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authorLinus Torvalds <torvalds@linux-foundation.org>2011-05-25 09:15:35 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-25 09:15:35 -0700
commit929cfdd5d3bdc772aff32e5a3fb4e3894394aa75 (patch)
treef67202d079eaf1f8d65b2e1bfac70b768ae34bc4 /Documentation
parent798ce8f1cca29dcc3f4b55947f611f4ffb32ac2b (diff)
parenta1c15c59feee36267c43142a41152fbf7402afb6 (diff)
Merge branch 'for-2.6.40/drivers' of git://git.kernel.dk/linux-2.6-block
* 'for-2.6.40/drivers' of git://git.kernel.dk/linux-2.6-block: (110 commits) loop: handle on-demand devices correctly loop: limit 'max_part' module param to DISK_MAX_PARTS drbd: fix warning drbd: fix warning drbd: Fix spelling drbd: fix schedule in atomic drbd: Take a more conservative approach when deciding max_bio_size drbd: Fixed state transitions after async outdate-peer-handler returned drbd: Disallow the peer_disk_state to be D_OUTDATED while connected drbd: Fix for the connection problems on high latency links drbd: fix potential activity log refcount imbalance in error path drbd: Only downgrade the disk state in case of disk failures drbd: fix disconnect/reconnect loop, if ping-timeout == ping-int drbd: fix potential distributed deadlock lru_cache.h: fix comments referring to ts_ instead of lc_ drbd: Fix for application IO with the on-io-error=pass-on policy xen/p2m: Add EXPORT_SYMBOL_GPL to the M2P override functions. xen/p2m/m2p/gnttab: Support GNTMAP_host_map in the M2P override. xen/blkback: don't fail empty barrier requests xen/blkback: fix xenbus_transaction_start() hang caused by double xenbus_transaction_end() ...
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/blockdev/cciss.txt15
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/blockdev/cciss.txt b/Documentation/blockdev/cciss.txt
index 89698e8df7d4..c00c6a5ab21f 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