> of degraded most in the fastest possible time. The bummer with that is > you've got a drive doing nothing most of the time.
mukha ngang ganon ang nangyayari. :( > Yup! Hence the controller BIOS upgrade. yun nga sabi niya... he upgraded the controller. > It has nothing to do with RAID-5. If your controller supports > hot-swapping, you can remove the drive, replace it, and rebuild the > array all in real time. I do this with my 3ware Escalade, too, which > does hardware IDE RAID. You can employ any RAID level you > wish and still > have a hot-spare if you want and still do hot-swapping if you want. > Well... except for RAID-0, since there's no redundancy there. aaah. iba pala yung pagiging raid 5 niya sa pagiging hot swappable. gets ko na. > As I said in my previous email, I highly recommend you > consider RAID-10 > over RAID-5. At the expense of a little usable space, you get better > performance and more reliability. You can keep that > hot-spare, too, for > even more reliability. :) yup. thinking about it na nga pero may overhead kasi. thanks for the info Jijo! fritz <www.mesedilla.com> --- + Basta Ikaw Lord > -----Original Message----- > From: Federico Sevilla III [mailto:[EMAIL PROTECTED] > Sent: Thursday, September 11, 2003 3:31 PM > To: Philippine Linux Users Group Mailing List > Subject: Re: [plug] raid 5 > > > On Thu, Sep 11, 2003 at 12:19:59PM +0800, Fritz Mesedilla wrote: > > Hey Jijo! Long time no hear. :D > > :) > > > Actually, the IBM person who services us recommended raid 5 and > > proceeded to configure the servers for us. hehehe! > > While I admit that most often than not I'd rather do things and let > people watch, I don't think that sort of thing really works. "Teach a > man how to fish", they say. Oh well, it's up to you to learn, then. > > > After this only 4 drives are read by the IBM SCSI manager > as 1 logical > > drive while the other 1 drive is considered swap drive. *scratches > > head* > > > > Does this mean 4 drives are doing the parity thing of raid > 5 while the > > 5th one is ready for swapping? Sabi lang kasi ng IBM tech ready for > > failover na yan. > > This means that you have a four-drive RAID-5 array, with one drive on > standby as a hot-spare. It's ready for failover, meaning if a drive > crashes, the system will automatically rebuild the array using the > hot-spare, which, as I said in the previous email, allows you > to get out > of degraded most in the fastest possible time. The bummer with that is > you've got a drive doing nothing most of the time. > > > Medyo takot lang ako kasi hindi ako yung gumawa ng raid. :D If > > something happens tapos hindi ikaw yung tumira parang > kabado ka di ba. > > Nangyari na kasi dati IBM tech din yung nag configure ng raid 5 test > > server namin tapos 1 drive failed, hinugot ko para palitan... > > nag-crash yung control... parang nalito yung controller. > hehehe. I had > > to rebuild linux install again. The tech guy had to come back and > > flash the scsi controller. > > That sort of attitude (that you have) is what gets people to > learn a new > thing every day. The problem before had nothing to do with > hot-spares or > RAID-5, though. It had everything to do with a flakey controller BIOS, > that the tech guy flashed. So much for love. Kaya nga sabi nila, hindi > purkit naka-RAID ka na eh wala ka nang backup. If you value your data, > back up (is what they always say). :) > > > So I was wondering why it didn't work for me when I tried > hot swapping > > it. Baka may tama lang yung scsi controller? > > Yup! Hence the controller BIOS upgrade. > > > Ok so tama ba ganito? Basta raid 5 hot swappable yung scsi > I can just > > remove the drive and replace it? > > It has nothing to do with RAID-5. If your controller supports > hot-swapping, you can remove the drive, replace it, and rebuild the > array all in real time. I do this with my 3ware Escalade, too, which > does hardware IDE RAID. You can employ any RAID level you > wish and still > have a hot-spare if you want and still do hot-swapping if you want. > Well... except for RAID-0, since there's no redundancy there. > > As I said in my previous email, I highly recommend you > consider RAID-10 > over RAID-5. At the expense of a little usable space, you get better > performance and more reliability. You can keep that > hot-spare, too, for > even more reliability. :) > > --> Jijo > > -- > Federico Sevilla III : http://jijo.free.net.ph : When > we speak of free > Network Administrator : The Leather Collection, Inc. : > software we refer to > GnuPG Key ID : 0x93B746BE : > freedom, not price. > -- > Philippine Linux Users' Group (PLUG) Mailing List > [EMAIL PROTECTED] (#PLUG @ irc.free.net.ph) > Official Website: http://plug.linux.org.ph > Searchable Archives: http://marc.free.net.ph > . > To leave, go to http://lists.q-linux.com/mailman/listinfo/plug > . > Are you a Linux newbie? To join the newbie list, go to > http://lists.q-linux.com/mailman/listinfo/ph-linux-newbie > ---------------------------------------------------------------------- This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. 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