[CentOS] Correct way to change I/O scheduler in a iSCSI dev

Santi Saez santi at usansolo.net
Tue Nov 25 12:09:55 UTC 2008


What's the correct way to change configuration parameters for an iSCSI
device? For example I/O scheduler, max_sectors_kb, etc...

I could add commands to the S99local script:

  echo noop > /sys/block/sdb/queue/scheduler
  echo 64 > /sys/block/sdb/queue/max_hw_sectors_kb

Unfortunately, iSCSI device names might change from sdb to, say, sdc
(server reboot, iSCSI target reconnection). If this happens, customizations
would be lost or applied to a different device.

Any workaround for this using centOS? sysctl, udev, anything else? It also
may be applied to Fiber Channel devices..


Santi Saez

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