|
|
| Line 14: |
Line 14: |
| | | | |
| | Currently, using plain libvirt seems to fit most of our needs. | | Currently, using plain libvirt seems to fit most of our needs. |
| − |
| |
| − | === Installing Debian on blade 13 and 14 with Fiber Channel ===
| |
| − |
| |
| − | This is a quick note to record a recent quirk. Although FC support on Debian works fine, using the multipath-tools-boot package is a bit tricky. It will update the initrd to include the multipath libraries and tools, to make it available at boot time.
| |
| − |
| |
| − | This happened on blade-13; on reboot it was unable to mount the root partition (The message was 'device or resource busy') because the device mapper had somehow taken hold of the SCSI disk. By changing the root=UUID=xxxx stanza in the GRUB menu to root=/dev/dm-2 (this was guess-work) I managed to boot the system. There were probably several remedies to resolve the issue:
| |
| − | # rerun update-grub. This should replace the UUID= with a link to /dev/mapper/xxxx-part1
| |
| − | # blacklist the disk in the device mapper (and running mkinitramfs)
| |
| − | # remove the multipath-tools-boot package altogether.
| |
| − |
| |
| − | I opted for blacklisting; this is what's in /etc/multipath.conf:
| |
| − | blacklist {
| |
| − | wwid 3600508e000000000d6c6de44c0416105
| |
| − | }
| |
| − |
| |
| − |
| |
| − | ==== A bonnie test of a VM with disk on local disk vs. a VM with disk on FC: ====
| |
| − |
| |
| − | * lofarwn.testbed had its disk locally
| |
| − | Version 1.03e ------Sequential Output------ --Sequential Input- --Random-
| |
| − | -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
| |
| − | Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
| |
| − | lofarwn 4G 20869 35 30172 5 23198 6 45957 85 510971 84 +++++ +++
| |
| − | ------Sequential Create------ --------Random Create--------
| |
| − | -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
| |
| − | files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
| |
| − | 16 16759 99 +++++ +++ +++++ +++ 16810 100 +++++ +++ +++++ +++
| |
| − | lofarwn,4G,20869,35,30172,5,23198,6,45957,85,510971,84,+++++,+++,16,16759,99,+++++,+++,+++++,+++,16810,100,+++++,+++,+++++,+++
| |
| − | * ige-cert.testbed has disk on LVM via FC.
| |
| − | Version 1.03e ------Sequential Output------ --Sequential Input- --Random-
| |
| − | -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
| |
| − | Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
| |
| − | ige-cert 4G 53384 96 216611 37 102283 24 51060 95 689474 79 +++++ +++
| |
| − | ------Sequential Create------ --------Random Create--------
| |
| − | -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
| |
| − | files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
| |
| − | 16 12676 100 +++++ +++ +++++ +++ 12761 99 +++++ +++ +++++ +++
| |
| − | ige-cert,4G,53384,96,216611,37,102283,24,51060,95,689474,79,+++++,+++,16,12676,100,+++++,+++,+++++,+++,12761,99,+++++,+++,+++++,+++
| |
