[SOLVED] Proxmox ZFS Dell R750 unstable

[sahroni]

dear all
I am using Dell R750 with PERC H755 controller, but why is my ZFS unstable..and I have used non Raid (HBA mode), SSD status is fine, but replicated fails and the system is very slow

Is there a controller setting that can be changed or other settings?

Thanks

 

[Lukas Moravek]

Hello @sahroni

In this controller is cache, is disabled ? From the manual is not clear if in HBA is still active.

Lukas

 

[sahroni]

thanks for reply

I haven't checked yet....can it cause that if the cache controller is disabled?

 

[sahroni]

does that mean the Raid controller has to be disabled?

 

[Lukas Moravek]

Opposite, enabled cache can cause problem. There are two policies one for reading and one for writing, ensured that both are disabled.

 

[LnxBil]

What disks are used in there? Are all of them DELL issued enterprise SSDs?

 

[sahroni]

Thank you for your solution, I will check my system configuration.

 

[sahroni]

Where is the setting, sir? Is it in the virtual disk setting?

 

[Lukas Moravek]

Please look for https://dl.dell.com/content/manual6...and-h350-controller-series.pdf?language=en-us

 

[sahroni]

but

Please look for https://dl.dell.com/content/manual6...and-h350-controller-series.pdf?language=en-us

after I read it there was writing like this

"A non–RAID disk is a single disk to the host, and not a RAID volume. The only supported cache policy for non–RAID disks is Write-Through.

 

[sahroni]

this was fine for more than a month...and suddenly it happened...replication error and system became very slow
and my SSD is fine seen in idrac and ZFS status

 

[sahroni]

What disks are used in there? Are all of them DELL issued enterprise SSDs?

I already know the problem... it turns out that the Dell R750 does not tolerate the use of consumer SSDs and must use enterprise SSDs, because previously I had experience using the Dell R630 using consumer SSDs was ok... but not with the R750