Re: [opensuse] Re: Spec'ing a 50 TB dedicated storage subsystem and room to grow?

On 02/25/2018 02:21 PM, Greg Freemyer wrote:

On Sun, Feb 25, 2018 at 1:01 PM, Lew Wolfgang wrote:

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On 02/25/2018 09:42 AM, L A Walsh wrote:

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The sas enclosures can be daisy chained for up to 8 enclosures (might be more), so could have 192tB of storage w/4tB disks.

BTW, I've been using Seagate 10-TB disks and they've been quite reliable and fast. They don't do the shingled recording thing either. Lew,

The only 10TB I have bought were shingled and from time to time very slow.

I check the detailed specs and with Seagate and determined that they aren't shingled.  We purchased 7 of them for testing before buying more.  Configured as a six-disk RAID6 array with a hotspare we get about 1.6-GB/sec write rates.  This is with lots 4-GB files of random data.  I can get more measurements tomorrow if you're interested.   We have another system with a 23-disk RAID 6 array using the 10-TB disks that I can't access now. This is with an LSI SAS 9380-8e controller with the SAS versions of the disks.

is it the helium-filled you're buying?

Yes.  The cover is welded in place.

Also, do you have thoughts of SAS v SATA for a busy fileserver?

I've been told that SAS is better for a busy server, but I never took the time to quantify the difference.  But note that you can get 12-Gb/sec with SAS, but only 6-Gb/sec with SATA. So that might make a difference. For the record, we use SuperMicro 4U chassis. The newest server is the one I can't reach right now, it has five of the 4U slave chassis, and one 4U with the processor. The slaves have 44 3.5-in hotswap bays, but we haven't filled them all yet.  Each slave chassis has its own LSI RAID controller with battery cache backup.  It's a monster of a system.  I'll get some numbers tomorrow. Regards, Lew -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org