SC4 Disk - Tape Transfer Targets

• Link to SC4 blog and disk-disk status page

The disk - tape Tier0 -> Tier1 transfer targets for the SC4 disk - tape throughput phase are:

• 75MB/s per Tier1 site or
• 60MB/s for PIC as per disk - disk target
• 50MB/s for those sites (NDGF, TRIUMF) that have this as their full nominal rate

These are significantly lower than the full nominal rates that sites will later have to support, reduced in order to reflect the current tape technology and infrastructure that is installed.

Full nominal rate tests are officially scheduled for July - to be reviewed based on site acquisition and installation plans as provided to the LCG MB, and on experience with repeated disk - disk tests. (We need to be able to regularly and rapidly achieve disk - disk transfers at or above full nominal).

Reported Daily Average Rates to Tape

• The site by site reports are also summarised in a table below.

CNAF

Estimated Overall Rate to Tape (from Tue Apr 19 to Thu Apr 27): 76.94 MB/s

Estimated Daily Rate to Tape (MB/s):

SARA

BNL

See summary plots here.

The following is the plot of BNL's tape transfer rate:

• April 19
• April 20
• Summary since Apr 19

CNAF

CNAF has switched to tape testing on Apr 19 at 6 p.m. So far, we downloaded 18 TB, which gives an average rate to tape - over approx. 47 hours - of 106 MB/s

Update (Apr 28): Estimated Overall Rate to Tape (from Tue Apr 19 to Thu Apr 27): 76.94 MB/s (6 tape drives in use)

Monitoring pages for migration to tape with Castor2 still under implementation.

Detailed daily averages in table at the bottom of this page.

TRIUMF

Available here.

RAL

USCMS

For USCMS: All times based on Chicago days.

Wed 4/19: 105 MB/s accepted from CERN 105 MB/s written to tape for 15.5hrs duration

Thu 4/20: 115 MB/s accepted from CERN 100 MB/s written to tape STK silo down for repair for several hours - data buffered

Fri 4/21: 90 MB/s accepted from CERN for 14 hrs. 115 MB/s written to tape (buffered data from previous day)

Sat 4/22: Cooling outage

Sun 4/23: Cooling outage

Mon 4/24: 115 MB/s accepted from CERN and written to tape, over 17 hours

Tue 4/25: 80 MB/s accepted from CERN and written to tape

Site Monitoring

• FNAL hour view - day view
• IN2P3

GridView Monitoring