Hello, cooker. linux 2.4.17 raidtools-0.90-11mdk
raiddev /dev/md2 raid-level 5 nr-raid-disks 4 nr-spare-disks 0 persistent-superblock 0 chunk-size 4 parity-algorithm left-symmetric device /dev/loop0 raid-disk 0 device /dev/loop1 raid-disk 1 device /dev/loop2 raid-disk 2 device /dev/loop3 raid-disk 3 after creating test raid5 array on loop devices, i run mkraid, raidstop, raidstart. [root@backupsrv /home]# cat /proc/mdstat Personalities : [raid0] [raid5] read_ahead 1024 sectors md2 : active raid5 [dev 07:02][2] [dev 07:01][1] [dev 07:00][0] 307008 blocks level 5, 4k chunk, algorithm 2 [4/3] [UUU_] with persistent-superblock = 0, i got various errors while try to start raid arrays (loop devices, hard disks): arrays starts without one disk, arrays does not start: it can't read superblock on disk0, arrays does not start: SIGIO failed... with persistent-superblock = 1 works more fine. -- WBR, MaxiM mailto:[EMAIL PROTECTED] CJSC Interdnestrcom Tiraspol, Moldova www.idknet.com, www.isp.idknet.com