atom feed37 messages in org.freebsd.freebsd-hackersRe: Frustration with SCSI system
FromSent OnAttachments
Rick HamellSep 19, 2000 5:35 am 
Rick HamellSep 19, 2000 8:42 am 
Alfred PerlsteinSep 20, 2000 12:51 pm 
Edward ElhaugeSep 20, 2000 12:58 pm 
Wilko BulteSep 20, 2000 12:59 pm 
Marc TardifSep 20, 2000 1:08 pm 
Wilko BulteSep 20, 2000 1:18 pm 
David ScheidtSep 20, 2000 1:20 pm 
Alfred PerlsteinSep 20, 2000 1:23 pm 
Edward ElhaugeSep 20, 2000 1:24 pm 
Fred CliftSep 20, 2000 1:34 pm 
Bernd WalterSep 20, 2000 1:43 pm 
Alfred PerlsteinSep 20, 2000 1:47 pm 
Nick RognessSep 20, 2000 1:48 pm 
Matthew JacobSep 20, 2000 1:55 pm 
Bernd WalterSep 20, 2000 2:26 pm 
Aleksandr A.BabaylovSep 20, 2000 2:55 pm 
Warner LoshSep 20, 2000 3:01 pm 
Warner LoshSep 20, 2000 3:02 pm 
David ScheidtSep 20, 2000 3:28 pm 
Aleksandr A.BabaylovSep 20, 2000 3:50 pm 
Sergey BabkinSep 20, 2000 5:47 pm 
MikeSep 20, 2000 6:09 pm 
David ScheidtSep 20, 2000 6:50 pm 
Aleksandr A.BabaylovSep 20, 2000 8:58 pm 
Keith KempSep 21, 2000 3:28 pm 
Douglas SwarinSep 21, 2000 4:23 pm 
Warner LoshSep 21, 2000 4:44 pm 
Sergey BabkinSep 21, 2000 5:08 pm 
Joe GrecoSep 21, 2000 7:32 pm 
Joe GrecoSep 21, 2000 7:37 pm 
Douglas SwarinSep 21, 2000 10:26 pm 
jdb-...@layer8.netSep 21, 2000 11:55 pm 
Adrian ChaddSep 22, 2000 7:23 am 
Wes PetersSep 22, 2000 10:41 pm 
Warner LoshSep 23, 2000 8:21 am 
Andreas KlemmOct 3, 2000 11:18 am 
Subject:Re: Frustration with SCSI system
From:Warner Losh (im@village.org)
Date:Sep 21, 2000 4:44:10 pm
List:org.freebsd.freebsd-hackers

In message <2000@staff.texas.net> Douglas Swarin writes: : Ideally, I would use one of the IDE flash-based drives on the market. One : brand is SanDisk, and they take a standard IDE connector and fit into a : 3.5" drive bay. You can get them very reasonably priced up to 128MB or : so, which is just fine for a boot partition. Since flash drives have no : moving parts, mechanical failure is not an issue, and since the root : partition is not written to much, the flash will not wear out for a : long time (flash cells wear out after about 100,000 writes; the flash : drives do load balancing and stuff to ensure that the (many) cells in : the drive are written to evenly).

We use these devices heavily at Timing Solutions. Or rather we use a IDE <-> CF adapter and haven't had any devices wear out. And some of these devices have had rather heavy use. I think that it is closer to 1 million writes per cell, but I don't have my spec sheets handy.

Are you sure that they do write balancing? The indications I have from the base chip technology is that they don't. I could have missed that in the data sheets. It has been a little while since I looked at them, so I might be misremembering. I can't seem to find the data sheets I looked at before.

In any event, this works well. I usually have / be read only. This can be practacle if you don't have any users that desire to change their passwords... Since I have serveral machines that have an extremely limited number of users on, this works well. One can also mount / rw if you need to do maintenance on it for whatever reason.

Warner

To Unsubscribe: send mail to majo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message