Re: slow performance on company production server I need help

[Peter Kjellström <cap@xxxxxxxxxx>]

On Wed, 22 Apr 2020 10:53:08 -0500
Christopher Wensink <cwensink@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>Unit     UnitType  Status         %RCmpl  %V/I/M  Port  Stripe
>Size(GB)
>------------------------------------------------------------------------
>u0       RAID-5    OK             -       -       -     256K    11175.8
>u0-0     DISK      OK             -       -       p0    -       1677.28
>u0-1     DISK      OK             -       -       p1    -       1677.28
>u0-2     DISK      OK             -       -       p2    -       1677.28
>u0-3     DISK      OK             -       -       p3    -       1677.28
>u0/v0    Volume    -              -       -       -     -       4096
>u0/v1    Volume    -              -       -       -     -       4096
>u0/v2    Volume    -              -       -       -     -       2983.84

This read: You have 4 physical drives configured as one raid5 array.
The array has three volumes (v0, v1, v2). These three volumes will be
visible as three scsi devices in Linux.

You can use for example lsblk or lsscsi to list them.

Also, you may want to look physically for a battery backup unit (bbu).
The software said there isn't one and that certainly could be a
performance problem (as I would assume the controller turns off write-back
caching).

/Peter
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