The WD drives are a family that comes in either 18TB or 16TB sizes while
the Seagate model comes in 16TB-10TB sizes, this would indicate that the
WD drives have higher density or might be based on newer technology. The
WD drives have a 512MB cache while the Seagate drives have 256MB cache;
The increased cache may provide additional performance in a wider
variety of applications.
As far as Dell is concerned, a 16TB 7.2k SAS drive is a commodity part
where one model/brand is as good as another, even if the replacement
part is a model based on technology several years older or newer than
the original.
https://www.seagate.com/files/www-content/datasheets/pdfs/exos-x16-DS2011-3-2008US-en_US.pdf
https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/product/data-center-drives/ultrastar-dc-hc500-series/product-manual-ultrastar-dc-hc550-sas-oem-spec.pdf
--Blake
On 5/18/2021 11:57 AM, Paul Raines wrote:
I did firmware updates of everything in the lifecycle controller
as the first thing I did when I booted before making the RAIDs
so all firmware levels should be the same.
The disks are different brands it appears. Not sure why that
happened as we ordered these at the same time.
The first, slower box has ST16000NM010G 16TB drives and
the second, faster box has WUH721816AL5200 16TB drives.
A suprising difference to have different brands of disks but I am also
suprised it makes such a big difference in the init rates if
that really is the cause.
I guess I will open a ticket will Dell support.
-- Paul Raines (http://help.nmr.mgh.harvard.edu)
On Tue, 18 May 2021 11:42am, Blake Hudson wrote:
External Email - Use Caution One explanation might be that the
disks are not identical. Dell will sometimes ship different model
drives depending on availability, or the drives could have come with
a different firmware version installed. You might check with perccli
to see if this is a possibility.
Also, some manufacturers may re-use the same model number to indicate
a drive of X capacity for X usage, but the internals for the drive
could change from year to year (WD is known for this). Something to
check if the drives report a subtly different model number, different
date of manufacture/location of manufacture, or have different style
labels or fonts from one server to another.
--Blake
On 5/18/2021 9:20 AM, Paul Raines wrote:
I recently bought two identical PowerEdge T640 with internal PERC
H730P
Adapter and eighteen 16TB disks. I created a 17 disk RAID6 with 1 hot
spare on both.
On the 1st server I created the RAID Sunday (May 16 16:20:13)
and on the 2nd server I creatd it Monday (May 17 11:23:45)
As of right now the 1st server RAID reports 9% complete while
the 2nd server RAID reports 50% complete. Which is crazy since
the 1st has been running almost half a day longer!
I checked the BGI rate on both which are both the default 30%
There is no other activity on either server going on as I am
waiting for the init to finish.
I can find no errors or other clues in the logs I know to check.
All other aspects of the RAIDs are good (all disks report good)
A comparison of 'perccli64 /c0 show all' between the two shows
no differences in any settings.
Simple random-write 'fio' tests on both show slightly slower
on the first server compared to the second but only about 10-15%
Anyone have any clues as to why the huge slowness on the
initialization on the first server?
---------------------------------------------------------------
Paul Raines
http://secure-web.cisco.com/1fi3qgfk-20nJoYU6te9gK96dQIHMd77NtVCeh7fdRY0c3np7SJPrz8MIamuhl0s9lDN5Nx_lHHmy1eJDtAefyetl4hGPSWd46VHPOK2CPYuo_LKowp9vEBZmjIGgve7zXiFm3eaPK2MRhRXWmfXBYb2-0GBkd4Y9TJkc_sZaKixj1hH_xDybnpG2HAZ4UQKfhXKLKxximvTvbkAApqsg9qlQZEw5IafpAuygxQJz-pd9WvubRaTT3d7O7Efjh_A5U544DVsbIKFOLMnmosoBFQ/http%3A%2F%2Fhelp.nmr.mgh.harvard.edu
MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging
149 (2301) 13th Street Charlestown, MA 02129 USA
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