On 2/26/21 1:19 AM, Forza wrote: > > > ---- From: michael.christie@xxxxxxxxxx -- Sent: 2021-02-26 - 04:41 ---- > >> On 2/25/21 3:36 PM, Forza wrote: >>> Hi, >>> >>> I have a weird issue with using a file as backing store with a Win2016 server as initiator. >>> >>> Very often if I reboot the Linux server the disk image becomes corrupt so that Windows cannot even detect the gpt partition table on it. It can happen even if I shut down the Windows machine before I reboot the Linux server. >>> >>> Initially I thought I would be write cache. But I've disabled that with no benefit to this problem. >>> >> >> How are you disabling the write cache? What tools do you use? Is >> it targetcli or are you doing this manually via configfs? > > I am using targetcli, using the documentation https://urldefense.com/v3/__http://linux-iscsi.org/Doc/LIO*20Admin*20Manual.pdf__;JSU!!GqivPVa7Brio!OYNbrN3Fseq8PE_-n67Mmb8_JdUUU_yWw_LcbeKvyKgKgP_iVH-X2u1vrU9RasK-Nvhz$ > I created the backstore/fileio with write_back=false but this might not have disabled cache sinze I see in the saveconfig.json that it is still set to true. So I guess this can still be an issue =( > > >> >> What is the output of >> >> cat /sys/kernel/config/target/core/fileio_$N/$name/info > > Status: ACTIVATED Max Queue Depth: 128 SectorSize: 512 HwMaxSectors: 16384 > TCM FILEIO ID: 0 File: /media/iscsi-tgt/dx_media_3.img Size: 429496729600 Mode: Buffered-WCE Async: 0 > I think you need to ask the people that maintain your tools (fedora or upstream https://github.com/open-iscsi/targetcli-fb), because for upstream's master branch it looks like doing write_back=false should work, but above we see "Mode: Buffered-WCE" and below we see emulate_write_cache=1 kike you mentioned. > >> cat /sys/kernel/config/target/core/fileio_$N/$name/attrib/write_cache > > This does not exist. The curent files are: > Sorry, I meant emulate_write_cache. > # grep . * > alua_support:1 > block_size:512 > emulate_3pc:1 > emulate_caw:1 > emulate_dpo:1 > emulate_fua_read:1 > emulate_fua_write:1 > emulate_model_alias:1 > emulate_pr:1 > emulate_rest_reord:0 > emulate_tas:1 > emulate_tpu:0 > emulate_tpws:0 > emulate_ua_intlck_ctrl:0 > emulate_write_cache:1 > enforce_pr_isids:1 > force_pr_aptpl:0 > hw_block_size:512 > hw_max_sectors:16384 > hw_pi_prot_type:0 > hw_queue_depth:128 > is_nonrot:0 > max_unmap_block_desc_count:1 > max_unmap_lba_count:8192 > max_write_same_len:4096 > optimal_sectors:16384 > pgr_support:1 > pi_prot_format:0 > pi_prot_type:0 > pi_prot_verify:0 > queue_depth:128 > unmap_granularity:1 > unmap_granularity_alignment:0 > unmap_zeroes_data:0
