On Mon, Nov 28, 2011 at 3:46 PM, Moger, Babu wrote: >> 3) Based on messages during failover, is it true that I can avoid >> explicitly put scsi_dh in initrd? >> If I create initrd this way: >> mkinitrd /boot/initrd-$(uname -r)-scsi_dh.img $(uname -r) -- >> preload=scsi_dh_rdac >> I get this difference: >> [root@testserver ~]# diff /tmp/new/init /tmp/current/init >> 44,51d43 >> < echo "Loading scsi_mod.ko module" >> < insmod /lib/scsi_mod.ko >> < echo "Loading sd_mod.ko module" >> < insmod /lib/sd_mod.ko >> < echo "Loading scsi_dh.ko module" >> < insmod /lib/scsi_dh.ko >> < echo "Loading scsi_dh_rdac.ko module" >> < insmod /lib/scsi_dh_rdac.ko >> 62a55,58 >> > echo "Loading scsi_mod.ko module" >> > insmod /lib/scsi_mod.ko >> > echo "Loading sd_mod.ko module" >> > insmod /lib/sd_mod.ko >> >> or will it help in any way? > > Having scsi_dh_rdac in initrd will help to get rid of the initial I/O errors you are seeing. > Actually not.... see screen shots of console start at https://docs.google.com/open?id=0BwoPbcrMv8mvMWRlYmVhM2MtY2JkYi00ZDMzLWIxMWMtMDM0YzZjMWU0NGE1 and https://docs.google.com/open?id=0BwoPbcrMv8mvM2RjMDg1MWUtYzVmZC00OTA1LTljNjAtZGZmMjM5NDlhYTI4 and also dmesg giving for example for sdb and sdc: scsi 3:0:0:1: rdac: LUN 1 (unowned) sdb : very big device. try to use READ CAPACITY(16). SCSI device sdb: 7320494080 512-byte hdwr sectors (3748093 MB) sdb: Write Protect is off sdb: Mode Sense: 77 00 10 08 SCSI device sdb: drive cache: write back w/ FUA sdb : very big device. try to use READ CAPACITY(16). SCSI device sdb: 7320494080 512-byte hdwr sectors (3748093 MB) sdb: Write Protect is off sdb: Mode Sense: 77 00 10 08 SCSI device sdb: drive cache: write back w/ FUA sdb:<3>Buffer I/O error on device sdb, logical block 0 Buffer I/O error on device sdb, logical block 0 Buffer I/O error on device sdb, logical block 0 Buffer I/O error on device sdb, logical block 0 Buffer I/O error on device sdb, logical block 0 Buffer I/O error on device sdb, logical block 0 Buffer I/O error on device sdb, logical block 0 Dev sdb: unable to read RDB block 0 Buffer I/O error on device sdb, logical block 0 Buffer I/O error on device sdb, logical block 0 unable to read partition table sd 3:0:0:1: Attached scsi disk sdb Vendor: IBM Model: 1814 FAStT Rev: 0916 Type: Direct-Access ANSI SCSI revision: 05 scsi 3:0:1:1: rdac: LUN 1 (owned) scsi 3:0:1:1: rdac: LUN 1 (owned) sdc : very big device. try to use READ CAPACITY(16). SCSI device sdc: 7320494080 512-byte hdwr sectors (3748093 MB) sdc: Write Protect is off sdc: Mode Sense: 77 00 10 08 SCSI device sdc: drive cache: write back w/ FUA sdc : very big device. try to use READ CAPACITY(16). SCSI device sdc: 7320494080 512-byte hdwr sectors (3748093 MB) sdc: Write Protect is off sdc: Mode Sense: 77 00 10 08 SCSI device sdc: drive cache: write back w/ FUA sdc: unknown partition table sd 3:0:1:1: Attached scsi disk sdc ... GSI 23 sharing vector 0x72 and IRQ 23 ACPI: PCI Interrupt 0000:04:00.0[A] -> GSI 17 (level, low) -> IRQ 114 eth0: Broadcom NetXtreme II BCM5708 1000Base-SX (B2) PCI-X 64-bit 133MHz found at mem da000000, IRQ 114, node addr 00215e2fd0e2 ACPI: PCI Interrupt 0000:06:00.0[A] -> GSI 19 (level, low) -> IRQ 90 eth1: Broadcom NetXtreme II BCM5708 1000Base-SX (B2) PCI-X 64-bit 133MHz found at mem d8000000, IRQ 90, node addr 00215e2fd0e4 printk: 69 messages suppressed. Buffer I/O error on device sdb, logical block 0 ... md: Autodetecting RAID arrays. md: autorun ... md: ... autorun DONE. device-mapper: multipath: version 1.0.6 loaded device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management. device-mapper: multipath round-robin: version 1.0.0 loaded printk: 4 messages suppressed. Buffer I/O error on device sdb, logical block 915061759 ... So if I have to get yet the I/O errors, having no advantage, I'd prefer to stay stick with the default initrd... -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
