>>If you use a hardware RAID controller, stay away from desktop HD!
>>The TLER or ERC is a "must have" to connect your disks to a hardware
>>raid controller
>>Regards,
>>Marco
Yes, I know. But what happens if I use an Enterprise SATA Drive with TLER or ERC
without an RAID Controller? I this case I don't want to use a RAID Controller
just a single Drive connected to a standard SATA Port.
If I use a Desktop Drive in case of an error on the Drive it can take long time
until the Drive is giving up. Can ceph handle that? Or get the "Client" (RBD,CephFS,RadosGW)
errors?
If I use a RAID Drive in case of an error on the Drive it gives up after a short time
and sends a signal to the Controller which a normal SATA Controller don't know about that.
Regards,
Stefan
Il 20/06/2013 17:07, Stefan Schneebeli ha scritto:
> Hi all
>
> I'm building a small ceph cluster with 3 nodes (my first ceph cluster).
> Each Node with one System Disk, one Journal SSD Disk and one SATA OSD
> Disk.
>
> My question is now should I use Desktop or Enterprise SATA Drives?
> Enterprise Drives have a higher MTBF but the Firmware is actually
> build for RAID Controllers
> which have different timing. WD calls that TELR, Seagat*e Error
> Recovery Control (ERC).*
> *In case of an error, they make shure the RAID Controller doesn't
> throw them out of the array*
> *after short time.*
> *
> *
> *Desktop Drives can try seconds to minutes until they give up.*
> *Can Rados/Ceph handle such long time without get answer from the Drive?*
> *Will the Node then marked bad/out from the cluster?*
>
> Thank you in advance for your answers.
>
> Regards,
> Stefan
>
>
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