------
1 total 0
3PARXXXXX cli% showvv -cpgalloc UDC1DEV01_3PAR02_07
Id Name Prov Compr Dedup Type UsrCPG SnpCPG
108 UDC1DEV01_3PAR02_07 tpvv No No base AO2_CPG_SAS10K1.8TB_R6 --
---------------------------------------------------------------------------
1 total
StatVV result
07:56:37 01/06/2021 r/w I/O per second KBytes per sec Svt ms IOSz KB
VVname Cur Avg Max Cur Avg Max Cur Avg Cur Avg Qlen
UDC1DEV01_3PAR02_07 t 12 18 34 51 479 1324 0.786 0.532 4.2 27.0 0
-------------------------------------------------------------------------------
1 t 12 18 51 479 0.786 0.532 4.2 27.0 0
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
01-08-2021 03:26 AM
01-08-2021 03:26 AM
Re: SSMC 3.7 Service Time Calculation not correct
Hi Rapadila,
Thanks for the details. I will review this in lab and get back to you.
Regards,
Srinivas Bhat
I am an HPE Employee
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
02-05-2021 09:21 AM
02-05-2021 09:21 AM
Re: SSMC 3.7 Service Time Calculation not correct
Hi Rapadila,
Sorry for the delayed response on this. I tried to dig down a lot about this. I referred several HPE documents, our lab systems, some of the previously downloaded volume performance reports and also few demonstration videos. Everywhere the 'Total service time' value is always in between the 'read service time' and 'write service time'. But there is no mathematical calculation available on how Total service time is derived with reference to read and write service times. Surely total service time is not the total of read and write like how it is in IOPs and bandwidth reports. Total service time doesn't look like mathematically related to read and write service times.
At every instance, total service time relatively differs from read and write service times. All three look like independent values. What has been constant is, the total service time value is always between read and write service time values.
Regards,
Srinivas Bhat
I am an HPE Employee
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
02-09-2021 09:52 PM
02-09-2021 09:52 PM
Re: SSMC 3.7 Service Time Calculation not correct
I think that it IS mathematically related to read and write service times, but it would not be mathematically correct to just add write and read servicetime. You have to take into account the numer of read and write iops as well - e.g.one write io at 100ms and 500 read ios at 2ms does NOt result in 102 or 51ms total service time. Total Service time is probably not the plain arithmetic average, but the weighted arithmetic average. Something like
((1 x 100) + (500 x 2)) / (1 + 500)
I guess - never calculated it on my own...