Christopher,

> [root@daisy cron.daily]# tw_cli /c8 show

> Unit  UnitType  Status         %RCmpl  %V/I/M  Stripe  Size(GB)  Cache 
> AVrfy
> ------------------------------------------------------------------------------
> u0    RAID-5    OK             -       -       256K    11175.8   Ri ON

> VPort Status         Unit Size      Type  Phy Encl-Slot    Model
> ------------------------------------------------------------------------------
> p0    OK             u0   3.63 TB   SATA  0   -            WDC
> WD4005FZBX-00K5
> p1    OK             u0   3.63 TB   SATA  1   -            WDC
> WD4005FZBX-00K5
> p2    OK             u0   3.63 TB   SATA  2   -            WDC
> WD4005FZBX-00K5
> p3    OK             u0   3.63 TB   SATA  3   -            WDC
> WD4005FZBX-00K5

you are running your RAID-controller without BBU and without write
caching. (see the Ri statement)

I get

tw_cli /c0 show

Unit  UnitType  Status         %RCmpl  %V/I/M  Stripe  Size(GB)  Cache  AVrfy
------------------------------------------------------------------------------
u0    RAID-6    OK             -       -       256K    16763.7   RiW    ON

VPort Status         Unit Size      Type  Phy Encl-Slot    Model
------------------------------------------------------------------------------
p0    OK             u0   2.73 TB   SATA  0   -            WDC WD30EURS-63SPKY0
p1    OK             u0   2.73 TB   SATA  1   -            WDC WD30EURS-63R8UY0
p2    OK             u0   2.73 TB   SATA  2   -            WDC WD30EURS-63SPKY0
p3    OK             u0   2.73 TB   SATA  3   -            WDC WD30EURS-63SPKY0
p4    OK             u0   2.73 TB   SATA  4   -            WDC WD30EURS-63SPKY0
p5    OK             u0   2.73 TB   SATA  5   -            WDC WD30EURS-63SPKY0
p6    OK             u0   2.73 TB   SATA  6   -            WDC WD30EURS-63SPKY0
p7    OK             u0   2.73 TB   SATA  7   -            WDC WD30EURS-63SPKY0

Name  OnlineState  BBUReady  Status    Volt     Temp     Hours  LastCapTest
---------------------------------------------------------------------------
bbu   On           Yes       OK        OK       OK       197    31-Dec-2019

with the same type of controllers. When I did the initial
installation, I found that the write caching makes a VERY big
difference in my mailserver application. However, you might have get
problems finding a matching BBU these days if your controller is not
very recent. And depending on where you are located and how good your
power supply is, you don't want to activate write caching without a
BBU.

cheers,
---
Michael Schumacher


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