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From: bill@camco.Celestial.COM (Bill Campbell)
Newsgroups: comp.periphs.scsi,comp.periphs
Subject: SLOW WRITE ON OPTICAL ERASABLES
Keywords: OPTICAL, PERFORMANCE
Message-ID: <1080@camco.Celestial.COM>
Date: 14 Jun 91 15:47:25 GMT
Followup-To: comp.periphs.scsi
Organization: Celestial Software, Mercer Island, WA
Lines: 19

I'm in the process of evaluating erasable optical drives.  The
first drive I've installed is a Ricoh RO-5030E2, and I'm
surprised at how slow it is writing.  I ran a short tar job
to compare speeds with ctar's final report.

	ctar -Cvf /mnt/tarfile /bin	# 0.5MB/Min, optical
	ctar -Cvf /tmp/tarfile /bin # 3.1MB/Min, CDC Wren 675MB hd
	ctar -Cvf /dev/rct0 /bin	# 4.1MB/Min, Archive 150MB SCSI tape
	ctar -Cvf /dev/null /bin	# 26.1MB/Min, Maximum possible

Is this typical of erasable write speeds?  I expected them to be
slow, but not this slow!  Even removing a file from a directory
seems to take a long time while it updates the directory entry.

Bill
-- 
INTERNET:  bill@Celestial.COM   Bill Campbell; Celestial Software
UUCP:   ...!thebes!camco!bill   6641 East Mercer Way
             uunet!camco!bill   Mercer Island, WA 98040; (206) 947-5591