increase SD_STATS ?

Hi,

Due to SD_STATS=256 (/drivers/scsi/sd.c)
there's a limit on the max /dev/sd devices.

Now, we have a large FC fabric, with more than 3500 LUNs... => Of course, we have an Oops when an HBA is connected to the fabric (still sd.c, BUG in function sd_iostats_bump when sd>SD_STATS)

What (bad) side-effects can be expected if we increase SD_STATS (4096 should be nice, may be 8192) ?

From you description it looks like you are using some odd 2.4.x vendor

Quoted 6 lines · Frederic TEMPORELLI

Hi,

Due to SD_STATS=256 (/drivers/scsi/sd.c)
there's a limit on the max /dev/sd devices.

Quoted 8 lines

Now, we have a large FC fabric, with more than 3500 LUNs... => Of course, we have an Oops when an HBA is connected to the fabric (still sd.c, BUG in function sd_iostats_bump when sd>SD_STATS)

What (bad) side-effects can be expected if we increase SD_STATS (4096 should be nice, may be 8192) ?

From you description it looks like you are using some odd 2.4.x vendor

tree. Just upgrade to latest 2.6 and these limitations will go away.

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