WD hard drive raid-1 issues
Hello all, We are planning on using RAID-1 to mirror two identical drives. The drives are set up the same in bios, CHS mode with 25228 cylinders, 16 heads, ande 63 sectors each. Linux sees them and shows the same setup as the bios. Linux fdisk on the other hand, shows different setups for the drives. One(hdb) has 1582 cylinders and 255 heads, while the other(hdc) has 25228 cylinders and 16 heads. We were wondering if this was a problem that would be preventative to implementing RAID-1 mirroring, and if so how we can set things right. Thanks, Chris * Chris Brown [EMAIL PROTECTED] !!! HELP FIGHT SPAM !!! Join; www.cauce.org See; spam.abuse.net, spamsucks.com, www.cm.org
Re: WD hard drive raid-1 issues
Hello all, We are planning on using RAID-1 to mirror two identical drives. The drives are set up the same in bios, CHS mode with 25228 cylinders, 16 heads, ande 63 sectors each. Linux sees them and shows the same setup as the bios. Linux fdisk on the other hand, shows different setups for the drives. One(hdb) has 1582 cylinders and 255 heads, while the other(hdc) has 25228 cylinders and 16 heads. We were wondering if this was a problem that would be preventative to implementing RAID-1 mirroring, and if so how we can set things right. I know this may be something you've already looked at but check to see if LBA mode is turned on or off in the bios. -sv
Re: WD hard drive raid-1 issues
On Fri, 2 Apr 1999, Seth Vidal wrote: I know this may be something you've already looked at but check to see if LBA mode is turned on or off in the bios. In addition to doing so, you may wish to clear out the MBR, when LBA is set in BIOS, it writes to the MBR of the disk, doing a: dd if=/dev/zero of=/dev/hd_with_low_cyls_here bs=512 count=1 will resolve that issue, reboot after you do that to be sure that the MBR was cleared... If you have any data you wish to keep, be sure to back it up before you do this, as you will lose all the boot info and partition info on that drive. +---+-+ | [EMAIL PROTECTED] - http://www.best.com/~pfnguyen |Networking, NT | |Perry "Huy" Francis Nguyen | Unix Systems Admin, | +---+Consulting | | 2D 83 93 2C FF 02 A5 97 B6 30 8D 7D BA 8B 85 81 | Applications Devel. | +---+-+
Re: WD hard drive raid-1 issues
To answer your question directly. NO - that's not a problem. In fact, the drives don't even *have* to be the same size. In fact, the drives could even be SCSI and IDE mixed together in the same RAID device. As long as Linux can access the SCSI or IDE drive outside of RAID, then you can use it within RAID, as a rule of thumb. [ David Beccue ] [ [EMAIL PROTECTED] ] [ 888-DBECCUE ] On Fri, 2 Apr 1999, Chris Brown wrote: Hello all, We are planning on using RAID-1 to mirror two identical drives. The drives are set up the same in bios, CHS mode with 25228 cylinders, 16 heads, ande 63 sectors each. Linux sees them and shows the same setup as the bios. Linux fdisk on the other hand, shows different setups for the drives. One(hdb) has 1582 cylinders and 255 heads, while the other(hdc) has 25228 cylinders and 16 heads. We were wondering if this was a problem that would be preventative to implementing RAID-1 mirroring, and if so how we can set things right. Thanks, Chris * Chris Brown [EMAIL PROTECTED] !!! HELP FIGHT SPAM !!! Join; www.cauce.org See; spam.abuse.net, spamsucks.com, www.cm.org
