Skip to main content
NetApp adopts Microsoft’s Business-to-Customer (B2C) Identity Management
Effective December 3 - NetApp adopts Microsoft’s Business-to-Customer (B2C) identity management to simplify and provide secure access to NetApp resources. For accounts that did not pre-register (prior to Dec 3) access to your NetApp data may take up to 1 hour as your legacy NSS ID is synchronized to the new B2C identity. To learn more, Read the FAQ and Watch the video. Need assistance? Complete this form and select “Registration Issue” as the Feedback Category. 
NetApp Knowledge Base

E-Series direct attached 12 Gb SAS performance degradation and long initialization

Views:
160
Visibility:
Public
Votes:
2
Category:
e-series-systems
Specialty:
esg
Last Updated:

Applies to

  • E2824
  • TOSHIBA (Type: AL15SEB120N Firmware MS00)

Issue

  1. Initial setup of RAID 6 Volume Group of 6 HDD takes 10 Hours other disk type takes 3 hours
  2. Initial performance testing of the volume group does not meet sequential write performance expectations
  3. Errors in major event log during volume group creation and Host multipath errors disabling write cache
Examples:
Host multipath driver configuration error detected - Host abc <--CRITICAL
Cache database mismatch has been detected - Shelf 99, Bay B
 
$ fio --name=test --filesize=10G --directory=/mnt/fio --bs=2M --nrfiles=1 --direct=1 --sync=0 --randrepeat=0 --rw=read --refill_buffers --end_fsync=1 --iodepth=1 --ioengine=sync --runtime=30s --numjobs=4
READ: bw=873MiB/s (916MB/s), 210MiB/s-243MiB/s (220MB/s-255MB/s), io=25.6GiB (27.5GB), run=30001-30007msec

Sequential READ/WRITE 50/50 (2MiB blocks) test with 4 processes:
$ fio --name=test --filesize=10G --directory=/mnt/fio --bs=2M --nrfiles=1 --direct=1 --sync=0 --randrepeat=0 --rw=rw --refill_buffers --end_fsync=1 --iodepth=1 --ioengine=sync --runtime=30s --numjobs=4
READ: bw=285MiB/s (299MB/s), 67.5MiB/s-73.1MiB/s (70.8MB/s-76.6MB/s), io=8562MiB (8978MB), run=30021-30038msec
WRITE: bw=280MiB/s (293MB/s), 68.4MiB/s-73.8MiB/s (71.7MB/s-77.4MB/s), io=8402MiB (8810MB), run=30021-30038msec

Sequential WRITE (2MiB blocks) test with 4 processes
$ fio --name=test --filesize=10G --directory=/mnt/fio --bs=2M --nrfiles=1 --direct=1 --sync=0 --randrepeat=0 --rw=write --refill_buffers --end_fsync=1 --iodepth=1 --ioengine=sync --runtime=30s --numjobs=4
WRITE: bw=215MiB/s (226MB/s), 49.3MiB/s-65.7MiB/s (51.7MB/s-68.9MB/s), io=6468MiB (6782MB), run=30005-30073msec

 

 

CUSTOMER EXCLUSIVE CONTENT

Registered NetApp customers get unlimited access to our dynamic Knowledge Base.

New authoritative content is published and updated each day by our team of experts.

Current Customer or Partner?

Sign In for unlimited access

New to NetApp?

Learn more about our award-winning Support