[DRBD-user] Hardware-recomendation needed

Digimer lists at alteeve.ca
Fri Mar 30 21:15:32 CEST 2012

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Re: RAID 1; I've used these little adapters quite a bit in production
and have not had any heat problems;


SSDs are nice, but they are not enterprise class (unless you have
serious money). I'd recommend looking at 2x seagate 10k or 15k SAS
drives. Plug those into an LSI 9265-8i with BBU and you will likely find
the performance is quite nice, without inducing the risks of running
into early failure on SSDs.


On 03/29/2012 07:22 AM, Lukas Gradl wrote:
> Hi!
> I'm thinking about a DRBD Installation for one of our sites.
> The hardware are two identical Sandybridge-Xeon boxes with a dedicated,
> direct connection between for DRBD. We're booting of a SSD.
> Harddisks are connected by onboard-SATA 6G.
> OS is Debian Squeeze using DRBD 3.8.10.
> Unfortunatly there's just one 3.5" drive bay available for storage so
> raid is not really an option (perhaps using 2 2.5" HDDs mounted with a
> 2x2.5 to 1x3.5 mounting bracket, but I'm afraid of this setup getting
> too hot despite active cooling in the rack.)
> So as far as i can see, there are four options available:
> 1.) a single SATA-Disk, internal metadata: Played around with that while
> getting familar with DRBD, lousy performance near to unusable.
> 2.) a single SATA-Disk, external metadata on a partition of the
> Boot-SSD. Any experiences on performance using a setup like this?
> 3.) a single SATA SSD, internal metadata: I've read about DRBD not
> supporting TRIM, so I'm afraid the SSD will not work at full performance
> and perhaps die too fast.
> 4.) a single SATA-Disk, connected to a 3Ware 9650SE Raidcontroller,
> using a BBU. Never tried a controller like this with just one disk. How
> much RAM do I need on that controller? Is 128MB sufficient (and I know
> that the more the better, but how much do we really need?)?
> 4a.) two 2.5" SATA Disks, mounted in one 3.5" bay using a 9650SE as
> well. As said before I'm afraid of getting the HDDs too hot.
> Personally I would prefer variant 2 or 3, but I'm not shure about
> performance using these setups.
> So, what do you think about that options?
> regards,
> Lukas

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