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On 01/24/13 05:02, Michael Haubenwallner wrote: |
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> |
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> I've recently upgraded some server from kernel-2.6.28 to kernel-3.5.7 and |
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> encountered that the root-device was renamed from /dev/cciss/c0d0p1 to |
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> /dev/sda1 due to some kernel driver change (took me a while to find out). |
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> I'm not using genkernel or any initramfs, nor do I have separate /usr. |
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> |
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> The only way I've found to keep the system bootable with both kernels |
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> (for the upgrade process until the new kernel config was good enough) |
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> was to replace /dev/cciss/c0d0p1 by /dev/root in /etc/fstab. |
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> |
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> How would this be done when there is no /dev/root any more? |
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> |
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These are the Compaq SmartArray controllers (usually found in HP |
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Proliants). They used to have their own block driver, but these days |
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they're just grouped with the rest of the SCSI drives. |
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The old driver: |
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Block Devices -> BLK_CPQ_CISS_DA |
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The new one is under, |
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SCSI device support -> SCSI low-level drivers -> SCSI_HPSA |
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This driver supports HP Smart Array Controllers (circa 2009). |
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It is a SCSI alternative to the cciss driver, which is a block |
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driver. Anyone wishing to use HP Smart Array controllers who |
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would prefer the devices be presented to linux as SCSI devices, |
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rather than as generic block devices should say Y here. |
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The HPSA driver does *not* work on older Proliants, so I can only assume |
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that HPSA is receiving active maintenance while the old block driver is |
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not. Nevertheless, if the block driver worked for you in an old kernel, |
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you could simply disable HPSA on the new one. |
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When the time comes that you need to boot two newish kernels, you can |
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re-enable HPSA and update fstab to use the new name. |
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