Date: Fri, 7 Jun 1996 12:28:22 -0700 (PDT) From: Dror Matalon <dror@hopf.dnai.com> To: freebsd-isp@freebsd.org, freebsd-scsi@freebsd.org Subject: Re: ERROR info:747d9d asc:11,0 Unrecovered read ...other SCSI issues Message-ID: <Pine.NEB.3.93.960607114715.9403K-100000@mars.dnai.com>
next in thread | raw e-mail | index | archive | help
Michael Dillon <michael@memra.com> says: >News servers eat drives. No matter what type of drive, they just wear out >and die. Yes, I guess I knew that, although our web server is doing plenty of disk io too. >Computer room??? How about the case where the drives are? Most clone cases >have NO (that's zero) airflow engineering done. The only way to be sure >that the drives are running cool enough (especially 7200 RPM drives) is to >mount them with space in between (an inch or so) and mount extra fans that >blow air across the top of the drive. When you open the case and remove >the bad drive, stick your finger on top. If it burns so badly that it >blisters, you need more cooling. Even if it's only hot, add more airflow >anyway. I'll look at that, although I think I'll try some other testing methodology. > >room that you need to put on a sweater when you go in. It also helps to >use RAID (http://www.mylex.com DAC960SI) because it lessens the physical >activity on any one drive to some extent. And the special fans to blow air >across the top of each individual drive. The nice thing about a DAC960 is >that with a proper hot-swap chassis and RAID 5, replacing a drive doesn't >shut anything down. I'd love using some kind of RAID solution. So far I haven't found anything that I really like, and that has been tested. Are you using the mylex RAID? I looked at it a while ago and it sounded like an interesting solution, but I first wanted to hear about other people using it. I also understand that there are some problems with the freebsd utilities handling large (20 Gig and more) disks, they report negative sizes etc (32 bit problem?). I actually think that someone could make nice bucks, by putting together a FreeBsd box with redundant Power supplies, fans, Scsi controllers etc and make it a, relatively, cheap NFS appliance. As for the disk with the SCSI errors, we're just replacing it with a new one. Thanks for all the replies and help, Dror Dror Matalon Voice: 510 649-6110 Direct Network Access Fax: 510 649-7130 2039 Shattuck Avenue Modem: 510 649-6116 Berkeley, CA 94704 Email: dror@dnai.com
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.NEB.3.93.960607114715.9403K-100000>