Re: Hardware Raid + hot-replace failed disk
Pieter Donche wrote: Suppose you have a system with multiple disks managed by a hardware RAID controller in a RAID5 of RAID6 configuration, To FreeBSD it will look like e.g. a single large drive. If you want to extend your disk space by plugging in an extra disk, the hardware RAID controller will probably detect it and add it in his management, but will it be seen by FreeBSD? How can you make the added disk-space available for FreeBSD. Can this be done without shutting down the system? How?? I think this would be possible using vinum, but I've never tested it. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Hardware Raid + hot-replace failed disk
On Thu, 6 Nov 2008, Wojciech Puchar wrote: Suppose you have a system with multiple disks managed by a hardware RAID controller in a RAID5 of RAID6 configuration, To FreeBSD it will look like e.g. a single large drive. what is RAID5 of RAID6??? RAID5 or RAID6 (sorry, typing error) If you want to extend your disk space by plugging in an extra disk, the hardware RAID controller will probably detect it and add it in his management, but will it be seen by FreeBSD? FreeBSD will see larger drive. With what command can you see that FreeBSD had 'seen' it ? Or is the the bsdlabel command? Is bsdlabel a partition management program (such as GParted, Partition Magic)? you then have to fix partition table (use bsdlabel -e) fix c partition to be actually sized of whole drive, and then a) add new partition(s) for new space b) extend the size of last partition and use growfs I guess here you mean 2 alternatives: a) using the new space for new partition(s) leaving the existing as they are or b) create no new partitions but extend the last partition to include the new space, by using the growfs command ? How can you make the added disk-space available for FreeBSD. Can this be done without shutting down the system? How?? i don't think FreeBSD can be told to reget device info from controller when partitions of that device are mounted. but i may be wrong Hmm, man growfs says: Currently growfs CAN ONLY ENLARGE UNMOUNTED FILE SYSTEMS. DO NOT TRY ENLARGING A MOUNTED FILE SYSTEM, YOUR SYSTEM WILL PANIC AND YOU WILL NOT BE ABLE TO USE THE FILE SYSTEM ANY LONGER. If your FreeDSB only has swap and a / file system (with all users inside /usr/home) or you set up FreeBSD with a swap, /, /var and /usr filesystems (with users in /usr/home) and you want to grow a file system (e.g. /usr to give the extra space to users) (scenario b)) then, I guess, you will need to go into single-user mode and boot from CD with a FreeBSD in RAM to be able extend the (unmounted) file system /usr Can scenario a) (making new file system for new space) be done in multi-user mode, or only in single-user mode, will it need a reboot ?? Is there any document (besides the manual pages bsdlabel, growfs, ..) that describes step-by-step what to do to grow an existing file system of to add a new file system on newly added disk space ? Pieter ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Hardware Raid + hot-replace failed disk
On Fri, Nov 07, 2008 at 10:35:39AM +0100, Pieter Donche wrote: On Thu, 6 Nov 2008, Wojciech Puchar wrote: Suppose you have a system with multiple disks managed by a hardware RAID controller in a RAID5 of RAID6 configuration, To FreeBSD it will look like e.g. a single large drive. what is RAID5 of RAID6??? RAID5 or RAID6 (sorry, typing error) If you want to extend your disk space by plugging in an extra disk, the hardware RAID controller will probably detect it and add it in his management, but will it be seen by FreeBSD? FreeBSD will see larger drive. With what command can you see that FreeBSD had 'seen' it ? The answer is: it depends. The below applies to SATA, SAS, and SCSI only; you cannot hot-swap PATA disks. If you have a hot-swap enclosure or a hot-swap backplane, and are using a hardware RAID controller (and I do mean *real* hardware RAID, not BIOS-level RAID like Intel MatrixRAID or Adaptec HostRAID), then the FreeBSD controller driver should report the disk falling off the bus (if a disk is removed), or a disk appearing on the bus (if a disk is added). If the driver does not handle this natively, you will have to rely on command-line utilities from the RAID card vendor to manage this. If you have a hot-swap enclosure or a hot-swap backplane, and are using software/OS-based RAID (such as gvinum, ccd, or ZFS), then it depends on the underlying type of disk you're using. With SATA disks, you rely on the FreeBSD ata(4) layer. You are at the whim of the ata(4) layer and its support for your motherboard chipset, assuming that's what you're using (there are exceptions; see below). Removal of a SATA disk should show the disk falling off the bus, and you will need to perform atacontrol detach channel to ensure the kernel knows the disk has been removed (this is not done automatically, despite what you see on the console; I recommend you do the detach prior to disk removal). Addition of a SATA disk will require you to perform atacontrol attach channel, and hopefully you will see the disk make and model show up moments later. With SCSI or SAS disks, you rely on the FreeBSD da(4) layer, backed by the FreeBSD CAM(4) layer. This layer is proven reliable, and even some SATA RAID controllers use it (such as Areca controllers; yes, they're SATA disks on a hardware RAID controller, but the FreeBSD driver for the Areca card uses da(4) and CAM(4)). Removal of a SCSI disk should show the disk falling off the bus. You can use camcontrol to examine the state of things; you may need to use start/stop (it's been a while since I've used camcontrol). Addition of a SCSI disk might require camcontrol rescan; again, it's been a while since I've used camcontrol. In general, there is no easy way to describe every single scenario under the sun. It greatly depends upon what hardware you're using, and what kind of disk you're using. If you choose to use a hardware RAID card, the card user manual should describe *exactly* how to accomplish additions and removals. Chances are you're talking about generic SATA disks hooked up to your generic motherboard. You should be aware that FreeBSD is somewhat flaky in this regard. I've recently written about a disk swap gone bad (while using a Promise TX4310 controller), which should give you some idea of the chaos that can happen as a result of shoddy driver support: http://wiki.freebsd.org/JeremyChadwick/ZFS_disk_upgrade_gone_bad This article is followed-up by a fully-working example when using an Intel ICH-based board with Intel AHCI enabled (meaning, everything worked flawlessly and exactly how it should've): http://wiki.freebsd.org/JeremyChadwick/ZFS_disk_upgrade_gone_bad_part_2 I'm still in the process of writing the details that make up Part 2. Or is the the bsdlabel command? bsdlabel(8) is what creates filesystems. To format filesystems, you use newfs(8). Is bsdlabel a partition management program (such as GParted, Partition Magic)? No, that's fdisk(8). FreeBSD calls these slices, not partitions, but they're the same thing. If you want to keep it simple, I recommend you use sade(8), which is the text-based interface for partitioning and filesystem creation that you see when you install FreeBSD. If you don't have the sade command, just run sysinstall and choose post-configuration. Is there any document (besides the manual pages bsdlabel, growfs, ..) that describes step-by-step what to do to grow an existing file system of to add a new file system on newly added disk space ? What everyone else is telling you is sending you on a wild goose chase. I'm sitting here imagining you clicking your mouse at 6000 clicks per second, eyeballs rolling around, sweating profusely. :-) I wish FreeBSD mailing list people wouldn't do this to new folks, because all it's doing is confusing you. The simple answer is this: on FreeBSD, there is not a reliable way to grow an existing filesystem without taking the machine down, bringing it into single-user,
Hardware Raid + hot-replace failed disk
Suppose you have a system with multiple disks managed by a hardware RAID controller in a RAID5 of RAID6 configuration, To FreeBSD it will look like e.g. a single large drive. If you want to extend your disk space by plugging in an extra disk, the hardware RAID controller will probably detect it and add it in his management, but will it be seen by FreeBSD? How can you make the added disk-space available for FreeBSD. Can this be done without shutting down the system? How?? ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Hardware Raid + hot-replace failed disk
Suppose you have a system with multiple disks managed by a hardware RAID controller in a RAID5 of RAID6 configuration, what is RAID5 of RAID6??? To FreeBSD it will look like e.g. a single large drive. If you want to extend your disk space by plugging in an extra disk, the hardware RAID controller will probably detect it and add it in his management, but will it be seen by FreeBSD? FreeBSD will see larger drive. you then have to fix partition table (use bsdlabel -e) fix c partition to be actually sized of whole drive, and then a) add new partition(s) for new space b) extend the size of last partition and use growfs How can you make the added disk-space available for FreeBSD. Can this be done without shutting down the system? How?? i don't think FreeBSD can be told to reget device info from controller when partitions of that device are mounted. but i may be wrong ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Hardware Raid + hot-replace failed disk
On Thursday 06 November 2008 22:01:39 Wojciech Puchar wrote: Suppose you have a system with multiple disks managed by a hardware RAID controller in a RAID5 of RAID6 configuration, what is RAID5 of RAID6??? 'of' is 'or' in dutch, common typo for dutch or flemish people. -- Mel Problem with today's modular software: they start with the modules and never get to the software part. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Hardware Raid + hot-replace failed disk
On Thursday 06 November 2008 22:01:39 Wojciech Puchar wrote: Suppose you have a system with multiple disks managed by a hardware RAID controller in a RAID5 of RAID6 configuration, what is RAID5 of RAID6??? 'of' is 'or' in dutch, common typo for dutch or flemish people. For Americans also, due to f and r being adjacent on a US-English keyboard. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
