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#longhorn-storage
Title
# longhorn-storage
c

crooked-cat-21365

02/06/2023, 11:35 AM
Hi folks, what is the recommendation for setting node.session.timeo.replacement_timeout in /etc/iscsi/iscsid.conf? The default is 120 secs, but my Dell servers usually take at least 5 minutes for rebooting, so this setting doesn't seem reasonable.
n

narrow-egg-98197

02/07/2023, 4:08 AM
Can you check
/var/log/messages
to see how long the iSCSI initiator waits to find an iSCSI target? And I also think that if you extend the value of
node.session.timeo.replacement_timeout
, you should consider reducing the value of
node.conn[0].timeo.noop_out_interval
and
node.conn[0].timeo.noop_out_timeout
to prevent if any network Problem Blocking I/O for too long.
c

crooked-cat-21365

02/07/2023, 8:10 AM
Do you have any guidelines about the recommended iscsi config settings for Longhorn on the target? I get I/O errors, if I have to reboot a node, eg.
Copy code
Feb  6 15:03:08 srvl034b kernel: [268863.547051] blk_update_request: I/O error, dev sdc, sector 0 op 0x1:(WRITE) flags 0x800 phys_seg 0 prio class 0
Feb  6 15:03:08 srvl034b kernel: [268863.578677] sd 14:0:0:1: [sdc] Synchronizing SCSI cache
Feb  6 15:03:08 srvl034b kernel: [268863.662050] Buffer I/O error on dev sdc, logical block 3178496, lost sync page write
Feb  6 15:03:08 srvl034b kernel: [268863.680275] JBD2: Error -5 detected when updating journal superblock for sdc-8.
Feb  6 15:03:08 srvl034b kernel: [268863.696543] Aborting journal on device sdc-8.
Feb  6 15:03:08 srvl034b kernel: [268863.709930] Buffer I/O error on dev sdc, logical block 3178496, lost sync page write
Feb  6 15:03:08 srvl034b kernel: [268863.728709] JBD2: Error -5 detected when updating journal superblock for sdc-8.
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