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| author | Florian Tobias Schandinat <FlorianSchandinat@gmx.de> | 2011-08-17 16:14:01 +0000 |
|---|---|---|
| committer | Florian Tobias Schandinat <FlorianSchandinat@gmx.de> | 2011-08-17 16:14:01 +0000 |
| commit | 94bd217e2d683719ab21a4ac117d8a1b91cbedc9 (patch) | |
| tree | f2d506818cc1643ca816f609518ab5d1cdb28e66 /Documentation/blockdev/cciss.txt | |
| parent | 5dd72f12df00cbabc16de770b79b17ced63138be (diff) | |
| parent | 93ee7a9340d64f20295aacc3fb6a22b759323280 (diff) | |
Merge commit 'v3.1-rc2' into HEAD
Diffstat (limited to 'Documentation/blockdev/cciss.txt')
| -rw-r--r-- | Documentation/blockdev/cciss.txt | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/blockdev/cciss.txt b/Documentation/blockdev/cciss.txt index 89698e8df7d..c00c6a5ab21 100644 --- a/Documentation/blockdev/cciss.txt +++ b/Documentation/blockdev/cciss.txt @@ -169,3 +169,18 @@ is issued which positions the tape to a known position. Typically you must rewind the tape (by issuing "mt -f /dev/st0 rewind" for example) before i/o can proceed again to a tape drive which was reset. +There is a cciss_tape_cmds module parameter which can be used to make cciss +allocate more commands for use by tape drives. Ordinarily only a few commands +(6) are allocated for tape drives because tape drives are slow and +infrequently used and the primary purpose of Smart Array controllers is to +act as a RAID controller for disk drives, so the vast majority of commands +are allocated for disk devices. However, if you have more than a few tape +drives attached to a smart array, the default number of commands may not be +enought (for example, if you have 8 tape drives, you could only rewind 6 +at one time with the default number of commands.) The cciss_tape_cmds module +parameter allows more commands (up to 16 more) to be allocated for use by +tape drives. For example: + + insmod cciss.ko cciss_tape_cmds=16 + +Or, as a kernel boot parameter passed in via grub: cciss.cciss_tape_cmds=8 |