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- From: simon@lia.di.epfl.ch (Simon Leinen)
- Newsgroups: comp.unix.admin
- Subject: Re: FDDI, 20+GB unix file partitions, Remote NFS mount IBM to Sun, etc.
- Message-ID: <SIMON.93Jan22125728@liasg2.epfl.ch>
- Date: 22 Jan 93 11:57:27 GMT
- References: <1993Jan17.000702.5794@Princeton.EDU> <1993Jan19.233642.18807@siemens.com>
- <1993Jan21.121428.6925@walter.cray.com>
- Sender: news@disuns2.epfl.ch
- Organization: Ecole Polytechnique Federale de Lausanne
- Lines: 38
- Nntp-Posting-Host: liasg2.epfl.ch
- In-reply-to: cd@bard.uk.cray.com's message of 21 Jan 93 18:14:27 GMT
- X-Md4-Signature: 206e78f36dd6aea1bcc598b5728ba342
-
- In article <1993Jan21.121428.6925@walter.cray.com> cd@bard.uk.cray.com
- (Chris Dickson) writes:
-
- Cray make unix file servers which can access up to 2Tb of disk +
- more or less unlimited 'dmf migrated' data which is offline but
- still accessible using normal unix system calls ( over NFS or
- whatever ). Speed would normally be network- limited for any kind
- of network except HIPPI.
-
- What does "normally" mean? I don't have the impression that this is
- true for our CRAY Y/MP-EL. Here are timings for two copies of the
- same file to two machines on the same FDDI segment of our campus
- network (reachable from my machine over Ethernet and maybe half a mile
- of FDDI backbone). The first one to an NFS filesystem mounted from
- the CRAY:
-
- liasg2[tmp]% time cp /unix ~/nestor
-
- real 23.4
- user 0.0
- sys 0.4
-
- The second one via rcp to a humble DECstation 5100:
-
- liasg2[tmp]% time rcp /unix leinen@cognac:unix
-
- real 6.1
- user 0.1
- sys 0.8
- liasg2[tmp]%
-
- This is during the lunch break. But even late at night the NFS speed
- of the CRAY Y/MP-EL is less than impressive. It is definitely *not*
- limited by network bandwidth.
-
- Cheers,
- --
- Simon.
-